Optimized energy-saving cold-preventing system and method at air inlet sides of cooling tower

Abstract

The invention discloses an optimized energy-saving cold-preventing system and method at air inlet sides of a cooling tower. The optimized energy-saving cold-preventing system comprises a plurality of electric air-curtain adjusting components, an acquisition unit and a control unit, wherein the plurality of electric air-curtain adjusting components are matched and arranged at the air inlet sides of all areas of the cooling tower and are used for adjusting the air inlet amount of the cooling tower and further controlling the temperature of circulating water; the acquisition unit is used for acquiring site information of the cooling tower in real time; the control unit is used for controlling the action of the electric air-curtain adjusting components to adjust and control the temperature ofthe circulating water on the basis of the site information of the cooling tower acquired by the acquisition unit; the acquisition unit is in signal connection with the control unit; and the pluralityof electric air-curtain adjusting components are respectively in communication connection with the control unit. According to the optimized energy-saving cold-preventing system and method disclosed by the invention, the defects of poor temperature adaptability, poor cold-preventing effect, poor energy saving effect, low automation degree, high cost, large labor amount and poor safety and the likein the prior art can be overcome so as to realize the advantages of good temperature adaptability, good cold-preventing effect, good energy saving effect, high automation degree, low cost, low labor amount and good safety.

Description

technical field [0001] The invention relates to cooling tower cold protection technology, in particular to an energy-saving and cold protection system and method for optimizing the air inlet side of a cooling tower. Background technique [0002] As we all know, the northern part of my country has a temperate seasonal continental climate, with a large temperature difference between day and night in winter, and the lowest temperature can reach -30°C~-40°C. The cooling towers located in thermal power plants in northern my country are extremely vulnerable to freezing hazards. It is very important to ensure the efficient, safe and economical operation of cooling towers. [0003] Cooling towers located in northern regions are vulnerable to freezing hazards during winter operation. After the cooling tower freezes, it affects the ventilation in the cooling tower, reduces the efficiency of the cooling tower, and gradually increases the temperature of the circulating water, thereby r...

AI Technical Summary

Problems solved by technology

[0015] ⑴ Poor temperature adaptability: hot water bypass pipes (antifreeze pipes), anti-icing rings, and water spray filler partitions need comprehensive control to play a role. These methods are difficult to adjust at any time according to ambient temperature, wind direction, and water temperature, and can only be carried out seasonally. Manual adjustment is very inflexible, time-consuming and labor-intensive, and the temperature adaptability is poor;

[0016] Manual suspension of the windshield is labor-intensive and inflexible in operation. Due to the variable temperature and large temperature difference in winter, it is difficult to manually adjust the windshield frequently, and the temperature adaptability is also poor;

[0017] The uniformity of the ice film of the rapid spray icing anti-cold method is greatly affected by objective conditions, and the melting speed is uncontrollable and uneven. The freeze-thaw uniformity of the ice film cannot be solved

When the temperature of the ambient circulating water rises, the ice film melts slowly and the cooling effect is not good. This problem cannot be solved and the adaptability is poor;

[0018] The shutter device has a certain wind blocking phenomenon at the air inlet, which will affect the natural air intake in summer and reduce the cooling effect of the cooling tower in summer;

[0019] ⑵ Poor cold protection effect: hot water bypass pipe (anti-freeze pipe), anti-icing ring, and water spray filler partition operation need comprehensive control to play a role, and manual operation is difficult to coordinate properly. When the amount of water distributed on the water spray filler is too small , it will still cause the area to freeze, and the effect of cold and frost protection is poor;

[0020] Manually hanging the windshield cannot be adjusted manually in time, and the depth of antifreeze in especially cold weather is limited, which cannot meet the requirements of deep antifreeze, and the antifreeze effect is poor;

[0021] The uniformity of the ice film of the rapid spray icing anti-cold method is greatly affected by objective conditions, especially in cold weather, the antifreeze effect is affected by the uneven ice film;

[0022] (3) Poor energy saving: hot water bypass pipes (antifreeze pipes), anti-icing rings, and water spray fillers need comprehensive control to play a role in partition operation, and only have a single function of cold protection, and do not have energy-saving functions;

[0023] Due to the variable temperature and large temperature difference in winter, windshields are hung artificially to ensure the temperature of circulating water when the temperature is extremely low. When the weather warms up and the sun shines during the day, natural ventilation is insufficient and the temperature of circulating water will be too high. Affect the vacuum of the steam turbine and increase the coal consumption of the generating set;

[0024] The rapid spray icing method also has the uncontrollable melting speed of the ice film. When the weather warms up and the temperature of the circulating water rises during the day, the ice film melts slowly and the cooling effect of the cooling tower is not good;

[0025] The louvers are similar to the hanging windshields. In order to ensure the temperature of the circulating water when the temperature is extremely low, the louvers will be closed as much as possible. When the weather warms up and the sun shines during the day and the temperature is high, the temperature of the circulating water will be too high to affect the vacuum of the steam turbine and increase the coal consumption of the generator set;

[0026] ⑷Low degree of automation: hot water bypass pipe (antifreeze pipe), anti-icing ring, and water spray filler partition operation need comprehensive control to play a role, and can only be adjusted manually according to weather and other conditions;

[0028] The rapid spray freezing and cold protection method can only realize automatic spraying and cannot control the melting of ice film;

[0029] There are so many shutter blades that it is difficult to realize electric and automatic adjustment;

[0030] (5) High cost: manual suspension of windshields is difficult to operate. Due to the variable temperature and large temperature difference in winter, it is difficult to manually adjust the suspension of windshields frequently. Considering that when the temperature is low at night, more windshields are hung to ensure the temperature of circulating water. When the temperature is high during the day, the circulating water temperature will be too high to affect the vacuum of the steam turbine and increase the coal consumption of the generator set;

[0031] Improper anti-cold measures make the icing of the water spraying device bear a large overload, and even the water spraying filler and the supporting beam collapse, and the ventilator is severely damaged by freezing and thawing, resulting in insufficient natural draft of the ventilator and reducing the cooling tower. The service life increases the maintenance cost and increases the power generation cost of the enterprise;

[0032] ⑹Large amount of manual labor: manual suspension of the windshield is labor-intensive, and it is difficult to manually adjust the windshield frequently due to the variable temperature and large temperature difference in winter;

[0033] The rapid spray freezing and cold protection method, the ice film outside the fence falls off irregularly, accumulates too much, is not easy to handle, and the ice cubes after manual handling are heavy workload;

[0034] The shutters adjust the air intake, and the number of blades is extremely large, so it is difficult to realize electric adjustment, and the manual adjustment workload is heavy and the lag is large

There is no ability to automatically adapt to changes in ambient temperature, wind direction, speed, circulating water inlet and outlet temperature, etc., and cannot respond quickly and accurately to regulation;

[0035] ⑺ Poor safety: manual suspension of the windshield requires climbing operations, and the wind speed at the air inlet of the cooling tower is extremely high, which is prone to falling from high altitudes and other dangers;

[0036] In the rapid spray freezing method, the uniformity of the ice film is greatly affected by objective conditions, and the melting speed is uncontrollable and uneven. The ice film outside the fence falls off irregularly, accumulates too much, and is difficult to handle. certain danger

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