CN110850908A - Method and device for adjusting pH value of boiler feed water and computer readable storage medium - Google Patents
Method and device for adjusting pH value of boiler feed water and computer readable storage medium Download PDFInfo
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- CN110850908A CN110850908A CN201911092828.3A CN201911092828A CN110850908A CN 110850908 A CN110850908 A CN 110850908A CN 201911092828 A CN201911092828 A CN 201911092828A CN 110850908 A CN110850908 A CN 110850908A
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D21/02—Control of chemical or physico-chemical variables, e.g. pH value characterised by the use of electric means
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention discloses a method for adjusting the pH value of boiler feed water, which comprises the following steps: acquiring the flow of liquid at an ammoniation part, and judging whether the variable quantity of the flow is greater than a preset threshold value or not; if so, calculating an ammonia adding frequency value of the metering pump corresponding to the ammonia adding position according to the variable quantity of the flow; and adjusting the ammonia adding frequency of the metering pump according to the calculated ammonia adding frequency value so as to enable the change range of the PH value of the boiler feed water to be in a preset range. The invention also discloses a device for adjusting the PH value of the boiler feed water and a computer readable storage medium. The invention avoids the time delay caused by independently adopting the specific conductivity meter to adjust the ammoniation frequency, effectively improves the accuracy of the PH value of the boiler feed water and ensures that the PH value is kept in a normal range.
Description
Technical Field
The invention relates to the technical field of boiler feed water, in particular to a method and a device for adjusting the pH value of boiler feed water and a computer readable storage medium.
Background
In order to prevent the acidic corrosion of the boiler, the pH value of the existing large-scale generator set is improved by adding ammonia into water, and the ammonia does not increase the salt content and alkalinity in the water of the boiler and influence the steam quality. In addition, due to the volatility of ammonia, the ammonia can reach the whole water vapor system, so that the equipment and pipelines of water supply, condensed water, drainage and other systems are protected. The feed water pH control plays an important role in the safe operation of the boiler, the accurate pH control can avoid the corrosion and scaling of the boiler, the refined water production amount can be increased, and the water quality is stabilized.
The ammonia adding pump is a metering pump with adjustable stroke and variable frequency, the first ammonia adding point is arranged on a mother pipe after condensate fine treatment, and the dosage is controlled by a pH meter and a specific conductivity meter at an inlet of a deaerator; the second ammonia adding point is on the downcomer of the deaerator, namely on the inlet pipeline of the water supply pump, and the dosage is controlled by a water supply pH meter and a specific conductivity meter. Because the on-line pH meter and the specific conductivity meter are cooled by the high-temperature sampling frame, the sampling measurement can be carried out, the sampling meters are arranged in a centralized manner, the investment is saved, and the management is convenient, so that the sampling pipeline is very long, the meter has very large delay on the detection of water quality, particularly, in the process of quick load lifting of a unit, the change of the water supply flow in a short time is very large, at the moment, the ammonia addition according to the pH meter and the specific conductivity meter has very large delay, the fluctuation range of the pH reaches +/-0.5, particularly, when the water supply flow and the condensed water flow are increased suddenly and greatly, before the meter is not changed, the ammonia addition amount is not adjusted, the pH value of the water supply is reduced, and the risk of corroding.
Disclosure of Invention
The invention mainly aims to provide a method and a device for adjusting the pH value of boiler feed water and a computer readable storage medium, and aims to solve the technical problem that the pH value of feed water fluctuates greatly when the feed water flow changes greatly.
Preferably, the method for adjusting the pH value of the boiler feed water comprises the following steps:
acquiring the flow of liquid at an ammoniation part, and judging whether the variable quantity of the flow is greater than a preset threshold value or not;
if so, calculating an ammonia adding frequency value of the metering pump corresponding to the ammonia adding position according to the variable quantity of the flow;
and adjusting the ammonia adding frequency of the metering pump according to the calculated ammonia adding frequency value so as to enable the change range of the PH value of the boiler feed water to be in a preset range.
Preferably, the formula for calculating the value of the ammonia addition frequency of the metering pump corresponding to the ammonia addition position according to the variation of the flow rate is as follows:
F＝C1×Q/(C2×B)；
wherein F is the ammoniation frequency of the metering pump, C1Is the target ammonia concentration of the liquid at the point of ammonia addition, Q is the amount of change in the flow rate of the liquid at the point of ammonia addition, C2The concentration of the ammonia solution in the ammonia dissolving medicine box is shown, and B is the flow variation of the metering pump when the ammonia adding frequency of the metering pump is increased by a preset frequency.
