CN113880155B - Online adjusting method for water quality of low-pressure boiler water - Google Patents
Online adjusting method for water quality of low-pressure boiler water Download PDFInfo
- Publication number
- CN113880155B CN113880155B CN202111184258.8A CN202111184258A CN113880155B CN 113880155 B CN113880155 B CN 113880155B CN 202111184258 A CN202111184258 A CN 202111184258A CN 113880155 B CN113880155 B CN 113880155B
- Authority
- CN
- China
- Prior art keywords
- phosphate
- concentration
- value
- furnace water
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 145
- 238000000034 method Methods 0.000 title claims abstract description 15
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 127
- 239000010452 phosphate Substances 0.000 claims abstract description 127
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 66
- 238000007620 mathematical function Methods 0.000 claims abstract description 57
- 239000011734 sodium Substances 0.000 claims abstract description 42
- 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 35
- 229910052739 hydrogen Inorganic materials 0.000 claims description 34
- 230000003247 decreasing effect Effects 0.000 claims description 21
- 239000000243 solution Substances 0.000 claims description 20
- 239000007864 aqueous solution Substances 0.000 claims description 14
- 238000012886 linear function Methods 0.000 claims description 12
- 238000001704 evaporation Methods 0.000 claims description 11
- 229910052708 sodium Inorganic materials 0.000 claims description 10
- 230000008020 evaporation Effects 0.000 claims description 9
- 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
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000007062 hydrolysis Effects 0.000 claims description 6
- 238000006460 hydrolysis reaction Methods 0.000 claims description 6
- 230000033228 biological regulation Effects 0.000 claims description 3
- 229910001415 sodium ion Inorganic materials 0.000 claims description 3
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims 4
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims 2
- 235000017557 sodium bicarbonate Nutrition 0.000 claims 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 6
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 7
- 238000012797 qualification Methods 0.000 description 6
- 239000010802 sludge Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- 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 adjusting the water quality of low-pressure boiler water, which comprises the following steps ofThe method comprises the following steps: (1) The furnace water adopts a continuous coordination phosphate treatment mode, a mathematical function model of the phosphate concentration at the moment t is built, and the phosphate concentration C at the moment t is solved; (2) Establishing a mathematical function model of the sodium-phosphorus molar ratio R, and calculating the furnace water R value at the moment t; (3) Build time t Na 3 PO 4 Adding quantity mathematical function model to calculate furnace water Na at time t 3 PO 4 The addition amount is calculated; (4) Establishing NaH at t moment 2 PO 4 Adding quantity mathematical function model to calculate furnace water NaH at time t 2 PO 4 The addition amount is as follows. The furnace water is regulated by the concentration C of phosphate radical, 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 in the index range, and the phenomena of free sodium hydroxide corrosion and phosphate hiding are prevented.
Description
Technical Field
The invention belongs to the field of water treatment, and particularly relates to an online adjustment method for the water quality of low-pressure boiler water.
Background
In the running process of some low-pressure boilers, the working condition is changed frequently, the stability of the water quality of the boiler is poor, the qualification rate of the water quality index of the boiler is difficult to ensure by the traditional offline detection intermittent adjustment coordinated phosphate method, so that the contents of free alkali and sludge in the boiler are more, the boiler is rusted to different degrees, the safe running of the system is seriously affected, and an online water quality adjustment method is urgently needed to improve the qualification rate of the water quality index of the boiler. However, due to the restriction of the phosphate online detection technology, the online detection value of the phosphorus meter has delay of 5-15 minutes, the working condition of certain low-pressure boilers is frequently changed, the stability of the water quality of the boiler is poor, the existing phosphate online detection technology is directly applied to the low-pressure boilers, and the qualification rate of the water quality index of the boiler is difficult to improve. In order to improve the qualification rate of the boiler water index, reduce the content of free alkali and sludge in the boiler and ensure the safe operation of the system, an online boiler water quality adjusting method which is suitable for the low-pressure boiler and is suitable for the existing detection technology is urgently needed.
