CN113880155A - Online low-pressure boiler water quality adjusting method - Google Patents
Online low-pressure boiler water quality adjusting method Download PDFInfo
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- CN113880155A CN113880155A CN202111184258.8A CN202111184258A CN113880155A CN 113880155 A CN113880155 A CN 113880155A CN 202111184258 A CN202111184258 A CN 202111184258A CN 113880155 A CN113880155 A CN 113880155A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 22
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 166
- 239000010452 phosphate Substances 0.000 claims abstract description 129
- 238000007620 mathematical function Methods 0.000 claims abstract description 57
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 35
- 239000011734 sodium Substances 0.000 claims abstract description 26
- 229910000406 trisodium phosphate Inorganic materials 0.000 claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 claims abstract description 13
- HEAFLBOWLRRIHV-UHFFFAOYSA-N [Na].[P] Chemical compound [Na].[P] HEAFLBOWLRRIHV-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000007423 decrease Effects 0.000 claims description 36
- 230000003247 decreasing effect Effects 0.000 claims description 32
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 17
- 238000012886 linear function Methods 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 16
- 230000008020 evaporation Effects 0.000 claims description 11
- 238000001704 evaporation Methods 0.000 claims description 11
- 239000010865 sewage Substances 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- 239000011574 phosphorus Substances 0.000 claims description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 230000007062 hydrolysis Effects 0.000 claims description 4
- 238000006460 hydrolysis reaction Methods 0.000 claims description 4
- 229910001415 sodium ion Inorganic materials 0.000 claims description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 7
- 239000010802 sludge Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 238000012797 qualification Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/18—PO4-P
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
The invention discloses a method for online regulating the quality of boiler water of a low-pressure boiler, which comprises the following steps: (1) establishing a mathematical function model of the phosphate radical concentration at the time t by adopting a continuous coordination phosphate treatment mode for furnace water, and calculating the phosphate radical concentration C at the time t; (2) establishing a mathematical function model of the sodium-phosphorus molar ratio R, and calculating the value of the furnace water R at the time t; (3) establishing time t Na3PO4Adding amount mathematical function model, calculating furnace water Na at t moment3PO4Adding amount; (4) establishing NaH at time t2PO4Adding amount mathematical function model, resolving furnace water NaH at t moment2PO4Adding the amount. The furnace water is regulated through the phosphate radical concentration C, the R value of the furnace water and the adding amount of phosphate, so that the water quality of the furnace water is regulated, the phosphate radical, the pH value and the R value in the furnace water are ensured to be within index ranges, and the phenomena of corrosion of free sodium hydroxide and hiding of phosphate are prevented.
Description
Technical Field
The invention belongs to the field of water treatment, and particularly relates to an online regulating method for the quality of boiler water of a low-pressure boiler.
Background
In the operation process of some low-pressure boilers, working conditions are changed frequently, the stability of the quality of boiler water is poor, the qualification rate of the quality index of the boiler water is difficult to ensure by a traditional phosphate coordination method for offline detection and intermittent adjustment, so that the content of free alkali and sludge in the boiler is high, the boiler is corroded to different degrees, the safe operation of the system is seriously influenced, and an online water quality adjusting method is urgently needed to improve the qualification rate of the quality index of the boiler water. However, due to the restriction of the phosphate online detection technology, the phosphorus meter online detection value is delayed by 5-15 minutes, the working conditions of certain low-pressure boilers are changed frequently, the stability of the boiler water quality is poor, and the existing phosphate online detection technology is directly applied to the low-pressure boilers, so that the qualified rate of the boiler water quality index is difficult to improve. In order to improve the qualified rate of boiler water indexes, reduce the content of free alkali and sludge in the boiler and ensure the safe operation of a system, a boiler water quality online adjusting method which is suitable for the existing detection technology and is suitable for the low-pressure boiler is urgently needed.
Disclosure of Invention
The invention aims to provide an on-line regulating method for the boiler water quality of a low-pressure boiler, which aims to solve the problems in the background art, is suitable for regulating the boiler water quality of the low-pressure boiler with frequent working condition change and poor boiler water quality stability, and can effectively improve the boiler water index qualification rate.
