CN114839227A - Power station water vapor multi-parameter cooperative measurement system and measurement method - Google Patents
Power station water vapor multi-parameter cooperative measurement system and measurement method Download PDFInfo
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Abstract
The invention belongs to the field of water vapor monitoring of power stations, and relates to a multi-parameter cooperative measurement system and a measurement method for water vapor of a power station, wherein the measurement system comprises a water sample inlet, a water sample outlet, a first conductivity sensor, a cation removal device, a second conductivity sensor, a desalting device, a membrane exchange device and a third conductivity sensor; the water sample inlet is communicated with the cation removing device through the first conductivity sensor; the cation removing device is communicated with the second conductivity sensor and the desalting device respectively; the second conductivity sensor and the desalting device are both connected to the membrane exchange device; the membrane exchange device is communicated with the water sample outlet; and the outlet of the membrane exchange device is communicated with the water sample outlet through a third conductivity sensor. The invention provides a power station water vapor multi-parameter cooperative measurement system and a measurement method, which have accurate measurement results and timely feedback in the measurement process.
Description
Technical Field
The invention belongs to the field of power station water vapor monitoring, and relates to a power station water vapor multi-parameter cooperative measurement system and a measurement method.
Background
The water vapor quality standard of a thermal power plant is an important basis for chemical supervision and also an important means for ensuring the safe and economic operation of power generation equipment. With the continuous operation of high-parameter and large-capacity units and novel water treatment equipment of a thermal power plant, the water vapor quality standard (GB/T12145) of the thermal power plant puts higher requirements on the water vapor quality of the thermal power plant, and has detailed parameter requirements on specific conductivity, hydrogen conductivity, degassed hydrogen conductivity, pH and ammonia content in thermal power water vapor.
For specific conductivity, the measurement of the value has a direct relation with the flow rate of a water sample and the design and compensation mode of a secondary instrument, and the existing measurement mode, such as the use of a domestic instrument, can cause inaccurate measurement results due to the influences of distributed capacitance and temperature compensation.
For the hydrogen conductivity, the measured value of the hydrogen conductivity has a direct relation with the flow rate of a water sample and a used hydrogen ion exchange resin column, the common cation exchange resin is used for removing cations in water, the interference of hydrogen conductivity measurement is large due to the limitation of the self condition of the resin, the measurement is not easy to be accurate, and after the resin fails, the cleaning or replacement of the resin can indirectly cause the measurement of the hydrogen conductivity to be discontinuous, so that the measurement cannot be timely and accurate. And hydrogen conductivity measurement measuring points are numerous, and the workload of manual operation and maintenance is huge.
Common means for degassing hydrogen conductivity include a boiling method and a membrane method. The boiling method has high temperature and high risk, and the accurate conductivity of the degassed hydrogen after compensation can be obtained only by correspondingly compensating the measurement result, which will certainly affect the actual value of the conductivity of the degassed hydrogen. For membrane processes, carbon dioxide in water vapor is relatively low and cannot be completely removed, which also affects the measurement of the electrical conductivity of the degassed hydrogen. Because the carbon dioxide content in the water vapor of the power station is extremely low, the carbon dioxide is difficult to completely remove by a boiling method and a membrane method, and the electrical conductivity of the degassed hydrogen is measured after cations of a water sample are removed by using a cation exchange resin column, so that the problems of hydrogen electrical conductivity measurement exist.
Meanwhile, pH is an important index for controlling corrosion prevention of a water vapor system, but the pH measurement accuracy is poor, especially the pH measurement accuracy of ammonia-containing pure water is worse when the temperature deviates from the standard temperature, the corrosion prevention of the water vapor system equipment can be seriously influenced, the pH electrode needs to be replaced regularly, and the operation and maintenance cost is higher.
The ammonia content of the water vapor system is generally measured by using a nano reagent method, the toxicity of the reagent is high, and the steps are complicated.
In summary, in the existing measurement mode, four water samples are needed for measuring the pH, the specific conductivity, the hydrogen conductivity and the degassed hydrogen conductivity, and due to various problems in the measurement process, the pH, the specific conductivity, the hydrogen conductivity and the degassed hydrogen conductivity are difficult to measure accurately, which affects the safe operation of the thermal equipment.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides the power station water vapor multi-parameter cooperative measurement system and the measurement method which are accurate in measurement result and timely in feedback of the measurement process.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a power station steam multi-parameter measurement system in coordination which characterized in that: the power station water vapor multi-parameter collaborative measurement system comprises a water sample inlet, a water sample outlet, a first conductivity sensor, a cation removal device, a second conductivity sensor, a desalination device, a membrane exchange device and a third conductivity sensor; the water sample inlet is communicated with the cation removal device through the first conductivity sensor; the cation removing device is communicated with the second conductivity sensor and the desalting device respectively; the second conductivity sensor and the desalting device are both connected to the membrane exchange device; the membrane exchange device is communicated with the water sample outlet; and the outlet of the membrane exchange device is communicated with the water sample outlet through a third conductivity sensor.