Disclosure of Invention
The invention aims to provide the online water quality adjusting method for the low-pressure boiler water, which solves the problems in the background art, is suitable for the water quality adjustment of the low-pressure boiler water with frequent working condition change and poor water quality stability, and can effectively improve the qualification rate of the water index.
The technical scheme adopted for achieving the purpose is that the low-pressure boiler water quality online adjusting method comprises the following steps:
(1) The furnace water adopts a continuous coordination phosphate treatment mode, a mathematical function model of the phosphate radical concentration at the moment t is built, and the phosphate radical concentration C at the moment t is solved: according to the evaporation capacity, the pollution discharge capacity, the initial phosphate radical concentration, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the running time of a steam system, a mathematical function model of the phosphate radical concentration at the moment t is built, the evaporation capacity, the pollution discharge capacity, the phosphate radical, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the running time of the steam system at the moment t are input, and the phosphate radical concentration C at the moment t is calculated;
(2) Establishing a mathematical function model of the sodium-phosphorus molar ratio R, and calculating the furnace water R value at the moment t: according to the pH value and the phosphate concentration C, a mathematical function model of the sodium-phosphorus molar ratio R is established, the pH value and the phosphate concentration at the moment t are input, and the furnace water R value at the moment t is calculated;
(3) Build time t Na 3 PO 4 Adding quantity mathematical function model to calculate furnace water Na at time t 3 PO 4 The addition amount is as follows: according to the phosphate radical, the phosphate radical of the control point, the furnace water R, the control point R and Na of the steam system 3 PO 4 Solution concentration, build up of time t Na 3 PO 4 The mathematical function model of the addition quantity is input into the system, namely the concentration of phosphate radical at the time t, phosphate radical at the control point, furnace water R at the time t, control point R and Na 3 PO 4 Solution concentration, solution furnace water Na at time t 3 PO 4 The addition amount is calculated;
(4) Establishing NaH at t moment 2 PO 4 Adding quantity mathematical function model and calculating t momentFurnace water NaH 2 PO 4 The addition amount is as follows: according to the phosphate radical, the phosphate radical of the control point, the furnace water R, the control point R and the NaH of the steam system 2 PO 4 Solution concentration, naH at t moment is established 2 PO 4 The addition quantity mathematical function model is input into the system, namely the concentration of phosphate radical at the time t, phosphate radical at the control point, furnace water R at the time t, control point R and NaH 2 PO 4 Solution concentration, and solving furnace water NaH at time t 2 PO 4 The adding amount of the furnace water is regulated by the concentration of phosphate radical, R and the adding amount of phosphate, so as to realize the water quality regulation of the furnace water.
Further, the expression of the mathematical function model of the phosphate concentration at the time t in the step (1) is as follows:
wherein:
f 1 (p,W,u,H,Q,C 0 ) -a function;
f 2 (p,W,u,V 0 ) -a function;
f 3 (p, W, u, H, Q) -function;
c0—initial phosphate concentration;
phosphate concentration at C-t;
t-elapsed time from C0 to C;
v0-furnace water volume;
h-hardness of water supply;
q-feed water flow;
p-discharge capacity;
u-steam humidity;
w-evaporation amount.
Further, the function f 1 (p,W,u,H,Q,C 0 ) Is p, W, u, H, Q, C 0 As p, W, u, H, Q, C 0 Is increased and decreased; the function f 2 (p,W,u,V 0 ) Is p, W, u, V 0 F is a function of (f) 2 (p,W,u,V 0 ) Is a linear function of p, W, u, with p, W, uIncrease and decrease and increase, f 2 (p,W,u,V 0 ) V of yes 0 Inverse proportional function, following V 0 Is increased and decreased; the function f 3 (p, W, u, H, Q) is a function of p, W, u, H, Q, f 3 (p, W, u, H, Q) is a complex function of p, W, u, decreasing with increasing p, W, u, f 3 (p, W, u, H, Q) is a H, Q direct proportional function 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 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, the molar ratio R of sodium to phosphorus in the step (2) is the ratio of phosphate hydrolysis sodium ions to phosphate radicals, and the range is as follows: pH is more than or equal to 2 and less than or equal to 3; the R value is calculated by solving a mathematical function model of the R value and the furnace water phosphate concentration C, pH at the moment t, and the mathematical function model expression of the R value is as follows:
R＝f 4 (pH，C)
wherein the R value is an exponential function of the pH value, and the R value increases and decreases with increasing pH value; the R value is a hyperbolic function of the phosphate concentration C at time t, and decreases as the C value increases, and increases as the C value increases.
