CN115541676A - Water sample constant temperature device for detecting pH and conductivity of cold water in power plant - Google Patents
Water sample constant temperature device for detecting pH and conductivity of cold water in power plant Download PDFInfo
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- CN115541676A CN115541676A CN202211269397.5A CN202211269397A CN115541676A CN 115541676 A CN115541676 A CN 115541676A CN 202211269397 A CN202211269397 A CN 202211269397A CN 115541676 A CN115541676 A CN 115541676A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 239000004065 semiconductor Substances 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 abstract description 7
- 238000004458 analytical method Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 13
- 239000000498 cooling water Substances 0.000 description 9
- 230000001105 regulatory effect Effects 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 3
- 238000001139 pH measurement Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/302—Electrodes, e.g. test electrodes; Half-cells pH sensitive, e.g. quinhydron, antimony or hydrogen electrodes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B21/00—Machines, plants or systems, using electric or magnetic effects
- F25B21/02—Machines, plants or systems, using electric or magnetic effects using Peltier effect; using Nernst-Ettinghausen effect
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Thermal Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention relates to a water sample constant temperature device for detecting pH and conductivity of cold water in a power plant, belonging to the field of chemical analysis devices for water quality of the power plant. One end of the water sample flow control device is connected with a cold water tank in the generator through a pipeline, the other end of the water sample flow control device is sequentially connected with an air-cooled radiator, a heat exchanger, a semiconductor electric refrigerator, a conductivity electrode cup and a pH measuring electrode cup through pipelines, the pH measuring electrode cup is connected with a liquid storage tank through a heat exchanger through a pipeline, the liquid storage tank is sequentially connected with a diaphragm pump, a check valve and the cold water tank in the generator through pipelines, a conductivity meter is connected with the conductivity electrode cup, and a pH meter is connected with the pH measuring electrode cup. The advantage is that the water sample has reduced the regulation and control degree of difficulty of water sample temperature through tertiary cooling mode, has carried out abundant recycle to cold energy, adopts closed circulation detecting system, has prolonged the life-span of little alkalization system, has realized the zero release and has detected, has accomplished green energy-concerving and environment-protective.
Description
Technical Field
The invention belongs to the field of chemical analysis devices for water quality of power plants, and particularly relates to a water sample constant temperature device for detecting pH and conductivity of cold water in a power plant.
Background
In recent years, along with the investment and operation of large-capacity, subcritical and supercritical generator sets, in order to ensure the safe operation of the generator set equipment, GB/T12145-2008 'steam quality of thermal generator sets and steam power equipment' provides quality standard provisions for the cold water in the generator, so as to ensure the stable operation of the generator set, and copper corrosion can occur if the pH value is low.
The inner cooling water is subjected to micro-alkalization treatment by adopting special ion exchange resin generally, the pH value of the inner cooling water after measurement is controlled within a standard range through meter measurement, and the water quality control standard is shown in table 1.
TABLE 1 Water quality control standards
Because the water volume of the internal cooling water is small and cannot be discharged and measured continuously, most power plants are installed and measured on site without a cooling system, the pH measurement result of the water quality is greatly influenced by the temperature, the pH measurement value in the water quality standard refers to the measurement result when the temperature of a water sample is 25 ℃, the temperature of the internal cooling water in the power plants is usually more than 40 ℃, a great error can be generated by direct measurement under the condition that the water sample is not cooled, the continuous measurement and supervision effect on the water quality is lost, and the safe and stable operation of a generator set can be damaged seriously.
Disclosure of Invention
The invention provides a water sample thermostat for detecting pH and conductivity of cold water in a power plant, which aims to solve the problems that under the condition that a water sample is not cooled, direct measurement can generate large errors, the continuous measurement and supervision effect on water quality is lost, and the safe and stable operation of a generator set can be seriously damaged.