The technical scheme adopted for achieving the aim is that the method for adjusting the boiler water quality of the low-pressure boiler on line comprises the following steps:
(1) furnace water adopts a continuous coordination phosphate treatment mode, a mathematical function model of the phosphate radical concentration at the time t is established, and the phosphate radical concentration C at the time t is calculated: establishing a mathematical function model of the phosphate radical concentration at the time t according to the evaporation capacity, the sewage discharge capacity, the initial phosphate radical concentration, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the operation time of the steam system, inputting the evaporation capacity, the sewage discharge capacity, the phosphate radical, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the operation time of the system at the time t, and calculating the phosphate radical concentration C at the time t;
(2) establishing a mathematical function model of the sodium-phosphorus molar ratio R, and resolving the furnace water R value at the time t: establishing a mathematical function model of the sodium-phosphorus molar ratio R according to the pH value and the phosphate radical concentration C, inputting the pH value and the phosphate radical concentration at the time t, and calculating the R value of the furnace water at the time t;
(3) establishing time t Na3PO4Adding amount mathematical function model, calculating furnace water Na at t moment3PO4Adding amount: according to the phosphate radical of the steam system, the control point phosphate radical, the furnace water R, the control points R and Na3PO4Solution concentration, establishing time t Na3PO4Adding amount mathematical function model, inputting the concentration of phosphate radical at t moment, the phosphate radical at control point, the furnace water R at t moment, the control points R and Na in the system3PO4Solution concentration, calculating furnace water Na at t moment3PO4Adding amount;
(4) establishing NaH at time t2PO4Adding amount mathematical function model, resolving furnace water NaH at t moment2PO4Adding amount: according to the phosphate radical of the steam system, the control point phosphate radical, the furnace water R, the control point R and the NaH2PO4Concentration of solution, establishment of NaH at time t2PO4A mathematical function model of the adding amount is input into the system, namely the concentration of phosphate radical at the t moment, the phosphate radical at a control point, furnace water R at the t moment, the control point R and NaH2PO4Solution concentration, calculating furnace water NaH at t moment2PO4The adding amount of the furnace water is adjusted through the phosphate radical concentration, the R and the phosphate adding amount, so that the water quality of the furnace water is adjusted.
Further, the expression of the mathematical function model of the phosphate radical concentration at the time t in the step (1) is as follows:
in the formula:
f1(p,W,u,H,Q,C0) -a function;
f2(p,W,u,V0) -a function;
f3(p, W, u, H, Q) -function;
c0 — phosphate concentration at start;
phosphate radical concentration at time C-t;
t-time elapsed from C0 to C;
v0-volume of furnace water;
h-feed water hardness;
q is water supply flow;
p is the sewage discharge capacity;
u-steam humidity;
w is the evaporation capacity.
Further, the function f1(p,W,u,H,Q,C0) Is related to p, W, u, H, Q, C0Linear function of p, W, u, H, Q, C0Increase and decrease and increase; the function f2(p,W,u,V0) Is related to p, W, u, V0Function of f2(p,W,u,V0) Is a linear function of p, W, u, decreasing with increasing p, W, u, increasing with decreasing f2(p,W,u,V0) Is V0Inverse proportional function with V0Increase and decrease and increase; the function f3(p, W, u, H, Q) is a function of p, W, u, H, Q, f3(p, W, u, H, Q) is a complex function of p, W, u, increasing with increasing p, W, u and decreasing with decreasing f3(p, W, u, H, Q) is a proportional function of H, Q that decreases with increasing H, Q and increases with decreasing H, Q.
Further, the pH value in the step (2) is a furnace water pH value detection value and is generated by phosphate hydrolysis, and the range is as follows: the pH value is more than or equal to 9 and less than or equal to 11.
Further, in the step (2), the molar ratio of sodium to phosphorus R is the ratio of hydrolyzed sodium ions to phosphate of phosphate, and the range is as follows: the pH value is more than or equal to 2 and less than or equal to 3; the R value is obtained by resolving a mathematical function model of the R value and the furnace water phosphate concentration C, pH value at the time t, and the mathematical function model expression of the R value is as follows:
R＝f4(pH，C)
wherein the R value is an exponential function of the pH value, and the R value increases along with the increase of the pH value and decreases along with the decrease of the pH value; the value of R is a hyperbolic function of the phosphate concentration C at time t, and the value of R decreases with increasing value of C and increases with decreasing value.