Preferably, before the step of calculating the value of the ammonia addition frequency of the corresponding metering pump at the ammonia addition position according to the variation of the flow rate, the method comprises the following steps:
calculating the target conductivity of the liquid at the ammonia adding position according to the target PH value of the liquid at the ammonia adding position;
and calculating the target ammonia concentration of the liquid at the ammonia adding position according to the calculated target conductivity.
Preferably, the formula for calculating the target conductivity of the ammonia-added liquid according to the target PH value of the ammonia-added liquid is as follows:
PH＝A+lgDD；
wherein PH is a target PH value of the liquid at the ammonia adding position, DD is a target conductivity of the liquid at the ammonia adding position, and A is a PH constant.
Preferably, before the step of calculating the value of the ammonia addition frequency of the corresponding metering pump at the ammonia addition position according to the variation of the flow rate, the method comprises the following steps:
and calculating the flow variation of the metering pump at different ammoniating frequencies and different strokes and the flow variation of the metering pump at each increase of the ammoniating frequency at a fixed stroke by a preset frequency according to the concentration of the ammonia solution in the ammonia dissolving medicine tank, and storing the flow variation.
Preferably, after the step of obtaining the flow rate of the liquid at the ammonia adding position and judging whether the variation of the flow rate is larger than a preset threshold, the method includes:
and if the variable quantity of the flow is smaller than or equal to a preset threshold value, automatically adjusting the ammonia adding frequency of the metering pump according to a specific conductivity meter at the ammonia adding position so as to adjust the PH value of the boiler feed water to the PH value corresponding to the target conductivity.
Preferably, the step of automatically adjusting the ammonia adding frequency of the metering pump according to the specific conductivity meter at the ammonia adding position comprises the following steps:
acquiring the conductivity of the liquid at the ammonia adding position through a specific conductivity meter, and judging the magnitude of the conductivity and a preset target conductivity;
if the conductivity is greater than the target conductivity, reducing the ammonia adding frequency of the metering pump;
and if the conductivity is smaller than the target conductivity, increasing the ammonia adding frequency of the metering pump.
Preferably, the ammonia adding position comprises a condensate water refined mother pipe position and a feed pump inlet pipeline position, the target pH value of the condensate water refined mother pipe position is 8.8-9.3, and the target pH value of the feed pump inlet pipeline position is 9.2-9.6.
In addition, in order to achieve the above object, the present invention further provides a device for adjusting PH of boiler feed water, comprising: the device comprises a memory, a processor and a program for adjusting the pH value of the boiler feed water, wherein the program for adjusting the pH value of the boiler feed water is stored in the memory and can run on the processor, and when the program for adjusting the pH value of the boiler feed water is executed by the processor, the method for adjusting the pH value of the boiler feed water comprises the steps of any one of the methods for adjusting the pH value of the boiler feed water.
Further, to achieve the above object, the present invention provides a computer-readable storage medium having stored thereon a program for adjusting the PH of boiler feed water, which when executed by a processor, implements the steps of the method for adjusting the PH of boiler feed water as described in any one of the above.
The method comprises the steps of obtaining the flow of liquid at an ammoniation part, and judging whether the variable quantity of the flow is larger than a preset threshold value or not; if so, calculating an ammonia adding frequency value of the metering pump corresponding to the ammonia adding position according to the variable quantity of the flow; and adjusting the ammonia adding frequency of the metering pump according to the calculated ammonia adding frequency value so as to enable the change range of the PH value of the boiler feed water to be in a preset range. Through the implementation mode, when the liquid flow at the ammoniating position is detected to be larger than the preset threshold value, the ammoniating frequency value of the metering pump is determined through the flow variation, so that the time delay caused by independently adopting a specific conductance meter to adjust the ammoniating frequency is avoided, the accuracy of the PH value of boiler feed water is effectively improved, and the PH value is ensured to be kept in a normal range.