The technical scheme includes that the device comprises a water sample flow control device, an air-cooled radiator, a heat exchanger, a semiconductor electric refrigerator, a conductivity electrode cup, a pH measuring electrode cup, a liquid storage tank, a diaphragm pump, a check valve, a conductivity meter, a pH meter and a generator internal cold water tank, wherein one end of the water sample flow control device is connected with the generator internal cold water tank through a pipeline, the other end of the water sample flow control device is sequentially connected with the air-cooled radiator, the heat exchanger, the semiconductor electric refrigerator, the conductivity electrode cup and the pH measuring electrode cup through pipelines, the pH measuring electrode cup is connected with the liquid storage tank through the heat exchanger through a pipeline, the liquid storage tank is sequentially connected with the diaphragm pump, the check valve and the generator internal cold water tank through pipelines, the conductivity meter is connected with the conductivity electrode cup, and the pH meter is connected with the pH measuring electrode cup.
The water sample flow control device comprises a regulating valve and a flowmeter, wherein one end of the regulating valve is connected with a cold water tank in a generator, the other end of the regulating valve is connected with the flowmeter, the other end of the flowmeter is connected with an air-cooled radiator, the water sample flow is 100mL/min, and the water sample pressure is 0-0.2 MPa.
The water sample detection constant temperature in the conductance electrode cup and the pH measuring electrode cup is 25 ℃.
The volume of the liquid storage tank is 20L.
The flow rate of the diaphragm pump is 0-10L/min.
The conductance measuring electrode of the conductance meter is arranged in a sealed conductance electrode cup, and the measuring range of the conductance meter is 0-100 uS/cm.
The pH measuring electrode of the pH meter is arranged in a pH measuring electrode cup, and the range of the pH meter is 0-14.
The invention has the advantages that the water sample is cooled in a three-stage manner, the difficulty in adjusting and controlling the temperature of the water sample is reduced, the temperature of the water sample of the internal cooling water is reduced from 40-50 ℃ to 25 ℃, the detected water sample at 25 ℃ is utilized to exchange heat with the water sample to be detected, the cold energy is fully recycled, and the working power of semiconductor electric refrigeration is reduced. The closed circulation detection system is adopted, the detected water sample of the inner cooling water is recycled, the processing workload of the inner cooling water micro-alkalization processing system is reduced, the service life of the micro-alkalization system is prolonged, the system is designed into the closed circulation detection system, zero emission detection is realized, and green, energy saving and environmental protection are realized.
Drawings
FIG. 1 is a functional block diagram of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
Detailed Description
Referring to fig. 1, the device comprises a water sample flow control device 1, an air-cooled radiator 2, a heat exchanger 3, a semiconductor electric refrigerator 4, a conductivity electrode cup 5, a pH measuring electrode cup 6, a liquid storage tank 7, a diaphragm pump 8, a check valve 9, a conductivity meter 10, a pH meter 11 and a generator internal cold water tank 12, wherein one end of the water sample flow control device 1 is connected with the generator internal cold water tank 12 through a pipeline, the other end of the water sample flow control device is sequentially connected with the air-cooled radiator 2, the heat exchanger 3, the semiconductor electric refrigerator 4, the conductivity electrode cup 5 and the pH measuring electrode cup 6 through pipelines, the pH measuring electrode cup 6 is connected with the liquid storage tank 7 through the heat exchanger 3 through a pipeline, the liquid storage tank 7 is sequentially connected with the diaphragm pump 8, the check valve 9 and the generator internal cold water tank 12 through pipelines, the conductivity meter 10 is connected with the conductivity electrode cup 5, and the pH meter 11 is connected with the pH measuring electrode cup 6.
Referring to fig. 2, the water sample flow control device 1 of the present invention comprises a regulating valve 101 and a flow meter 102, wherein one end of the regulating valve 101 is connected with the cold water tank 12 in the generator, the other end is connected with the flow meter 102, the other end of the flow meter 102 is connected with the air cooling radiator 2, the water sample flow is 100mL/min, and the water sample pressure is 0-0.2 MPa.