Further, Na in the step (3)3PO4Is 1% >, up to10% of a separate aqueous solution, the amount of which is added of Na3PO4Adding amount G, furnace water R at time t and sodium-phosphorus molar ratio R of control pointControlPhosphate radical concentration C at time t and phosphate radical concentration C at control pointControlResolving a mathematical function model to obtain; na (Na)3PO4The mathematical function model expression of the added quantity G is as follows:
wherein G and R, RControl、C、CControlIn a linear function relationship with G value as a function of RControl、CControlThe value increases and decreases, and the value of G decreases and increases as the value of R, C increases.
Further, NaH in the step (4)2PO4The independent aqueous solution with the concentration of 1 to 10 percent is added with NaH2PO4Amount of addition G1The molar ratio R of the furnace water R and the control point sodium to the phosphorus at the time tControlPhosphate radical concentration C at time t and phosphate radical concentration C at control pointControlResolving a mathematical function model to obtain; NaH2PO4Amount of addition G1The mathematical function model of (2) is expressed as follows:
in the formula G1And R, RControl、C、CControlIn a linear function relationship of one degree, G1Value following RControlC value is increased and decreased, and G value is increased with R, CControlThe value increases and decreases.
Advantageous effects
Compared with the prior art, the invention has the following advantages.
1. The invention implements on-line adjustment to the quality of the furnace water, controls the deviation of the quality of the furnace water, and tests show that the qualified rate of the quality index of the furnace water can be effectively improved;
2. the method accurately calculates the concentration of phosphate radical in the boiler water at the time t, controls the content of free sodium hydroxide in the boiler water, effectively prevents the occurrence of the free alkali corrosion perforation phenomenon of a boiler heat transfer pipe, and ensures the safe operation of the system;
3. the method accurately calculates the concentration of the phosphate radical in the furnace water at the time t, effectively controls the content of the phosphate radical in the furnace water, prevents the phosphate hiding phenomenon, and provides guarantee for the safe operation of a system;
4. the method has the advantages of accurately calculating the adding amount of the phosphate, controlling the total content of the phosphate in the boiler water and effectively reducing the sludge amount in the boiler and the sludge treatment cost.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is further illustrated below with reference to examples and figures.
An on-line regulating method for the quality of boiler water of a low-pressure boiler is shown in figure 1 and comprises the following steps:
(1) furnace water adopts a continuous coordination phosphate treatment mode, a mathematical function model of the phosphate radical concentration at the time t is established, and the phosphate radical concentration C at the time t is calculated: establishing a mathematical function model of the phosphate radical concentration at the time t according to the evaporation capacity, the sewage discharge capacity, the initial phosphate radical concentration, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the operation time of the steam system, inputting the evaporation capacity, the sewage discharge capacity, the phosphate radical, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the operation time of the system at the time t, and calculating the phosphate radical concentration C at the time t;
(2) establishing a mathematical function model of the sodium-phosphorus molar ratio R, and resolving the furnace water R value at the time t: establishing a mathematical function model of the sodium-phosphorus molar ratio R according to the pH value and the phosphate radical concentration C, inputting the pH value and the phosphate radical concentration at the time t, and calculating the R value of the furnace water at the time t;
(3) establishing time t Na3PO4Adding amount mathematical function model, calculating furnace water Na at t moment3PO4Adding amount: according to the phosphate radical of the steam system, the control point phosphate radical, the furnace water R, the control points R and Na3PO4Solution concentration, establishing time t Na3PO4Adding amount mathematical function model, inputting the concentration of phosphate radical at t moment, the phosphate radical at control point, the furnace water R at t moment, the control points R and Na in the system3PO4Solution concentration, calculating furnace water Na at t moment3PO4Adding amount;
(4) establishing NaH at time t2PO4Adding amount mathematical function model, resolving furnace water NaH at t moment2PO4Adding amount: according to the phosphate radical of the steam system, the control point phosphate radical, the furnace water R, the control point R and the NaH2PO4Concentration of solution, establishment of NaH at time t2PO4A mathematical function model of the adding amount is input into the system, namely the concentration of phosphate radical at the t moment, the phosphate radical at a control point, furnace water R at the t moment, the control point R and NaH2PO4Solution concentration, calculating furnace water NaH at t moment2PO4The adding amount of the furnace water is adjusted through the phosphate radical concentration, the R and the phosphate adding amount, so that the water quality of the furnace water is adjusted.