The cation removing device is a continuous electric regeneration cation exchange device, and the cation exchange resin bag in the cation removing device is dynamically regenerated in real time by using electric regeneration;
The desalting device is an EDI electric desalting system.
The membrane in the membrane exchange device can exchange carbon dioxide, and pure water (carbon dioxide is 0) is used for exchanging carbon dioxide in the water sample to be detected; the removal of the carbon dioxide in the water sample to be detected in the membrane exchange device is ensured by designing the flow velocity at two sides of the membrane exchange device and the exchange flow of the membrane, so that the carbon dioxide in the water sample to be detected in the membrane exchange device is completely removed.
The first conductivity sensor, the second conductivity sensor and the third conductivity sensor are designed to eliminate distributed capacitance, the first conductivity sensor measures specific conductivity, and a non-linear temperature compensation curve of an ammonia condition is used; a second conductivity sensor measures hydrogen conductivity using a non-linear temperature compensation curve for acidic conditions; the third conductivity sensor measures the degassed hydrogen conductivity using a non-linear temperature compensation curve for acidic conditions.
The power station water vapor multi-parameter cooperative measurement method based on the foregoing is characterized in that: the power station water vapor multi-parameter cooperative measurement method comprises the following steps:
1) a water sample to be measured firstly passes through a water sample inlet and then flows into the first conductivity sensor (1) for specific conductivity measurement;
2) After passing through the first conductivity sensor (1), the water enters a cation removal device (2) to remove cations in the water sample;
3) after passing through the cation removal device (2), the water sample is divided into two paths, wherein one path enters the second conductivity sensor (3) for hydrogen conductivity measurement; the other path is used for desalting the water sample through a desalting device (4) to prepare pure water;
4) CO-containing passing through a second conductivity sensor (3) 2 The water sample and the pure water passing through the desalting device (4) are jointly imported into the membrane exchange device (5), and carbon dioxide in the water sample passing through the second conductivity sensor (3) is exchanged into the pure water after passing through the membrane exchange device (5), so that trace carbon dioxide in the water sample can be thoroughly removed;
5) the pure water containing carbon dioxide formed after passing through the membrane exchange device (5) is discharged through a water sample outlet; CO is removed after passing through a membrane exchange device (5) 2 The water sample enters a third conductivity sensor (6), and the conductivity of the degassed hydrogen is measured by the third conductivity sensor (6) and then discharged.
The power station water vapor multi-parameter cooperative measurement method further comprises the following steps after the step 5):
6) and accurately calculating the ammonia content c and the pH value of the water according to the measured data of the specific conductivity and the hydrogen conductivity.
The calculation mode of the ammonia content and the pH value in the water in the step 6) is as follows:
pH＝8.56639+lgDC-lg(a 1 .CC 6 +a 2 .CC 5 +a 3 .CC 4 +a 4 .CC 3 +a 5 .CC 2 +a 6 .CC)
Wherein:
DC is the specific conductivity measured by the first conductivity sensor (1);
CC is the hydrogen conductivity measured by the second conductivity sensor (3);
a 1 to a 6 Are all fitting constants.
The invention has the advantages that:
the invention provides a power station water vapor multi-parameter cooperative measurement system and a measurement method, which have the following advantages:
(1) one water sample and one instrument can simultaneously complete the measurement of 5 indexes. The invention can simultaneously complete the measurement of pH, specific conductivity, hydrogen conductivity, degassed hydrogen conductivity and ammonia content by one instrument for one water sample, has high measurement accuracy, ensures the safe operation of thermal equipment and has obvious energy-saving and consumption-reducing effects.
(2) Non-linear complementary curves under different medium conditions. The conductivity, the hydrogen conductivity and the degassed hydrogen conductivity are measured by respectively using a nonlinear temperature compensation curve under a specific water quality condition, and the measurement accuracy is high;
(3) the electrical regeneration technique replaces the conventional ion exchange technique to measure (degassed) hydrogen conductivity. The electrical regeneration technology is used for measuring the hydrogen conductivity and the degassed hydrogen conductivity, the response speed is high, the measurement interference is less, and the measurement accuracy and the intelligence are improved; the five-in-one highly integrated instrument structure greatly saves space, does not need to replace a resin column and is convenient to maintain.