The constant temperature for detecting the water samples in the conductive electrode cup 5 and the pH measuring electrode cup 6 is 25 ℃.
The volume of the liquid storage tank 7 is 20L.
The flow rate of the diaphragm pump 8 is 0-10L/min.
The conductance measuring electrode 1001 of the conductance meter 10 of the present invention is placed in a sealed conductance electrode cup 5, and the measuring range of the conductance meter is 0 to 100uS/cm.
The pH measuring electrode 1101 of the pH meter 11 is arranged in the pH measuring electrode cup 6, and the range of the pH meter is 0-14.
The technical parameters of the invention are as follows: water sample flow rate: 100mL/min, water sample pressure: 0-0.2 MPa, water sample temperature: 40-60 ℃, and detecting the constant temperature of a water sample: 25 ℃, diaphragm pump flow: 0-10L/min, volume of liquid storage tank: 20L, measuring range of the conductivity meter: 0-100 uS/cm, pH meter range: 0 to 14.
Principle of operation
The temperature of a cold water tank 12 in a water sample self-generating machine is between 40 and 60 ℃, the flow is kept at 100mL/min through a flow regulating valve 101, the flow is guaranteed to be measured, most of heat is dissipated through a primary air-cooled radiator 2, the water sample is sent to a heat exchanger 3 to be further subjected to heat exchange and cooling through a waste water sample at 25 ℃ for secondary cooling, the temperature of the water sample is further close to 25 ℃, the water sample is subjected to constant-temperature tertiary cooling through an electric refrigerator 4 to achieve the target of 25 ℃, in order to prevent permeation interference of pH electrode reference liquid KOH, the water sample at the constant temperature of 25 ℃ sequentially passes through a conductivity electrode cup and a pH electrode cup, the used water sample is sent to the heat exchanger 3 to be subjected to continuous heat exchange with an undetected water sample, the detected water sample is recycled to a liquid storage tank 7 and then is sent to the generator inner box 12 through a diaphragm pump 8, and the recycling of the detected water sample can reduce the load of an inner cold water micro-alkalization system and prolong the service life of the micro-alkalization system. Because the water volume of the cold water tank 12 in the generator is less and only a few cubic meters, the closed circulation mode is adopted, and the water cannot be discharged outwards for a long time, so the measurement is also carried out by adopting the closed circulation measurement mode.
The use method of the invention comprises the following steps:
(1) Flow regulation: the water sample was stabilized at 100mL/min by manually adjusting the valve.
(2) Constant temperature automatic regulation: the water sample is firstly cooled by two stages of air cooling and heat exchanger, and then is automatically regulated by three stages of electric refrigerator to make the temperature of the water sample constant at 25 ℃.
(3) Measuring by using an instrument: in order to prevent the pH electrode reference electrode from being polluted, the conductance measurement is firstly carried out, a closed design is adopted during the conductance measurement to prevent air from entering to influence the measurement result, and then the pH measurement is carried out.
(4) And (3) recovering waste liquid: the measured water sample is discharged into a liquid storage tank and pumped back to an internal cooling water system by a pump, a high liquid level detection switch and a low liquid level detection switch are arranged in the tank, the pump is started when the liquid level reaches the high liquid level, and the pump stops running when the liquid level reaches the low liquid level, so that the intermittent operation mode is adopted for prolonging the service life.
(5) The control system comprises: and adjusting the rotating speed of a first-stage air-cooled fan according to the temperature of the incoming sample, controlling the outlet temperature of the semiconductor electric refrigerator to be kept at 25 ℃, controlling the diaphragm pump to operate, and keeping the liquid level of the liquid storage tank in a set interval.
(6) Measuring by using an instrument: and continuously measuring the conductivity meter and the pH meter and outputting the measurement result to a DCS (distributed control system) of the power plant for monitoring the change of the quality of the internal cooling water.