The expression of the mathematical function model of the phosphate radical concentration at the time t in the step (1) is as follows:
in the formula:
f1(p,W,u,H,Q,C0) -a function;
f2(p,W,u,V0) -a function;
f3(p, W, u, H, Q) -function;
c0 — phosphate concentration at start;
phosphate radical concentration at time C-t;
t-time elapsed from C0 to C;
v0-volume of furnace water;
h-feed water hardness;
q is water supply flow;
p is the sewage discharge capacity;
u-steam humidity;
w is the evaporation capacity.
The function f1(p,W,u,H,Q,C0) Are related to p, W, u, H, Q,C0Linear function of p, W, u, H, Q, C0Increase and decrease and increase; the function f2(p,W,u,V0) Is related to p, W, u, V0Function of f2(p,W,u,V0) Is a linear function of p, W, u, decreasing with increasing p, W, u, increasing with decreasing f2(p,W,u,V0) Is V0Inverse proportional function with V0Increase and decrease and increase; the function f3(p, W, u, H, Q) is a function of p, W, u, H, Q, f3(p, W, u, H, Q) is a complex function of p, W, u, increasing with increasing p, W, u and decreasing with decreasing f3(p, W, u, H, Q) is a proportional function of H, Q that decreases with increasing H, Q and increases with decreasing H, Q.
The pH value in the step (2) is a furnace water pH detection value and is generated by phosphate hydrolysis, and the range is as follows: the pH value is more than or equal to 9 and less than or equal to 11.
In the step (2), the molar ratio R of sodium to phosphorus is the ratio of hydrolyzed sodium ions of phosphate to phosphate, and the range is as follows: the pH value is more than or equal to 2 and less than or equal to 3; the R value is obtained by resolving a mathematical function model of the R value and the furnace water phosphate concentration C, pH value at the time t, and the mathematical function model expression of the R value is as follows:
R＝f4(pH，C)
wherein the R value is an exponential function of the pH value, and the R value increases along with the increase of the pH value and decreases along with the decrease of the pH value; the value of R is a hyperbolic function of the phosphate concentration C at time t, and the value of R decreases with increasing value of C and increases with decreasing value.
Na in the step (3)3PO4The independent aqueous solution with the concentration of 1 to 10 percent, and the adding amount of Na3PO4Adding amount G, furnace water R at time t and sodium-phosphorus molar ratio R of control pointControlPhosphate radical concentration C at time t and phosphate radical concentration C at control pointControlResolving a mathematical function model to obtain; na (Na)3PO4The mathematical function model expression of the added quantity G is as follows:
in the formula G andR、Rcontrol、C、CControlIn a linear function relationship with G value as a function of RControl、CControlThe value increases and decreases, and the value of G decreases and increases as the value of R, C increases.
NaH in the step (4)2PO4The independent aqueous solution with the concentration of 1 to 10 percent is added with NaH2PO4Amount of addition G1The molar ratio R of the furnace water R and the control point sodium to the phosphorus at the time tControlPhosphate radical concentration C at time t and phosphate radical concentration C at control pointControlResolving a mathematical function model to obtain; NaH2PO4Amount of addition G1The mathematical function model of (2) is expressed as follows:
in the formula G1And R, RControl、C、CControlIn a linear function relationship of one degree, G1Value following RControlC value is increased and decreased, and G value is increased with R, CControlThe value increases and decreases.
When the method is concretely implemented, furnace water adopts a continuous coordination phosphate treatment mode, a phosphate radical mathematical function model is established according to the evaporation capacity, the sewage discharge capacity, the initial phosphate radical concentration, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the operation time of a steam system, the evaporation capacity, the sewage discharge capacity, the initial phosphate radical concentration, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the operation time of the system at the time t are input, and the phosphate radical concentration at the time t is calculated. The mathematical function model expression of phosphate radical is as follows:
function f1(p,W,u,H,Q,C0) Is related to p, W, u, H, Q, C0Linear function of p, W, u, H, Q, C0Is increased and is decreased and decreased.
Function(s)f2(p,W,u,V0) Is related to p, W, u, V0Function of f2(p,W,u,V0) Is a linear function of p, W, u, decreasing with increasing p, W, u and increasing with decreasing p, W, u. f. of2(p,W,u,V0) Is V0Inverse proportional function with V0Is increased and is decreased and decreased.
Function f3(p, W, u, H, Q) is a function of p, W, u, H, Q, f3(p, W, u, H, Q) is a complex function of p, W, u, increasing with increasing p, W, u and decreasing with decreasing p, W, u. f. of3(p, W, u, H, Q) is a proportional function of H, Q that decreases with increasing H, Q and increases with decreasing H, Q.