Drawings
FIG. 1 is a schematic structural diagram of a device for adjusting the pH of feed water for a boiler according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for adjusting the pH of boiler feed water according to a first embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a method for adjusting the pH of boiler feed water according to a second embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention is applied to a boiler water supply system of a power plant, the pH value of the boiler water supply system of the power plant is improved by adding ammonia into water (condensed water), thus effectively avoiding corrosion and scaling of the boiler, and equipment and pipelines of the systems of water supply, condensed water, drainage and the like are protected by utilizing the volatility of the ammonia. Therefore, a generator set water supply and ammonia adding system is arranged in a power plant boiler water supply system, and comprises a liquid ammonia steel cylinder, a condensed water ammonia solution tank, a water supply ammonia solution tank, a condensed water ammonia metering pump, a water supply ammonia metering pump, a boiler water supply PH value adjusting device and the like. Wherein, the liquid ammonia steel bottle is connected with condensate ammonia solution case or feed water ammonia solution case, through adding liquid ammonia and water to ammonia solution case, the ammonia solution of default proportion is disposed, condensate ammonia metering pump and feed water ammonia metering pump are connected with condensate ammonia solution case and feed water ammonia solution case respectively, condensate ammonia metering pump and feed water ammonia metering pump all are connected with the adjusting device of boiler feed water pH value, the frequency of adding ammonia of adjusting device control condensate ammonia metering pump and feed water ammonia metering pump through boiler feed water pH value, add appropriate amount ammonia solution in to the water supply system, thereby the pH value in the control water supply system.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a device for adjusting the PH of boiler feed water according to an embodiment of the present invention.
The adjusting device for the pH value of the boiler feed water can be a PC (personal computer), and can also be terminal equipment such as a smart phone, a tablet personal computer and a portable computer. As shown in fig. 1, the adjusting means may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
It will be appreciated by those skilled in the art that the configuration of the adjustment device shown in fig. 1 does not constitute a limitation of the adjustment device and may include more or less components than those shown, or some components in combination, or a different arrangement of components.
As shown in FIG. 1, the memory 1005, which is a type of computer storage medium, may include an operating system, a network communication module, a user interface module, and a program for adjusting the pH of the boiler feedwater.
In the terminal shown in FIG. 1, the processor 1001 may be configured to invoke an adjustment routine for the boiler feedwater pH stored in the memory 1005 and perform the following operations:
acquiring the flow of liquid at an ammoniation part, and judging whether the variable quantity of the flow is greater than a preset threshold value or not;
if so, calculating an ammonia adding frequency value of the metering pump corresponding to the ammonia adding position according to the variable quantity of the flow;
and adjusting the ammonia adding frequency of the metering pump according to the calculated ammonia adding frequency value so as to enable the change range of the PH value of the boiler feed water to be in a preset range.
Further, the processor 1001 may invoke the adjustment routine for the boiler feedwater PH value stored in the memory 1005, and also perform the following operations:
the calculation formula for calculating the value of the ammoniation frequency of the metering pump corresponding to the position of ammoniation according to the variable quantity of the flow is as follows:
F＝C1×Q/(C2×B)；
wherein F is the ammoniation frequency of the metering pump, C1Is the target ammonia concentration of the liquid at the point of ammonia addition, Q is the amount of change in the flow rate of the liquid at the point of ammonia addition, C2The concentration of the ammonia solution in the ammonia dissolving medicine box is shown, and B is the flow variation of the metering pump when the ammonia adding frequency of the metering pump is increased by a preset frequency.
Further, the processor 1001 may invoke the adjustment routine for the boiler feedwater PH value stored in the memory 1005, and also perform the following operations:
calculating the target conductivity of the liquid at the ammonia adding position according to the target PH value of the liquid at the ammonia adding position;
and calculating the target ammonia concentration of the liquid at the ammonia adding position according to the calculated target conductivity.
Further, the processor 1001 may invoke the adjustment routine for the boiler feedwater PH value stored in the memory 1005, and also perform the following operations:
the calculation formula for calculating the target conductivity of the liquid at the ammonia adding position according to the target PH value of the liquid at the ammonia adding position is as follows:
PH＝A+lgDD；
wherein PH is a target PH value of the liquid at the ammonia adding position, DD is a target conductivity of the liquid at the ammonia adding position, and A is a PH constant.
Further, the processor 1001 may invoke the adjustment routine for the boiler feedwater PH value stored in the memory 1005, and also perform the following operations:
and calculating the flow variation of the metering pump at different ammoniating frequencies and different strokes and the flow variation of the metering pump at each increase of the ammoniating frequency at a fixed stroke by a preset frequency according to the concentration of the ammonia solution in the ammonia dissolving medicine tank, and storing the flow variation.