Claims (7)
1. The utility model provides a be used for interior cold water pH of power plant, conductivity detection water sample constant temperature equipment which characterized in that: the device comprises a water sample flow control device, an air-cooled radiator, a heat exchanger, a semiconductor electric refrigerator, a conductivity electrode cup, a pH measuring electrode cup, a liquid storage tank, a diaphragm pump, a check valve, a conductivity meter, a pH meter and a generator internal cold water tank, wherein one end of the water sample flow control device is connected with the generator internal cold water tank through a pipeline, the other end of the water sample flow control device is sequentially connected with the air-cooled radiator, the heat exchanger, the semiconductor electric refrigerator, the conductivity electrode cup and the pH measuring electrode cup through pipelines, the pH measuring electrode cup is connected with the liquid storage tank through the pipeline, the liquid storage tank is sequentially connected with the diaphragm pump, the check valve and the generator internal cold water tank through pipelines, the conductivity meter is connected with the conductivity electrode cup, and the pH meter is connected with the pH measuring electrode cup.
2. The water sample thermostat for detecting pH and conductivity of cold water in a power plant as claimed in claim 1, wherein: the water sample flow control device comprises an adjusting valve and a flowmeter, wherein one end of the adjusting valve is connected with a cold water tank in the generator, the other end of the adjusting valve is connected with the flowmeter, the other end of the flowmeter is connected with an air-cooled radiator, the water sample flow is 100mL/min, and the water sample pressure is 0-0.2 MPa.
3. The water sample thermostat for detecting pH and conductivity of cold water in a power plant as claimed in claim 1, wherein: the constant temperature for water sample detection in the conductive electrode cup and the pH measuring electrode cup is 25 ℃.
4. The water sample thermostat for detecting pH and conductivity of cold water in a power plant as claimed in claim 1, wherein: the volume of the liquid storage tank is 20L.
5. The water sample thermostat for detecting pH and conductivity of cold water in a power plant as claimed in claim 1, wherein: the flow rate of the diaphragm pump is 0-10L/min.
6. The water sample thermostat for detecting pH and conductivity of cold water in a power plant as claimed in claim 1, wherein: the conductance measuring electrode of the conductance meter is arranged in a sealed conductance electrode cup, and the measuring range of the conductance meter is 0-100 uS/cm.
7. The water sample thermostat for detecting pH and conductivity of cold water in a power plant as claimed in claim 1, wherein: the pH measuring electrode of the pH meter is arranged in the pH measuring electrode cup, and the measuring range of the pH meter is 0-14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211269397.5A CN115541676A (en) | 2022-10-17 | 2022-10-17 | Water sample constant temperature device for detecting pH and conductivity of cold water in power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211269397.5A CN115541676A (en) | 2022-10-17 | 2022-10-17 | Water sample constant temperature device for detecting pH and conductivity of cold water in power plant |
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| Publication Number | Publication Date |
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| CN115541676A true CN115541676A (en) | 2022-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211269397.5A Pending CN115541676A (en) | 2022-10-17 | 2022-10-17 | Water sample constant temperature device for detecting pH and conductivity of cold water in power plant |
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| CN (1) | CN115541676A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109174225A (en) * | 2018-09-14 | 2019-01-11 | 国网江西省电力有限公司电力科学研究院 | Generator stator cooling water water sample tests pipeline cooling device |
| CN110806428A (en) * | 2019-10-21 | 2020-02-18 | 华电电力科学研究院有限公司 | Special pH measuring device for generator inner cooling water system and working method thereof |
-
2022
- 2022-10-17 CN CN202211269397.5A patent/CN115541676A/en active Pending
Patent Citations (11)
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| CN201417618Y (en) * | 2009-05-07 | 2010-03-03 | 无锡市福曼科技有限公司 | High power cooling module combining air cooling, water cooling and electronic refrigeration |
| CN101907015A (en) * | 2010-07-09 | 2010-12-08 | 江麓机电科技有限公司 | Integrative cooling system of hybrid power excavating machine |
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