Further, na in the step (3) 3 PO 4 The concentration of the independent aqueous solution is 1 to 10 percent, and the adding amount of the independent aqueous solution is Na 3 PO 4 Furnace water R at the moment of adding quantity G and t and sodium-phosphorus mole ratio R at control point Control device Phosphate radical concentration C at time t and control point phosphate radical concentration C Control device Obtaining a mathematical function model through calculation; na (Na) 3 PO 4 The mathematical function model expression of the addition amount G is as follows:
g and R, R in the formula Control device 、C、C Control device In linear function, G value is related to R Control device 、C Control device The value increases and decreases, the G value decreases and increases as the R, C value increases and decreases.
Further, naH in the step (4) 2 PO 4 The concentration of the independent aqueous solution is 1 to 10 percent, and the adding amount of the independent aqueous solution is NaH 2 PO 4 Dosage G 1 Molar ratio R of sodium to phosphorus with furnace water R and control point at time t Control device Phosphate concentration C at time t and phosphate concentration C at control point Control device Obtaining a mathematical function model through calculation; naH (NaH) 2 PO 4 Dosage G 1 The mathematical function model expression of (2) is as follows:
g in 1 And R, R Control device 、C、C Control device In linear function relation, G 1 Value with R Control device The C value increases and decreases, the G value increases with R, C Control device The value increases and increases, and decreases.
Advantageous effects
Compared with the prior art, the invention has the following advantages.
1. According to the invention, the water quality of the furnace water is regulated on line, the water quality deviation of the furnace water is controlled, and experiments show that the qualification rate of the water quality index of the furnace water can be effectively improved;
2. according to the method, the phosphate radical concentration at the time t of the boiler water is accurately calculated, the content of free sodium hydroxide in the boiler water is controlled, the free alkali corrosion perforation phenomenon of the boiler heat transfer pipe is effectively prevented, and the safe operation of the system is ensured;
3. the invention can accurately calculate the phosphate concentration of the furnace water at the moment t, effectively control the phosphate content in the furnace water, prevent the occurrence of the 'phosphate hiding phenomenon', and provide guarantee for the safe operation of the system;
4. the invention can accurately calculate the adding amount of phosphate, control the total content of phosphate in furnace water, and effectively reduce the sludge amount and the sludge treatment cost in the boiler.
Drawings
The present invention is described in further detail below with reference to the accompanying drawings.
FIG. 1 is a flow chart of an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to examples and figures.