The online instrument detects and detects the pH value of furnace water, the pH value is generated by phosphate hydrolysis, and the range is as follows: the pH value is more than or equal to 9 and less than or equal to 11.
And establishing an R mathematical function model according to the pH value and the phosphate radical concentration, inputting the pH value and the phosphate radical concentration at the time t, and calculating the R value of the furnace water at the time t. The mathematical function model expression of R is as follows:
R＝f4(pH，C)
wherein the R value is an exponential function of the pH value, and the R value increases with the increase of the pH value and decreases with the decrease of the pH value. The value of R is a hyperbolic function of the phosphate concentration C at time t, and the value of R decreases with increasing value of C and increases with decreasing value.
According to the phosphate radical of the steam system, the control point phosphate radical, the furnace water R, the control points R and Na3PO4Concentration of solution, build-up of Na3PO4Adding amount mathematical function model, inputting the concentration of phosphate radical at t moment, the phosphate radical at control point, the furnace water R at t moment, the control points R and Na in the system3PO4Solution concentration, calculating furnace water Na at t moment3PO4Adding the amount. Na (Na)3PO4Is an independent aqueous solution with the concentration of 1 to 10 percent, Na3PO4The mathematical function model expression of the added quantity G is as follows:
wherein G and R, RControl、C、CControlIn a linear function relationship with G value as a function of RControl、CControlThe value increases with increasing and decreases with decreasing G value of R, C,
The value increases and decreases and increases.
According to the phosphate radical of the steam system, the control point phosphate radical, the furnace water R, the control point R and the NaH2PO4Concentration of the solution, establishment of NaH2PO4A mathematical function model of the adding amount is input into the system, namely the concentration of phosphate radical at the t moment, the phosphate radical at a control point, furnace water R at the t moment, the control point R and NaH2PO4Solution concentration, calculating furnace water NaH at t moment2PO4Adding the amount. Wherein NaH2PO4Is an independent aqueous solution with the concentration of 1 to 10 percent, NaH2PO4Amount of addition G1The mathematical function model of (2) is expressed as follows:
in the formula G1And R, RControl、C、CControlIn a linear function relationship of one degree, G1Value following RControl、C、
The value increases and decreases, decreases and increases, G1Value is R, CControlThe value increases and decreases.
The furnace water is introduced with phosphate radical concentration, and the adding amount of the R and the phosphate is adjusted, so that the water quality of the furnace water is adjusted.
Claims (7)
1. The on-line regulating method of the boiler water quality of the low-pressure boiler is characterized by comprising the following steps of:
(1) furnace water adopts a continuous coordination phosphate treatment mode, a mathematical function model of the phosphate radical concentration at the time t is established, and the phosphate radical concentration C at the time t is calculated: establishing a mathematical function model of the phosphate radical concentration at the time t according to the evaporation capacity, the sewage discharge capacity, the initial phosphate radical concentration, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the operation time of the steam system, inputting the evaporation capacity, the sewage discharge capacity, the phosphate radical, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the operation time of the system at the time t, and calculating the phosphate radical concentration C at the time t;
(2) establishing a mathematical function model of the sodium-phosphorus molar ratio R, and resolving the furnace water R value at the time t: establishing a mathematical function model of the sodium-phosphorus molar ratio R according to the pH value and the phosphate radical concentration C, inputting the pH value and the phosphate radical concentration at the time t, and calculating the R value of the furnace water at the time t;
(3) establishing time t Na3PO4Adding amount mathematical function model, calculating furnace water Na at t moment3PO4Adding amount: according to the phosphate radical of the steam system, the control point phosphate radical, the furnace water R, the control points R and Na3PO4Solution concentration, establishing time t Na3PO4Adding amount mathematical function model, inputting the concentration of phosphate radical at t moment, the phosphate radical at control point, the furnace water R at t moment, the control points R and Na in the system3PO4Solution concentration, calculating furnace water Na at t moment3PO4Adding amount;
(4) establishing NaH at time t2PO4Adding amount mathematical function model, resolving furnace water NaH at t moment2PO4Adding amount: according to the phosphate radical of the steam system, the control point phosphate radical, the furnace water R, the control point R and the NaH2PO4Concentration of solution, establishment of NaH at time t2PO4A mathematical function model of the adding amount is input into the system, namely the concentration of phosphate radical at the t moment, the phosphate radical at a control point, furnace water R at the t moment, the control point R and NaH2PO4Solution concentration, calculating furnace water NaH at t moment2PO4The adding amount of the furnace water is adjusted through the phosphate radical concentration, the R and the phosphate adding amount, so that the water quality of the furnace water is adjusted.