Further, the processor 1001 may invoke the adjustment routine for the boiler feedwater PH value stored in the memory 1005, and also perform the following operations:
and if the variable quantity of the flow is smaller than or equal to a preset threshold value, automatically adjusting the ammonia adding frequency of the metering pump according to a specific conductivity meter at the ammonia adding position so as to adjust the PH value of the boiler feed water to the PH value corresponding to the target conductivity.
Further, the processor 1001 may invoke the adjustment routine for the boiler feedwater PH value stored in the memory 1005, and also perform the following operations:
acquiring the conductivity of the liquid at the ammonia adding position through a specific conductivity meter, and judging the magnitude of the conductivity and a preset target conductivity;
if the conductivity is greater than the target conductivity, reducing the ammonia adding frequency of the metering pump;
and if the conductivity is smaller than the target conductivity, increasing the ammonia adding frequency of the metering pump.
Further, the processor 1001 may invoke the adjustment routine for the boiler feedwater PH value stored in the memory 1005, and also perform the following operations:
the ammonia adding part comprises a mother pipe part and a water supply pump inlet pipeline part, wherein the mother pipe part is subjected to condensate polishing, the target pH value of the mother pipe part is 8.8-9.3, and the target pH value of the water supply pump inlet pipeline part is 9.2-9.6.
The specific embodiment of the device for adjusting the pH value of the boiler feed water is basically the same as the following embodiments of the method for adjusting the pH value of the boiler feed water, and the detailed description is omitted here.
Referring to fig. 2, fig. 2 is a schematic flow chart of a method for adjusting the PH value of boiler feed water according to a first embodiment of the present invention, and the method for adjusting the PH value of boiler feed water includes:
step S10, the flow of the liquid at the ammonia adding position is obtained, and whether the variation of the flow is larger than a preset threshold value or not is judged.
When the boiler water supply system of the power plant works, the water supply and ammonia adding system of the generator set is also in a working state, the flow of liquid at an ammonia adding position needs to be monitored in real time at the moment, flow values at different moments are obtained according to preset frequency, the flow variation is calculated according to the flow at the current moment and the flow at the previous moment, and whether the flow variation is larger than a preset threshold value is judged. The preset frequency here may be 1 second, 2 seconds, 3 seconds, 5 seconds, etc., and the preset threshold may be 10m/h, 20m/h, 30m/h, 50m/h, etc., which may be set according to specific situations, and the present embodiment is not limited.
It should be noted that there may be one or more ammonia adding positions in the water supply ammonia adding system of the generator set, and the metering pump at each ammonia adding position is connected with the adjusting device respectively and independently controlled. In the embodiment, ammonia is added to the preferred condensed water and feed water, so that the ammonia adding position comprises a mother pipe position after the condensed water is refined and a feed water pump inlet pipeline position, the target pH value of the mother pipe position after the condensed water is refined is 8.8-9.3, and the target pH value of the feed water pump inlet pipeline position is 9.2-9.6.
And step S20, if yes, calculating an ammonia adding frequency value of the metering pump corresponding to the ammonia adding position according to the flow variation.
Determining whether the flow variation is larger than a preset threshold value or not according to the flow variation and the size of the preset threshold value, and if the flow variation is larger than the preset threshold value, calculating an ammonia adding frequency value of a metering pump corresponding to an ammonia adding position according to the flow variation; and if the variable quantity of the flow is smaller than or equal to the preset threshold value, determining the ammonia adding frequency value of the metering pump corresponding to the ammonia adding position according to the original specific conductance table.
Specifically, the formula for calculating the value of the ammonia addition frequency of the metering pump corresponding to the ammonia addition position according to the variation of the flow rate is as follows:
F＝C1×Q/(C2×B)；(1)
wherein F is the ammoniation frequency of the metering pump, C1Is the target ammonia concentration of the liquid at the point of ammonia addition, Q is the amount of change in the flow rate of the liquid at the point of ammonia addition, C2The concentration of the ammonia solution in the ammonia dissolving medicine box is shown, and B is the flow variation of the metering pump when the ammonia adding frequency of the metering pump is increased by a preset frequency.
Before the calculation is carried out by adopting the formula (1), the method comprises the following steps:
in step S101, a target conductivity of the liquid at the ammonia addition site is calculated from a target pH value of the liquid at the ammonia addition site.