An online adjustment method for the water quality of low-pressure boiler water, as shown in fig. 1, comprises the following steps:
(1) The furnace water adopts a continuous coordination phosphate treatment mode, a mathematical function model of the phosphate radical concentration at the moment t is built, and the phosphate radical concentration C at the moment t is solved: according to the evaporation capacity, the pollution discharge capacity, the initial phosphate radical concentration, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the running time of a steam system, a mathematical function model of the phosphate radical concentration at the moment t is built, the evaporation capacity, the pollution discharge capacity, the phosphate radical, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the running time of the steam system at the moment t are input, and the phosphate radical concentration C at the moment t is calculated;
(2) Establishing a mathematical function model of the sodium-phosphorus molar ratio R, and calculating the furnace water R value at the moment t: according to the pH value and the phosphate concentration C, a mathematical function model of the sodium-phosphorus molar ratio R is established, the pH value and the phosphate concentration at the moment t are input, and the furnace water R value at the moment t is calculated;
(3) Build time t Na 3 PO 4 Adding quantity mathematical function model to calculate furnace water Na at time t 3 PO 4 The addition amount is as follows: according to the phosphate radical, the phosphate radical of the control point, the furnace water R, the control point R and Na of the steam system 3 PO 4 Solution concentration, build up of time t Na 3 PO 4 The mathematical function model of the addition quantity is input into the system, namely the concentration of phosphate radical at the time t, phosphate radical at the control point, furnace water R at the time t, control point R and Na 3 PO 4 Solution concentration, solution furnace water Na at time t 3 PO 4 The addition amount is calculated;
(4) Establishing NaH at t moment 2 PO 4 Adding quantity mathematical function model to calculate furnace water NaH at time t 2 PO 4 The addition amount is as follows: according to the phosphate radical, the phosphate radical of the control point, the furnace water R, the control point R and the NaH of the steam system 2 PO 4 Solution concentration, naH at t moment is established 2 PO 4 The addition quantity mathematical function model is input into the system, namely the concentration of phosphate radical at the time t, phosphate radical at the control point, furnace water R at the time t, control point R and NaH 2 PO 4 Solution concentration, and solving furnace water NaH at time t 2 PO 4 The adding amount of the furnace water is regulated by the concentration of phosphate radical, R and the adding amount of phosphate, so as to realize the water quality regulation of the furnace water.
The expression of the mathematical function model of the phosphate concentration at the moment t in the step (1) is as follows:
wherein:
f 1 (p,W,u,H,Q,C 0 ) -a function;
f 2 (p,W,u,V 0 ) -a function;
f 3 (p, W, u, H, Q) -function;
c0—initial phosphate concentration;
phosphate concentration at C-t;
t-elapsed time from C0 to C;
v0-furnace water volume;
h-hardness of water supply;
q-feed water flow;
p-discharge capacity;
u-steam humidity;
w-evaporation amount.
The function f 1 (p,W,u,H,Q,C 0 ) Is p, W, u, H, Q, C 0 As p, W, u, H, Q, C 0 Is increased and decreased; the function f 2 (p,W,u,V 0 ) Is p, W, u, V 0 F is a function of (f) 2 (p,W,u,V 0 ) Is a linear function of p, W, u, decreasing with increasing f 2 (p,W,u,V 0 ) V of yes 0 Inverse proportional function, following V 0 Is increased and decreased; the function f 3 (p, W, u, H, Q) is a function of p, W, u, H, Q, f 3 (p, W, u, H, Q) is a complex function of p, W, u, decreasing with increasing p, W, u, f 3 (p, W, u, H, Q) is proportional to H, QThe example function decreases with increasing H, Q and increases with decreasing.
The pH value in the step (2) is the detection value of the pH of furnace water, 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.
The molar ratio R of sodium to phosphorus in the step (2) is the ratio of phosphate hydrolysis sodium ions to phosphate radicals, and the range is as follows: pH is more than or equal to 2 and less than or equal to 3; the R value is calculated by solving a mathematical function model of the R value and the furnace water phosphate concentration C, pH at the moment t, and the mathematical function model expression of the R value is as follows:
R＝f 4 (pH，C)
wherein the R value is an exponential function of the pH value, and the R value increases and decreases with increasing pH value; the R value is a hyperbolic function of the phosphate concentration C at time t, and decreases as the C value increases, and increases as the C value increases.
Na in the step (3) 3 PO 4 The concentration of the independent aqueous solution is 1 to 10 percent, and the adding amount of the independent aqueous solution is Na 3 PO 4 Furnace water R at the moment of adding quantity G and t and sodium-phosphorus mole ratio R at control point Control device Phosphate radical concentration C at time t and control point phosphate radical concentration C Control device Obtaining a mathematical function model through calculation; na (Na) 3 PO 4 The mathematical function model expression of the addition amount G is as follows:
g and R, R in the formula Control device 、C、C Control device In linear function, G value is related to R Control device 、C Control device The value increases and decreases, the G value decreases and increases as the R, C value increases and decreases.
