CN111666670A - Method for determining water replenishing rate of circulating system through concentration ratio during impurity removal - Google Patents
Method for determining water replenishing rate of circulating system through concentration ratio during impurity removal Download PDFInfo
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- CN111666670A CN111666670A CN202010474608.3A CN202010474608A CN111666670A CN 111666670 A CN111666670 A CN 111666670A CN 202010474608 A CN202010474608 A CN 202010474608A CN 111666670 A CN111666670 A CN 111666670A
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- water
- ions
- rate
- circulating
- cooling system
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
Abstract
The invention discloses a method for determining the water replenishing rate of a circulating system through concentration ratio when impurities are removed, which can objectively and truly reflect the operating parameters of the circulating water system and timely adjust and investigate problems in operation, thereby accurately controlling the water replenishing rate of the system, reducing the consumption of new water of the system and realizing the effects of energy conservation and emission reduction.
Description
Technical Field
The invention belongs to the field of environmental engineering, and particularly relates to a method for determining the water replenishing rate of a circulating system through concentration ratio when impurities are removed.
Background
Taking steel enterprises as an example, the circulating water cooling system has wide application and is essential to the production of the enterprises. Most of the operation modes are that water after exchanging heat with equipment is conveyed into the tower by a lifting pump, and then the water and air exchange heat or heat and mass exchange so as to achieve the purpose of reducing the water temperature.
Water management level of a water system of a developed foreign country is high, water is generally recycled and treated as much as possible and non-traditional water resources are considered as a supplementary water source, so that the consumption of new water and the amount of discharged wastewater are reduced. Although the national environmental protection policy is becoming stricter and the enterprise is paying more attention to the management of water resources at present, the correlation between the concentration ratio and the water replenishing rate of the circulating system is not described quantitatively by using a mathematical model theory.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the method for determining the water replenishing rate of the circulating system through the concentration ratio when impurities are removed, so that the operating parameters of the circulating water system can be objectively and truly reflected, the problems in operation can be timely adjusted and checked, the water replenishing rate of the system can be accurately controlled, the new water consumption of the system can be reduced, and the effects of energy conservation and emission reduction can be realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
the method for determining the water replenishing rate of the circulating system through concentration ratio when impurities are removed is characterized in that: the circulating system is an open circulating water cooling system, comprises all pipeline valves, a cooling tower system and a production process heat exchange system and is in a stable operation state;
the only water replenishing rate entering the circulating water cooling system is F0The discharge water rate of the circulating water cooling system comprises F1And F2In which F is1Is the rate of discharge of the salt-carrying substances, F2The water discharge rate is the water discharge rate discharged only in the form of water molecules;
the concentration of each ion in the circulating water cooling system is C11，C12，C13····C1(n-1)，C1nAnd C is11＜C12＜C13····C1(n-1)＜C1nThe concentration of each ion in the corresponding water supplement is C01，C02，C03····C0(n-1)，C0nConcentration multiplying factor N ═ C of circulating water cooling system11+C12+C13+····+C1(n-1)+C1n)/(C01+C02+C03+····+C0(n-1)+C0n) N is 3-5;
the removal rate of the impurities is H, the proportion of salt substances removed through the net ring of the circulating water cooling system is shown, and the removal means comprises but is not limited to side filtration and total filtration;
ions in the circulating water cooling system include but are not limited to sodium ions, potassium ions, chloride ions, fluoride ions, calcium ions, magnesium ions, sulfate ions, nitrate ions, silicon ions, iron ions and aluminum ions, the concentration of the ions does not change within 24 hours under the condition of normal temperature and normal pressure illumination, and the ions are not contained in the agent brought into the surrounding environment and added into the system;
said F0Only supplementing water for manual work, neglecting the influence of natural conditions, including but not limited to rain, snow and hail;
said F1The salt substances with the same concentration as the circulating water cooling system are contained in the circulating water cooling system, the pollution discharge of the circulating water cooling system is limited, the leakage rate of the circulating water cooling system is zero, and the influence of phenomena such as drifting, splashing and leakage is ignored and not limited;
said F2The water is discharged into the environment in the form of water molecules, including but not limited to evaporation on the water surface and evaporation of water on the object surface, and is a constant under natural conditions;
according to water balance: f0＝F1+F2；
According to the balance of water quality salt substances: f0＝F1·N+H·N(1-F0)；
Finally obtaining F0＝N(F2-H)·[N(1-H)-1]-1。
Said F2The value is 0.01-0.02.
The invention has the beneficial effects that: the concentration ratio numerical value of the circulating system can be objectively and truly obtained, so that the water replenishing rate of the system is accurately controlled, the new water consumption of the system is reduced, and the effects of energy conservation and emission reduction are realized.
Detailed Description
The following description is given with reference to specific examples:
example 1:
an open circulating water cooling system with long-term stable operation has a water supplementing rate of 0.0077 measured in practice, F2The constant of (2) is 0.01, the concentration of potassium ions in a circulating system is 10.2mg/L, the concentration of magnesium ions is 22.1mg/L, and the concentration of chloride ions is 45.2 mg/L; the concentration of potassium ions in the water is 3.5mg/L, the concentration of magnesium ions is 7.4mg/L, the concentration of chloride ions is 15.1mg/L, and the impurity removal rate H is 0.006.
So that N ═ 10.2+22.1+45.2)/(3.5+7.4+15.1) ═ 2.98,
water supply rate of system F0＝2.98×(0.01-0.006)/(2.98×0.994-1)＝0.0061。
The real water supplement rate of the system obtained through model calculation is smaller than the water supplement rate obtained through actual measurement, so that the problem that the water supplement rate of the system is high is judged. By checking the problems existing in the operation of the system, the actual water replenishing rate is reduced, and the reduction of the new water consumption is realized.
Example 2:
an open circulating water cooling system with long-term stable operation, the water supplementing rate measured by practice is 0.015, F2The constant of (2) is 0.015, the concentration of silicon ions in a circulating system is 1.5mg/L, the concentration of potassium ions is 15.6mg/L, and the concentration of magnesium ions is 23.8 mg/L; the concentration of silicon ions in the water is 0.44mg/L, the concentration of potassium ions is 3.9mg/L, the concentration of magnesium ions is 5.9mg/L, and the impurity removal rate H is 0.008.
So that N ═ 1.5+15.6+23.8)/(0.44+3.9+5.9) ═ 3.99,
water supply rate of system F0＝3.99×(0.015-0.008)/(3.99×0.992-1)＝0.0094。
The real water supplement rate of the system obtained through model calculation is smaller than the water supplement rate obtained through actual measurement, so that the problem that the water supplement rate of the system is high is judged. By checking the problems existing in the operation of the system, the actual water replenishing rate is reduced, and the reduction of the new water consumption is realized.
Example 3:
an open circulating water cooling system with long-term stable operation has a water supplementing rate of 0.026 and F measured actually2The constant of (2) is 0.02, the concentration of silicon ions in the circulation system is 2.5mg/L, the concentration of potassium ions is 15.5mg/L, and the concentration of calcium ions in the circulation system is 15.5mg/LSeed is 50.6 mg/L; the concentration of silicon ions in the water is 1.52mg/L, the concentration of potassium ions is 3.2mg/L, the concentration of calcium ions is 10.3mg/L, and the impurity removal rate H is 0.01.
So that N ═ 4.57 (2.5+15.5+50.6)/(1.52+3.2+10.3),
water supply rate of system F0＝4.57×(0.02-0.01)/(4.57×0.99-1)＝0.0130。
The real water supplement rate of the system obtained through model calculation is smaller than the water supplement rate obtained through actual measurement, so that the problem that the water supplement rate of the system is high is judged. By checking the problems existing in the operation of the system, the actual water replenishing rate is reduced, and the reduction of the new water consumption is realized.
Claims (2)
1. A method for determining the water replenishing rate of a circulating system through concentration ratio when impurities are removed is characterized in that: the circulating system is an open circulating water cooling system, comprises all pipeline valves, a cooling tower system and a production process heat exchange system and is in a stable operation state;
the only water replenishing rate entering the circulating water cooling system is F0The discharge water rate of the circulating water cooling system comprises F1And F2In which F is1Is the rate of discharge of the salt-carrying substances, F2The water discharge rate is the water discharge rate discharged only in the form of water molecules;
the concentration of each ion in the circulating water cooling system is C11，C12，C13····C1(n-1)，C1nAnd C is11＜C12＜C13····C1(n-1)＜C1nThe concentration of each ion in the corresponding water supplement is C01，C02，C03····C0(n-1)，C0nConcentration multiplying factor N ═ C of circulating water cooling system11+C12+C13+····+C1(n-1)+C1n)/(C01+C02+C03+····+C0(n-1)+C0n) N is 3-5;
the removal rate of the impurities is H, the proportion of salt substances removed through the net ring of the circulating water cooling system is shown, and the removal means comprises but is not limited to side filtration and total filtration;
ions in the circulating water cooling system include but are not limited to sodium ions, potassium ions, chloride ions, fluoride ions, calcium ions, magnesium ions, sulfate ions, nitrate ions, silicon ions, iron ions and aluminum ions, the concentration of the ions does not change within 24 hours under the condition of normal temperature and normal pressure illumination, and the ions are not contained in the agent brought into the surrounding environment and added into the system;
said F0Only supplementing water for manual work, neglecting the influence of natural conditions, including but not limited to rain, snow and hail;
said F1The salt substances with the same concentration as the circulating water cooling system are contained in the circulating water cooling system, the pollution discharge of the circulating water cooling system is limited, the leakage rate of the circulating water cooling system is zero, and the influence of phenomena such as drifting, splashing and leakage is ignored and not limited;
said F2The water is discharged into the environment in the form of water molecules, including but not limited to evaporation on the water surface and evaporation of water on the object surface, and is a constant under natural conditions;
according to water balance: f0＝F1+F2；
According to the balance of water quality salt substances: f0＝F1·N+H·N(1-F0)；
Finally obtaining F0＝N(F2-H)·[N(1-H)-1]-1。
2. The method for determining the water replenishing rate of a circulating system through the concentration rate when removing impurities according to claim 1, wherein the method comprises the following steps: said F2The value is 0.01-0.02.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0972693A (en) * | 1995-06-26 | 1997-03-18 | Mitsubishi Plastics Ind Ltd | Managing method for cooling tower |
| US20030127391A1 (en) * | 2001-07-26 | 2003-07-10 | Craft Frank S. | Method for treatment of circulating cooling water |
| JP2003269888A (en) * | 2002-03-13 | 2003-09-25 | Kurita Water Ind Ltd | Concentration controlling method for cooling water system |
| CN103307928A (en) * | 2013-06-24 | 2013-09-18 | 神华集团有限责任公司 | Control method of open circulating water cooling system |
| CN106091797A (en) * | 2016-06-21 | 2016-11-09 | 中国神华能源股份有限公司 | Large Copacity circulating cooling water tower mends water discharge method and system |
| CN109931801A (en) * | 2019-03-26 | 2019-06-25 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | A kind of power plant circulating cooling water tower basin automatic water replenishing system and method for supplementing water |
| CN110195619A (en) * | 2019-05-30 | 2019-09-03 | 中国水利水电科学研究院 | Fired power generating unit regulating system, method and device |
-
2020
- 2020-05-29 CN CN202010474608.3A patent/CN111666670B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0972693A (en) * | 1995-06-26 | 1997-03-18 | Mitsubishi Plastics Ind Ltd | Managing method for cooling tower |
| US20030127391A1 (en) * | 2001-07-26 | 2003-07-10 | Craft Frank S. | Method for treatment of circulating cooling water |
| JP2003269888A (en) * | 2002-03-13 | 2003-09-25 | Kurita Water Ind Ltd | Concentration controlling method for cooling water system |
| CN103307928A (en) * | 2013-06-24 | 2013-09-18 | 神华集团有限责任公司 | Control method of open circulating water cooling system |
| CN106091797A (en) * | 2016-06-21 | 2016-11-09 | 中国神华能源股份有限公司 | Large Copacity circulating cooling water tower mends water discharge method and system |
| CN109931801A (en) * | 2019-03-26 | 2019-06-25 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | A kind of power plant circulating cooling water tower basin automatic water replenishing system and method for supplementing water |
| CN110195619A (en) * | 2019-05-30 | 2019-09-03 | 中国水利水电科学研究院 | Fired power generating unit regulating system, method and device |
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