Specifically, the calculation formula for calculating the target conductivity of the liquid at the ammonia addition position according to the target PH value of the liquid at the ammonia addition position is as follows:
PH＝A+lgDD；(2)
wherein PH is a target PH value of the liquid at the ammonia addition site, DD is a target conductivity of the liquid at the ammonia addition site, A is a constant PH value, and A is preferably 8.57.
And step S102, calculating the target ammonia concentration of the liquid at the ammonia adding position according to the calculated target conductivity.
After the target conductivity is obtained by the above formula (2), the target ammonia concentration corresponding to the target conductivity is calculated from the conversion relationship between the conductivity and the ammonia concentration. Specifically, the calculation formula for calculating the target ammonia concentration of the liquid at the ammonia addition position according to the calculated target conductivity is as follows:
C1＝(13.2DD+62.7DD)×10-3；(3)
wherein, C1DD is the target ammonia concentration of the liquid at the point of ammonia addition and DD is the target conductivity of the liquid at the point of ammonia addition.
According to the above formulas (1) to (3), the value F of the ammoniation frequency of the metering pump corresponding to the position of ammoniation can be calculated.
And step S30, adjusting the ammonia adding frequency of the metering pump according to the calculated ammonia adding frequency value so as to enable the change range of the PH value of the boiler feed water to be in a preset range.
After the ammonia adding frequency value is obtained, the ammonia adding frequency of the metering pump is adjusted according to the ammonia adding frequency value, so that the ammonia adding frequency of the metering pump can be directly adjusted according to the flow value when the liquid flow at the ammonia adding position is greatly changed. For example, if the liquid flow at the ammonia adding position is decreased by more than a preset threshold or increased by more than a preset threshold, the ammonia adding frequency of the metering pump is calculated by adopting the flow variation, so that the timely adjustment of the PH value of the boiler feed water is realized.
It should be noted that, before calculating the ammonia adding frequency value F of the metering pump corresponding to the ammonia adding position by using the above formulas (1) to (3), the flow variation of the metering pump at different ammonia adding frequencies and different strokes and the flow variation of the metering pump at each increase of the ammonia adding frequency by the preset frequency during the fixed stroke are calculated according to the ammonia solution concentration in the ammonia dissolving tank, and stored in the preset storage space or the PID adjusting module for adjusting the boiler feed water PH value, so that the PID adjusting module can adjust these values to adjust the boiler feed water PH value.
In this embodiment, the flow change of the liquid at the ammonia addition position is monitored, and the ammonia addition frequency of the metering pump is calculated by adopting the flow change under the condition of large flow change, so that the timely adjustment of the PH value of the boiler feed water is realized, and the situation that the PH is not adjusted timely due to time delay and exceeds a normal range is avoided.
Further, referring to fig. 3, fig. 3 is a schematic flow chart of a second embodiment of the method for adjusting the PH value of boiler feed water according to the present invention, and based on the embodiment shown in fig. 2, after the step of obtaining the flow rate of the liquid at the ammonia adding position and determining whether the variation of the flow rate is greater than the preset threshold, the method includes:
and step S40, if the variable quantity of the flow is smaller than or equal to a preset threshold value, automatically adjusting the ammonia adding frequency of the metering pump according to the specific conductivity meter at the ammonia adding position, so that the PH value of the boiler feed water is adjusted to the PH value corresponding to the target conductivity.
When the variable quantity of the flow is smaller than or equal to the preset threshold value, the ammonia adding frequency of the metering pump can be automatically adjusted according to the specific conductance meter at the ammonia adding position. The specific conductivity meter automatically adjusts the conductivity of the liquid at the ammonia adding position to the target conductivity according to the target conductivity set by a user, so that the ammonia adding frequency of the metering pump is controlled for adjustment.
Specifically, the step of automatically adjusting the ammonia addition frequency of the metering pump according to the specific conductivity meter at the ammonia addition position comprises the following steps:
step S401, acquiring the conductivity of the liquid at the ammonia adding position through a specific conductivity meter, and judging the magnitude of the conductivity and a preset target conductivity.
Before the specific conductivity meter works, a user sets the target conductivity of the ammonia adding position, the specific conductivity meter obtains the conductivity of liquid at the ammonia adding position in real time, the obtained conductivity is compared with the target conductivity, and the conductivity is judged to be larger than the preset target conductivity. According to the judgment result, step S402 or S403 is executed.
And S402, if the conductivity is larger than the target conductivity, reducing the ammonia adding frequency of the metering pump.