NaH in the step (4) 2 PO 4 The concentration of the independent aqueous solution is 1 to 10 percent, and the adding amount of the independent aqueous solution is NaH 2 PO 4 Dosage G 1 Molar ratio R of sodium to phosphorus with furnace water R and control point at time t Control device Phosphate concentration C at time t and phosphate concentration C at control point Control device Obtaining a mathematical function model through calculation; naH (NaH) 2 PO 4 Dosage G 1 The mathematical function model expression of (2) is as follows:
g in 1 And R, R Control device 、C、C Control device In linear function relation, G 1 Value with R Control device The C value increases and decreases, the G value increases with R, C Control device The value increases and increases, and decreases.
In the specific implementation of the invention, the furnace water adopts a continuous coordination phosphate treatment mode, a phosphate mathematical function model is established according to the evaporation capacity, the pollution discharge capacity, the initial phosphate concentration, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the running time of a steam system, the evaporation capacity, the pollution discharge capacity, the initial phosphate concentration, the water supply flow, the water supply hardness, the steam humidity and the running time of the system are input at the moment t, and the phosphate concentration at the moment t is calculated. The phosphate mathematical function model expression is as follows:
function f 1 (p,W,u,H,Q,C 0 ) Is p, W, u, H, Q, C 0 As p, W, u, H, Q, C 0 And increases and decreases.
Function f 2 (p,W,u,V 0 ) Is p, W, u, V 0 F is a function of (f) 2 (p,W,u,V 0 ) Is a linear function of p, W, u, decreasing with increasing p, W, u, decreasing with decreasing p, W, u. f (f) 2 (p,W,u,V 0 ) V of yes 0 Inverse proportional function, following V 0 And increases and decreases.
Function f 3 (p, W, u, H, Q) is a function of p, W, u, H, Q, f 3 (p, W, u, H, Q) is a complex function of p, W, u, increasing with increasing p, W, u, decreasing with decreasing p, W, u. f (f) 3 (p, W, u, H, Q) is a H, Q direct proportional function that decreases with increasing H, Q, decreases and increases。
The online instrument detects the pH value of the furnace water, wherein 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 (3) establishing an R mathematical function model according to the pH value and the phosphate concentration, inputting the pH value and the phosphate concentration at the moment t, and calculating the R value of the furnace water at the moment t. The expression of the R mathematical function model is as follows:
R＝f 4 (pH，C)
wherein the R value is an exponential function of the pH value, and the R value increases and decreases as the pH value increases. The R value is a hyperbolic function of the phosphate concentration C at time t, and decreases as the C value increases, and increases as the C value increases.
According to the phosphate radical, the phosphate radical of the control point, the furnace water R, the control point R and Na of the steam system 3 PO 4 Concentration of solution, build up of Na 3 PO 4 The mathematical function model of the addition quantity is input into the system, namely the concentration of phosphate radical at the time t, phosphate radical at the control point, furnace water R at the time t, control point R and Na 3 PO 4 Solution concentration, solution furnace water Na at time t 3 PO 4 The addition amount is as follows. Na (Na) 3 PO 4 Is an independent aqueous solution with the concentration of 1 to 10 percent, na 3 PO 4 The mathematical function model expression of the addition amount G is as follows:
g and R, R in the formula Control device 、C、C Control device In linear function, G value is related to R Control device 、C Control device Increasing and decreasing the value, and decreasing the G value with R, C,
The value increases and decreases and increases.
According to the phosphate radical, the phosphate radical of the control point, the furnace water R, the control point R and the NaH of the steam system 2 PO 4 Solution concentration, build up of NaH 2 PO 4 The addition quantity mathematical function model is input into the system, namely the concentration of phosphate radical at the time t, phosphate radical at the control point, furnace water R at the time t, control point RNaH 2 PO 4 Solution concentration, and solving furnace water NaH at time t 2 PO 4 The addition amount is as follows. Wherein NaH is 2 PO 4 Is an independent aqueous solution with the concentration of 1 to 10 percent, naH 2 PO 4 Dosage G 1 The mathematical function model expression of (2) is as follows:
g in 1 And R, R Control device 、C、C Control device In linear function relation, G 1 Value with R Control device 、C、
The value increases and decreases, decreases and increases, G 1 Value of R, C Control device The value increases and increases, and decreases.
