CN111649521B - Method for determining water replenishing rate of circulating water cooling system through temperature concentration rate - Google Patents
Method for determining water replenishing rate of circulating water cooling system through temperature concentration rate Download PDFInfo
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- CN111649521B CN111649521B CN202010474578.6A CN202010474578A CN111649521B CN 111649521 B CN111649521 B CN 111649521B CN 202010474578 A CN202010474578 A CN 202010474578A CN 111649521 B CN111649521 B CN 111649521B
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- water
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- temperature
- circulating water
- cooling system
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Classifications
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- 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
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
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- 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
-
- 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
- F25D2500/00—Problems to be solved
- F25D2500/04—Calculation of parameters
Abstract
The invention discloses a method for determining the water replenishing rate of a circulating water cooling system through temperature concentration multiplying power, which can objectively and truly reflect the operation 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 water cooling system through temperature concentration rate.
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 pays more attention to the management of water resources at present, the correlation between the water replenishing rate and the temperature concentration rate of the circulating system is not quantitatively described by 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 water cooling system through the temperature concentration rate, which can objectively and truly reflect the operation parameters of the circulating water system and timely adjust and investigate the 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.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for determining the water replenishing rate of a circulating water cooling system through temperature concentration rate is characterized by comprising the following steps: the circulating water cooling 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 temperature of the water supplement is T0The 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 temperature of the inlet water before entering the cooling tower system is T1The outlet water temperature of the cooling tower system is T2(ii) a Cooling capacity coefficient K ═ T of cooling tower system1/T2K is a constant according to the characteristics of the cooling tower, when K is 1, the cooling tower can completely eliminate the equipment heat load, and when K is less than 1, the phenomenon that the cooling tower has insufficient cooling capacity is shown;
temperature concentration multiplying power N ═ T of circulating water cooling system2/T0The ratio of the temperature of circulating water to the temperature of water supplement;
said F0Only supplementing water for manual work, neglecting the influence of natural conditions, including but not limited to rain, snow and hail;
said F1Salt substances with the same concentration as the circulating water cooling system, including but not limited to pollution discharge, drifting, splashing, running, overflowing and leaking;
said F2Discharge to the environment in the form of water molecules, including but not limited to evaporation from the surface of water, evaporation of water from the surface of an object, inA constant under natural conditions;
according to water balance: f0＝F1+F2；
According to the energy balance: f0T0+(T2-T1)＝(F1+F2)T2；
Thus, F0＝N·(1-K)/(N-1)。
The value of K is 0.9-1.
Said F2The value is 0.01-0.02.
The invention has the beneficial effects that: the temperature concentration multiplying power value of the circulating system can be objectively and truly obtained, so that the leakage 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-type circulating water cooling system with long-term stable operation has water supplementing rate of 0.11, K constant of 0.98, and cooling tower system outlet water temperature T2At 24 ℃ and a water replenishing temperature T1Is 16 degrees celsius.
So N24/16 1.5,
water supply rate of system F0＝1.5×(1-0.98)/(1.5-1)＝0.06。
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 has water supplementing rate of 0.15, K constant of 0.96, and cooling tower system outlet water temperature T2At 28 ℃ and a water replenishing temperature T1Is 16 degrees celsius.
So N28/16 1.75,
water supply rate of system F0＝1.75×(1-0.96)/(1.75-1)＝0.09。
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 water supplementing rate of 0.19, K constant of 0.94, and water outlet temperature T of cooling tower system in circulating system2At 32 ℃ and a water replenishing temperature T1Is 16 degrees celsius.
So N32/16 2,
water supply rate of system F0＝2×(1-0.94)/(2-1)＝0.12。
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 (3)
1. A method for determining the water replenishing rate of a circulating water cooling system through temperature concentration rate is characterized by comprising the following steps: the circulating water cooling 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 temperature of the water supplement is T0The 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 temperature of the inlet water before entering the cooling tower system is T1The outlet water temperature of the cooling tower system is T2(ii) a Cooling capacity coefficient K ═ T of cooling tower system1/T2K is based on the properties of the cooling towerA constant, when K is 1, the cooling tower can completely eliminate the heat load of the equipment, and when K is less than 1, the phenomenon that the cooling tower has insufficient cooling capacity is shown;
temperature concentration multiplying power N ═ T of circulating water cooling system2/T0The ratio of the temperature of circulating water to the temperature of water supplement;
said F0Only supplementing water for manual work, neglecting the influence of natural conditions, including but not limited to rain, snow and hail;
said F1Salt substances with the same concentration as the circulating water cooling system, including but not limited to pollution discharge, drifting, splashing, running, overflowing and leaking;
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 energy balance: f0T0+(T2-T1)＝(F1+F2)T2；
Thus, F0＝N·(1-K)/(N-1)。
2. The method for determining the water replenishing rate of the circulating water cooling system through the temperature concentration rate as claimed in claim 1, wherein: the value of K is 0.9-1.
3. The method for determining the water replenishing rate of the circulating water cooling system through the temperature concentration rate as claimed in claim 1, wherein: said F2The value is 0.01-0.02.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010474578.6A CN111649521B (en) | 2020-05-29 | 2020-05-29 | Method for determining water replenishing rate of circulating water cooling system through temperature concentration rate |
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| CN202010474578.6A CN111649521B (en) | 2020-05-29 | 2020-05-29 | Method for determining water replenishing rate of circulating water cooling system through temperature concentration rate |
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| CN111649521A CN111649521A (en) | 2020-09-11 |
| CN111649521B true CN111649521B (en) | 2022-03-22 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694357A (en) * | 2009-10-20 | 2010-04-14 | 南京工业大学 | Double-circulation industrial circulating cooling water device capable of being operated with high cyele of concentration |
| CN104991579A (en) * | 2015-07-03 | 2015-10-21 | 西安西热水务环保有限公司 | System and method for controlling concentration ratio of open type circulating cooling water system |
| CN109521813A (en) * | 2018-11-13 | 2019-03-26 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | A kind of system and method for thermal power plant recirculated water concentration rate stability contorting |
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- 2020-05-29 CN CN202010474578.6A patent/CN111649521B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694357A (en) * | 2009-10-20 | 2010-04-14 | 南京工业大学 | Double-circulation industrial circulating cooling water device capable of being operated with high cyele of concentration |
| CN104991579A (en) * | 2015-07-03 | 2015-10-21 | 西安西热水务环保有限公司 | System and method for controlling concentration ratio of open type circulating cooling water system |
| CN109521813A (en) * | 2018-11-13 | 2019-03-26 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | A kind of system and method for thermal power plant recirculated water concentration rate stability contorting |
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| CN111649521A (en) | 2020-09-11 |
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