2. The on-line regulating method for the quality of the boiler water of the low-pressure boiler as claimed in claim 1, wherein the expression of the mathematical function model of the phosphate concentration at the time t in the step (1) is as follows:
in the formula:
f1(p,W,u,H,Q,C0) -a function;
f2(p,W,u,V0) -a function;
f3(p, W, u, H, Q) -function;
c0 — phosphate concentration at start;
phosphate radical concentration at time C-t;
t-time elapsed from C0 to C;
v0-volume of furnace water;
h-feed water hardness;
q is water supply flow;
p is the sewage discharge capacity;
u-steam humidity;
w is the evaporation capacity.
3. The method as claimed in claim 1 or 2, wherein the function f is a function of the quality of boiler water1(p,W,u,H,Q,C0) Is related to p, W, u, H, Q, C0Linear function of p, W, u, H, Q, C0Increase and decrease and increase; the function f2(p,W,u,V0) Is related to p, W, u, V0Function of f2(p,W,u,V0) Is a linear function of p, W, u, decreasing with increasing p, W, u, increasing with decreasing f2(p,W,u,V0) Is V0Inverse proportional function with V0Increase and decrease and increase; the function f3(p, W, u, H, Q) is a function of p, W, u, H, Q, f3(p, W, u, H, Q) is a complex function of p, W, u, increasing with increasing p, W, u and decreasing with decreasing f3(p, W, u, H, Q) is a proportional function of H, Q that decreases with increasing H, Q and increases with decreasing H, Q.
4. The method for on-line regulating the quality of the boiler water of the low pressure boiler as claimed in claim 1, wherein the pH value in the step (2) is a pH value of the boiler water, which is generated by phosphate hydrolysis and ranges from: the pH value is more than or equal to 9 and less than or equal to 11.
5. The method for on-line regulating the quality of the boiler water of the low-pressure boiler as claimed in claim 1, wherein the molar ratio R of sodium to phosphorus in the step (2) is the ratio of hydrolyzed sodium ions of phosphate to phosphate, and the range is as follows: the pH value is more than or equal to 2 and less than or equal to 3; the R value is obtained by resolving a mathematical function model of the R value and the furnace water phosphate concentration C, pH value at the time t, and the mathematical function model expression of the R value is as follows:
R＝f4(pH，C)
wherein the R value is an exponential function of the pH value, and the R value increases along with the increase of the pH value and decreases along with the decrease of the pH value; the value of R is a hyperbolic function of the phosphate concentration C at time t, and the value of R decreases with increasing value of C and increases with decreasing value.
6. The on-line regulating method for the quality of the boiler water of the low-pressure boiler as claimed in claim 1, wherein Na is added in the step (3)3PO4The independent aqueous solution with the concentration of 1 to 10 percent, and the adding amount of Na3PO4Adding amount G, furnace water R at time t and sodium-phosphorus molar ratio R of control pointControlPhosphate radical concentration C at time t and phosphate radical concentration C at control pointControlResolving a mathematical function model to obtain; na (Na)3PO4The mathematical function model expression of the added quantity G is as follows:
wherein G and R, RControl、C、CControlIn a linear function relationship with G value as a function of RControl、CControlThe value increases and decreases, and the value of G decreases and increases as the value of R, C increases.
7. The on-line regulating method for the quality of the boiler water of the low-pressure boiler as claimed in claim 1, wherein the NaH in the step (4)2PO4The independent aqueous solution with the concentration of 1 to 10 percent is added with NaH2PO4Amount of addition G1The molar ratio R of the furnace water R and the control point sodium to the phosphorus at the time tControlPhosphate radical concentration C at time t and phosphate radical concentration C at control pointControlResolving a mathematical function model to obtain; NaH2PO4Amount of addition G1The mathematical function model of (2) is expressed as follows:
in the formula G1And R, RControl、C、CControlIn a linear function relationship of one degree, G1Value following RControlC value is increased and decreased, and G value is increased with R, CControlThe value increases and decreases.
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