And the concentration of phosphate radical, R and the addition amount of phosphate are adjusted to realize the water quality adjustment of the furnace water.
Claims (2)
1. The online water quality adjusting method for the low-pressure boiler water is characterized by comprising the following steps of:
(1) The furnace water adopts a continuous coordination phosphate treatment mode, a mathematical function model of the phosphate radical concentration at the moment t is built, and the phosphate radical concentration C at the moment t is solved: according to the evaporation capacity, the pollution discharge capacity, the initial phosphate radical concentration, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the running time of a steam system, a mathematical function model of the phosphate radical concentration at the moment t is built, the evaporation capacity, the pollution discharge capacity, the initial phosphate radical concentration, the water supply flow, the furnace water volume, the water supply hardness, the steam humidity and the running time of the steam system at the moment t are input, and the phosphate radical concentration C at the moment t is calculated;
the expression of the mathematical function model of the phosphate concentration at the time t is as follows:
wherein: f (f) 1 (p,W,u,H,Q,C 0 ) -a function;
f 2 (p,W,u,V 0 ) -a function;
f 3 (p, W, u, H, Q) -function;
C 0 -starting phosphate concentration;
phosphate concentration at C-t;
t is represented by C 0 Time elapsed until C;
V 0 -furnace water volume;
h-hardness of water supply;
q-feed water flow;
p-discharge capacity;
u-steam humidity;
w is the evaporation capacity;
the function f 1 (p,W,u,H,Q,C 0 ) Is p, W, u, H, Q, C 0 As p, W, u, H, Q, C 0 Is increased and decreased; the function f 2 (p,W,u,V 0 ) Is p, W, u, V 0 F is a function of (f) 2 (p,W,u,V 0 ) Is a linear function of p, W, u, decreasing with increasing f 2 (p,W,u,V 0 ) V of yes 0 Inverse proportional function, following V 0 Is increased and decreased; the function f 3 (p, W, u, H, Q) is a function of p, W, u, H, Q, f 3 (p, W, u, H, Q) is a complex function of p, W, u, decreasing with increasing p, W, u, f 3 (p, W, u, H, Q) is a H, Q direct proportional function that decreases with increasing H, Q and increases with decreasing;
(2) Establishing a mathematical function model of the sodium-phosphorus molar ratio R, and calculating the furnace water R value at the moment t: according to the pH value of the furnace water and the phosphate concentration C, a mathematical function model of the sodium-phosphorus molar ratio R is established, the pH value of the furnace water and the phosphate concentration at the moment t are input, and the furnace water R at the moment t is calculated;
the molar ratio R of sodium to phosphorus is the ratio of phosphate hydrolyzed sodium ions to phosphate radicals, and the range is as follows: pH is more than or equal to 2 and less than or equal to 3; the R value is calculated by solving a mathematical function model of the R value and the furnace water phosphate concentration C, pH at the moment t, and the mathematical function model expression of the R value is as follows:
R＝f 4 (pH，C)
wherein the R value is an exponential function of the pH value, and the R value increases and decreases with increasing pH value; the R value is a hyperbolic function of the phosphate concentration C at the moment t, and decreases as the C value increases and increases;
(3) Build time t Na 3 PO 4 Adding quantity mathematical function model to calculate furnace water Na at time t 3 PO 4 The addition amount is as follows: according to the phosphate radical concentration of the steam system, the phosphate radical concentration of the control point, the furnace water R and the control point R Control device Na and Na 3 PO 4 Solution concentration, build up of time t Na 3 PO 4 The addition quantity mathematical function model is input into a system at the time t of the phosphate concentration, the phosphate concentration at the control point, the furnace water R at the time t and the control point R Control device Na and Na 3 PO 4 Solution concentration, solution furnace water Na at time t 3 PO 4 The addition amount is calculated;