And S403, if the conductivity is smaller than the target conductivity, increasing the ammonia adding frequency of the metering pump.
In the process of regulating the ammonia adding frequency of the metering pump by using the specific conductivity meter, the regulating time can be set according to the requirement of a user, and if the set regulating time is short, namely the time for regulating the conductivity of the liquid to the target conductivity is short, the ammonia adding frequency of the metering pump is larger relative to the conductivity of the same liquid.
In the embodiment, the dynamic adjustment of the PH value of the boiler feed water is realized by monitoring the conductivity of the liquid at the ammonia adding position and adjusting the ammonia adding frequency of the metering pump by using the specific conductivity meter under the condition of small flow change.
In addition, an embodiment of the present invention further provides a computer-readable storage medium, where a program for adjusting a PH value of boiler feed water is stored, and when executed by a processor, the program for adjusting a PH value of boiler feed water implements the following operations:
acquiring the flow of liquid at an ammoniation part, and judging whether the variable quantity of the flow is greater than a preset threshold value or not;
if so, calculating an ammonia adding frequency value of the metering pump corresponding to the ammonia adding position according to the variable quantity of the flow;
and adjusting the ammonia adding frequency of the metering pump according to the calculated ammonia adding frequency value so as to enable the change range of the PH value of the boiler feed water to be in a preset range.
Further, the adjustment program of the boiler feed water PH value is executed by the processor to realize the following operations:
the calculation formula for calculating the value of the ammoniation frequency of the metering pump corresponding to the position of ammoniation according to the variable quantity of the flow is as follows:
F＝C1×Q/(C2×B)；
wherein F is the ammoniation frequency of the metering pump, C1Is the target ammonia concentration of the liquid at the point of ammonia addition, Q is the amount of change in the flow rate of the liquid at the point of ammonia addition, C2The concentration of the ammonia solution in the ammonia dissolving medicine box is shown, and B is the flow variation of the metering pump when the ammonia adding frequency of the metering pump is increased by a preset frequency.
Further, the adjustment program of the boiler feed water PH value is executed by the processor to realize the following operations:
calculating the target conductivity of the liquid at the ammonia adding position according to the target PH value of the liquid at the ammonia adding position;
and calculating the target ammonia concentration of the liquid at the ammonia adding position according to the calculated target conductivity.
Further, the adjustment program of the boiler feed water PH value is executed by the processor to realize the following operations:
the calculation formula for calculating the target conductivity of the liquid at the ammonia adding position according to the target PH value of the liquid at the ammonia adding position is as follows:
PH＝A+lgDD；
wherein PH is a target PH value of the liquid at the ammonia adding position, DD is a target conductivity of the liquid at the ammonia adding position, and A is a PH constant.
Further, the adjustment program of the boiler feed water PH value is executed by the processor to realize the following operations:
and calculating the flow variation of the metering pump at different ammoniating frequencies and different strokes and the flow variation of the metering pump at each increase of the ammoniating frequency at a fixed stroke by a preset frequency according to the concentration of the ammonia solution in the ammonia dissolving medicine tank, and storing the flow variation.
Further, the adjustment program of the boiler feed water PH value is executed by the processor to realize the following operations:
and if the variable quantity of the flow is smaller than or equal to a preset threshold value, automatically adjusting the ammonia adding frequency of the metering pump according to a specific conductivity meter at the ammonia adding position so as to adjust the PH value of the boiler feed water to the PH value corresponding to the target conductivity.
Further, the adjustment program of the boiler feed water PH value is executed by the processor to realize the following operations:
acquiring the conductivity of the liquid at the ammonia adding position through a specific conductivity meter, and judging the magnitude of the conductivity and a preset target conductivity;
if the conductivity is greater than the target conductivity, reducing the ammonia adding frequency of the metering pump;
and if the conductivity is smaller than the target conductivity, increasing the ammonia adding frequency of the metering pump.
Further, the adjustment program of the boiler feed water PH value is executed by the processor to realize the following operations:
the ammonia adding part comprises a mother pipe part and a water supply pump inlet pipeline part, wherein the mother pipe part is subjected to condensate polishing, the target pH value of the mother pipe part is 8.8-9.3, and the target pH value of the water supply pump inlet pipeline part is 9.2-9.6.