(4) Can be used as a portable watch. The measuring volume is small, the portable instrument can be used as a portable instrument, and the pH value, the conductivity, the hydrogen conductivity and the degassed hydrogen conductivity of a water sample can be measured off-line or on-line simultaneously.
(5) The degassed hydrogen conductivity measurements can be compared to standard materials. The degassing hydrogen conductivity value can be compared with a standard substance to determine the degassing effect.
(6) It is used at normal temperature and pressure.
The degassing hydrogen conductivity measurement process does not need heating to boiling, the degassing efficiency can reach more than 95%, and the degassing hydrogen conductivity of the water sample can be accurately measured at normal temperature and normal pressure.
(7) The pH measurement accuracy is obviously improved. The pH value and the ammonia content are accurately calculated by using the measured values of the specific conductivity and the hydrogen conductivity, the pH measurement accuracy is high, the pH electrode does not need to be replaced, and the operation and maintenance cost is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a power station water vapor multi-parameter cooperative measurement system provided by the invention;
wherein:
1-a first conductivity sensor; 2-a cation removal unit; 3-a second conductivity sensor; 4-a desalination device; 5-a membrane exchange device; 6-third conductivity sensor.
Detailed Description
Referring to fig. 1, the invention provides a power station water vapor multi-parameter cooperative measurement system, which comprises a water sample inlet, a water sample outlet, a first conductivity sensor 1, a cation removal device 2, a second conductivity sensor 3, a desalination device 4, a membrane exchange device 5 and a third conductivity sensor 6; a water sample inlet is communicated with the cation removing device 2 through the first conductivity sensor 1; the cation removing device 2 is communicated with the second conductivity sensor 3 and the desalting device 4 respectively; the second conductivity sensor 3 and the desalting device 4 are both connected to a membrane exchange device 5; the outlet of the membrane exchange device 5 is communicated with the water sample outlet; the membrane exchange device 5 is communicated with the water sample outlet through a third conductivity sensor 6.
The cation removing device 2 is a continuous electric regeneration cation exchange device, and the cation exchange resin bag in the cation removing device is dynamically regenerated in real time by using electric regeneration.
The desalination apparatus 4 is an EDI electrical desalination system.
The membrane in the membrane exchange device 5 can exchange carbon dioxide, and carbon dioxide in the water sample is completely removed through the membrane exchange device.
The first conductivity sensor 1, the second conductivity sensor 3 and the third conductivity sensor 6 are designed to eliminate distributed capacitance, the first conductivity sensor 1 measures specific conductivity, and a non-linear temperature compensation curve of an ammoniacal condition is used; the second conductivity sensor 3 measures the hydrogen conductivity using a non-linear temperature compensation curve under acidic conditions; the third conductivity sensor 6 measures the degassed hydrogen conductivity using a non-linear temperature compensation curve for acidic conditions.
A power station water vapor multi-parameter cooperative measurement method based on the above records comprises the following steps:
the water sample to be measured firstly passes through the water sample inlet, then flows to the first conductivity sensor 1 to measure the specific conductivity, and then is removed by cationsThe device 2 is divided into two paths after cations in a water sample are removed; one path of water sample enters the membrane exchange device 5 after the hydrogen conductivity is measured by the second conductivity sensor 3, and the other path of water sample enters the membrane exchange device 5 after the anions and cations are removed by the desalting device 4 (pure water is prepared). CO-containing passing through the second conductivity sensor 3 2 The water sample and the pure water passing through the desalting device 4 are jointly converged into the membrane exchange device 5, and carbon dioxide in the water sample passing through the second conductivity sensor 3 is exchanged into the pure water after passing through the membrane exchange device 4, so that trace carbon dioxide in the water sample can be thoroughly removed. The degassed hydrogen conductivity of the water sample after carbon dioxide removal is measured by a third conductivity sensor 6. And accurately calculating the ammonia content and the pH value of the water according to the specific conductivity measured by the first conductivity sensor 1 and the hydrogen conductivity data measured by the second conductivity sensor 3.
The pH value of water vapor of the gas-steam combined cycle power station is generally more than 9.5, the pH value of a water sample after cation removal is less than 4.5, and more than 96 percent of total carbonate (salt) in the water is CO under the pH condition 2 The water sample after hydrogen conductivity measurement enters a membrane exchange device to remove CO in the water sample 2 And measuring the conductivity of the effluent, namely the degassed hydrogen conductivity of the water sample.
Claims (8)
1. The utility model provides a power station steam multi-parameter measurement system in coordination which characterized in that: the power station water vapor multi-parameter collaborative measurement system comprises a water sample inlet, a water sample outlet, a first conductivity sensor (1), a cation removal device (2), a second conductivity sensor (3), a desalination device (4), a membrane exchange device (5) and a third conductivity sensor (6); the water sample inlet is communicated with the cation removal device (2) through the first conductivity sensor (1); the cation removal device (2) is communicated with the second conductivity sensor (3) and the desalting device (4) respectively; the second conductivity sensor (3) and the desalting device (4) are both connected to a membrane exchange device (5); the outlet of the membrane exchange device (5) is communicated with the water sample outlet; and the outlet of the membrane exchange device (5) is communicated with the water sample outlet through a third conductivity sensor (6).
2. The power station water vapor multi-parameter cooperative measurement system according to claim 1, characterized in that: the cation removal device (2) is a continuous electrically regenerative cation exchange device.
3. The power station water vapor multi-parameter cooperative measurement system according to claim 2, characterized in that: the desalination device (4) is an EDI electrical desalination system.
4. The power station water vapor multi-parameter cooperative measurement system according to claim 3, characterized in that: the membrane exchange device (5) is a membrane exchange device capable of exchanging carbon dioxide.
5. The power station water vapor multi-parameter cooperative measurement system according to claim 1, 2, 3 or 4, characterized in that: the first conductivity sensor (1) is used for measuring specific conductivity; a second conductivity sensor (3) for measuring hydrogen conductivity; the third conductivity sensor (6) is used for measuring the degassed hydrogen conductivity.
6. The power station water vapor multi-parameter cooperative measurement method based on the claim 5 is characterized in that: the power station water vapor multi-parameter cooperative measurement method comprises the following steps:
1) a water sample to be measured firstly passes through a water sample inlet and then flows into the first conductivity sensor (1) for specific conductivity measurement;
2) after passing through the first conductivity sensor (1), the water enters a cation removal device (2) to remove cations in the water sample;
3) After passing through the cation removal device (2), the water sample is divided into two paths, wherein one path enters the second conductivity sensor (3) for hydrogen conductivity measurement; the other path is used for desalting the water sample through a desalting device (4) to prepare pure water;
4) CO-containing passing through a second conductivity sensor (3) 2 The water sample and the pure water passing through the desalting device (4) are jointly imported into the membrane exchange device (5), the carbon dioxide in the water sample passing through the second conductivity sensor (3) is exchanged into the pure water after passing through the membrane exchange device (5), and the trace carbon dioxide in the water sample can be thoroughly removedRemoving;
5) the pure water containing carbon dioxide formed after passing through the membrane exchange device (5) is discharged through a water sample outlet; CO is removed after passing through a membrane exchange device (5) 2 The water sample enters a third conductivity sensor (6), and the conductivity of the degassed hydrogen is measured by the third conductivity sensor (6) and then discharged.
7. The power station water vapor multi-parameter cooperative measurement method according to claim 6, characterized in that: the power station water vapor multi-parameter collaborative measurement method further comprises the following steps after the step 5):
6) and accurately calculating the ammonia content c and the pH value of the water according to the measured data of the specific conductivity and the hydrogen conductivity.
8. The power station water vapor multi-parameter cooperative measurement method according to claim 7, characterized in that: the calculation mode of the ammonia content c and the pH value in the water in the step 6) is as follows:
pH＝8.56639+lgDC-lg(a 1 .CC 6 +a 2 .CC 5 +a 3 .CC 4 +a 4 .CC 3 +a 5 .CC 2 +a 6 .CC)
Wherein:
DC is the specific conductivity measured by the first conductivity sensor (1);
CC is the hydrogen conductivity measured by the second conductivity sensor (3);
a 1 to a 6 Are all fitting constants.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115343536A (en) * | 2022-08-23 | 2022-11-15 | 浙江西热利华智能传感技术有限公司 | Power station water vapor multi-parameter cooperative measurement system and method |
| CN115594279A (en) * | 2022-10-31 | 2023-01-13 | 华能景泰热电有限公司（Cn） | Multi-parameter cooperative regulation and control system and method based on calculation type pH |
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2022
- 2022-04-07 CN CN202210360330.6A patent/CN114839227A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115343536A (en) * | 2022-08-23 | 2022-11-15 | 浙江西热利华智能传感技术有限公司 | Power station water vapor multi-parameter cooperative measurement system and method |
| CN115594279A (en) * | 2022-10-31 | 2023-01-13 | 华能景泰热电有限公司（Cn） | Multi-parameter cooperative regulation and control system and method based on calculation type pH |
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