the Na is 3 PO 4 The concentration of the independent aqueous solution is 1 to 10 percent, and the adding amount of the independent aqueous solution is Na 3 PO 4 Furnace water R at the moment of adding quantity G and t and sodium-phosphorus mole ratio R at control point Control device Phosphate radical concentration C at time t and control point phosphate radical concentration C Control device Obtaining a mathematical function model through calculation; na (Na) 3 PO 4 The mathematical function model expression of the addition amount G is as follows:
g and R, R in the formula Control device 、C、C Control device In linear function, G value is related to R Control device 、C Control device The value increases and increases, decreases and decreases, and the G value increases and decreases as the R, C value increases and increases;
(4) Establishing NaH at t moment 2 PO 4 Adding quantity mathematical function model to calculate furnace water NaH at time t 2 PO 4 The addition amount is as follows: according to the phosphate radical concentration of the steam system, the phosphate radical concentration of the control point, the furnace water R and the control point R Control device NaH (sodium hydrogen carbonate) 2 PO 4 Solution concentration, naH at t moment is established 2 PO 4 The addition quantity mathematical function model is input into a system at the time t of the phosphate concentration, the phosphate concentration at the control point, the furnace water R at the time t and the control point R Control device NaH (sodium hydrogen carbonate) 2 PO 4 Solution concentration, and solving furnace water NaH at time t 2 PO 4 The addition amount is calculated;
the NaH is 2 PO 4 The concentration of the independent aqueous solution is 1 to 10 percent, and the adding amount of the independent aqueous solution is NaH 2 PO 4 Dosage G 1 Molar ratio R of sodium to phosphorus with furnace water R and control point at time t Control device Phosphate concentration C at time t and phosphate concentration C at control point Control device Obtaining a mathematical function model through calculation; naH (NaH) 2 PO 4 Dosage G 1 The mathematical function model expression of (2) is as follows:
g in 1 And R, R Control device 、C、C Control device In linear function relation, G 1 Value with R Control device The C value increases and decreases, the G value increases with R, C Control device The value increases and increases, and decreases.
2. The on-line regulation method of low-pressure boiler water quality according to claim 1, wherein the pH value of the boiler water in the step (2) 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111184258.8A CN113880155B (en) | 2021-10-11 | 2021-10-11 | Online adjusting method for water quality of low-pressure boiler water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111184258.8A CN113880155B (en) | 2021-10-11 | 2021-10-11 | Online adjusting method for water quality of low-pressure boiler water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113880155A CN113880155A (en) | 2022-01-04 |
| CN113880155B true CN113880155B (en) | 2023-05-05 |
Family
ID=79006198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111184258.8A Active CN113880155B (en) | 2021-10-11 | 2021-10-11 | Online adjusting method for water quality of low-pressure boiler water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113880155B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114853142B (en) * | 2022-05-25 | 2023-08-08 | 九江七所精密机电科技有限公司 | Marine low-pressure boiler water free NaOH regulation and control method and system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2078001U (en) * | 1990-09-15 | 1991-05-29 | 大同第二发电厂科学技术协会 | Boiler water mole-ratio monitoring instrument |
| US5132916A (en) * | 1990-05-21 | 1992-07-21 | Elsag International B.V. | Methodology for ph titration curve estimation for adaptive control |
| EP0640747A1 (en) * | 1993-08-20 | 1995-03-01 | Nalco Chemical Company | Boiler system pH/phosphate program control method |
| CN103159347A (en) * | 2013-03-28 | 2013-06-19 | 鞍钢股份有限公司 | Method for quickly eliminating acid phosphate hiding of coke dry quenching waste heat boiler |