The specific embodiment of the computer-readable storage medium of the present invention is substantially the same as the embodiments of the method for adjusting the PH of boiler feed water, and will not be described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The method for adjusting the pH value of the boiler feed water is characterized by comprising the following steps of:
acquiring the flow of liquid at an ammoniation part, and judging whether the variable quantity of the flow is greater than a preset threshold value or not;
if so, calculating an ammonia adding frequency value of the metering pump corresponding to the ammonia adding position according to the variable quantity of the flow;
and adjusting the ammonia adding frequency of the metering pump according to the calculated ammonia adding frequency value so as to enable the change range of the PH value of the boiler feed water to be in a preset range.
2. The method for adjusting the PH of boiler feed water according to claim 1, wherein the formula for calculating the value of the ammonia addition frequency of the metering pump corresponding to the ammonia addition position according to the variation of the flow rate is as follows:
F＝C1×Q/(C2×B)；
wherein F is the ammoniation frequency of the metering pump, C1Is the target ammonia concentration of the liquid at the point of ammonia addition, Q is the amount of change in the flow rate of the liquid at the point of ammonia addition, C2The concentration of the ammonia solution in the ammonia dissolving medicine box is shown, and B is the flow variation of the metering pump when the ammonia adding frequency of the metering pump is increased by a preset frequency.
3. The method for adjusting the PH of boiler feed water according to claim 2, wherein before the step of calculating the value of the frequency of the added ammonia of the corresponding metering pump at the ammonia adding position according to the variation of the flow rate, the method comprises:
calculating the target conductivity of the liquid at the ammonia adding position according to the target PH value of the liquid at the ammonia adding position;
and calculating the target ammonia concentration of the liquid at the ammonia adding position according to the calculated target conductivity.
4. The method for adjusting the pH of boiler feed water according to claim 3, wherein the calculation formula for calculating the target conductivity of the liquid at the ammonia addition site based on the target pH of the liquid at the ammonia addition site is:
PH＝A+lgDD；
wherein PH is a target PH value of the liquid at the ammonia adding position, DD is a target conductivity of the liquid at the ammonia adding position, and A is a PH constant.
5. The method for adjusting the PH of boiler feed water according to claim 2, wherein before the step of calculating the value of the frequency of the added ammonia of the corresponding metering pump at the ammonia adding position according to the variation of the flow rate, the method comprises:
and calculating the flow variation of the metering pump at different ammoniating frequencies and different strokes and the flow variation of the metering pump at each increase of the ammoniating frequency at a fixed stroke by a preset frequency according to the concentration of the ammonia solution in the ammonia dissolving medicine tank, and storing the flow variation.
6. The method for adjusting the pH value of boiler feed water according to claim 1, wherein after the step of obtaining the flow rate of the liquid at the ammonia adding position and judging whether the variation of the flow rate is larger than a preset threshold value, the method comprises the following steps:
and if the variable quantity of the flow is smaller than or equal to a preset threshold value, automatically adjusting the ammonia adding frequency of the metering pump according to a specific conductivity meter at the ammonia adding position so as to adjust the PH value of the boiler feed water to the PH value corresponding to the target conductivity.
7. The method of adjusting the PH of boiler feed water according to claim 6, wherein the step of automatically adjusting the dosing frequency of the dosing pump according to the specific conductivity meter at the dosing site comprises:
acquiring the conductivity of the liquid at the ammonia adding position through a specific conductivity meter, and judging the magnitude of the conductivity and a preset target conductivity;
if the conductivity is greater than the target conductivity, reducing the ammonia adding frequency of the metering pump;
and if the conductivity is smaller than the target conductivity, increasing the ammonia adding frequency of the metering pump.
8. The method for adjusting the pH value of the boiler feed water according to claim 1, wherein the ammonia adding position comprises a condensate water refined mother pipe position and a feed water pump inlet pipeline position, the target pH value of the condensate water refined mother pipe position is 8.8-9.3, and the target pH value of the feed water pump inlet pipeline position is 9.2-9.6.
9. A device for adjusting the pH value of boiler feed water, which is characterized by comprising: a memory, a processor and a program for adjusting the PH of boiler feed water stored in the memory and operable on the processor, the program for adjusting the PH of boiler feed water being executed by the processor to perform the steps of the method for adjusting the PH of boiler feed water according to any one of claims 1 to 8.
10. A computer-readable storage medium on which a program for adjusting the PH of boiler feed water is stored, wherein the program for adjusting the PH of boiler feed water, when executed by a processor, implements the steps of the method for adjusting the PH of boiler feed water according to any one of claims 1 to 8.
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