| CN107601632A (en) * | 2017-10-30 | 2018-01-19 | 清华大学深圳研究生院 | A kind of coagulation Automatic Dosing control method and system |
| CN108217987A (en) * | 2018-01-08 | 2018-06-29 | 中国恩菲工程技术有限公司 | Waste heat boiler dosing blowdown control method |
| CN113418184A (en) * | 2021-07-10 | 2021-09-21 | 湖南华菱湘钢节能发电有限公司 | Treatment method for steam drum furnace phosphate hiding phenomenon |
-
2021
- 2021-10-11 CN CN202111184258.8A patent/CN113880155B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5132916A (en) * | 1990-05-21 | 1992-07-21 | Elsag International B.V. | Methodology for ph titration curve estimation for adaptive control |
| CN2078001U (en) * | 1990-09-15 | 1991-05-29 | 大同第二发电厂科学技术协会 | Boiler water mole-ratio monitoring instrument |
| EP0640747A1 (en) * | 1993-08-20 | 1995-03-01 | Nalco Chemical Company | Boiler system pH/phosphate program control method |
| CN103159347A (en) * | 2013-03-28 | 2013-06-19 | 鞍钢股份有限公司 | Method for quickly eliminating acid phosphate hiding of coke dry quenching waste heat boiler |
| CN107601632A (en) * | 2017-10-30 | 2018-01-19 | 清华大学深圳研究生院 | A kind of coagulation Automatic Dosing control method and system |
| CN108217987A (en) * | 2018-01-08 | 2018-06-29 | 中国恩菲工程技术有限公司 | Waste heat boiler dosing blowdown control method |
| CN113418184A (en) * | 2021-07-10 | 2021-09-21 | 湖南华菱湘钢节能发电有限公司 | Treatment method for steam drum furnace phosphate hiding phenomenon |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113880155A (en) | 2022-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Rossum et al. | An evaluation of the calcium carbonate saturation indexes | |
| WO2021212777A1 (en) | Automatic dosing control system and method for wastewater softening pretreatment system | |
| CN113880155B (en) | Online adjusting method for water quality of low-pressure boiler water | |
| CN105759712B (en) | The precise control device and method of condensation water Automatic Ammonia adding | |
| CN103771553B (en) | The adaptive fuzzy control method of wet flue gas desulfurization waste water evaporation process | |
| CN109521813B (en) | A system and method for stabilizing the concentration ratio of circulating water in a thermal power plant | |
| CN102080820A (en) | An Optimum Energy Saving Control Method for Steam Boiler Surface Blowdown | |
| CN103880230A (en) | Segmental oxidation treatment system and treatment method of thermodynamic system of novel coal-fired power plant | |
| CN103159347B (en) | Method for quickly eliminating acid phosphate hiding of coke dry quenching waste heat boiler | |
| CN110564442A (en) | Automatic regulating and controlling system for corrosion prevention of distillation tower top process | |
| CN212833139U (en) | An automatic dosing control system for a waste water softening pretreatment system | |
| CN112361322A (en) | Boiler feed water automatic ammonia adding device and gray prediction feedforward PID control method | |
| CN111396856A (en) | A low-level deaerator system | |
| CN111623339A (en) | Method for recycling sewage discharged by steam boiler in operation of hot water boiler | |
| CN217007985U (en) | A circuit board etching detection and feeding control device with precise feeding function | |
| CN207313319U (en) | Recirculated water Intelligent medicine adding device | |
| CN206145657U (en) | Exhaust -heat boiler flue gas discharge system | |
| CN112125359B (en) | Automatic dosing control system and control method suitable for electric furnace water system | |
| CN204440183U (en) | A kind of decarburization hard-off water is the recirculated water concentration rate control system of moisturizing | |
| CN212057244U (en) | Low-level deaerator system | |
| CN110777373B (en) | Sodium hydroxide treatment device and method for high-pressure-increasing drainage system of power plant | |
| CN206881494U (en) | A kind of lime stone slurry supply system of wide Load Regulation | |
| CN115078670A (en) | Water vapor simulation test device and method for power plant | |
| CN114853142B (en) | Marine low-pressure boiler water free NaOH regulation and control method and system | |
| CN202415287U (en) | Quality adjusting device of water produced by desalination of seawater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |