CN1034972C - Spray Propulsion Draft Cooling Tower - Google Patents

Abstract

A new type of circulating water cooling tower is characterized by that more than one spray propelling atomizer is installed in the convergent-divergent tower body, if there are more than one spray propelling atomizer, the number of spray propelling atomizers is multiple, and the working water pressure of said atomizer is low. The flow is big, and atomization effect is good, can do atomizer and air exhauster simultaneously, makes it under the condition of not increasing power, forces the convection current heat dissipation to water smoke to cancel traditional filler and fan. The cooling tower has the advantages of large temperature reduction energy consumption, low manufacturing cost, simple structure, less maintenance amount, reliable operation and stable cooling effect, can replace the prior glass fiber reinforced plastic cooling tower, mechanical ventilation cooling tower and large-scale hyperbolic cooling tower, and can be widely applied to various departments of electric power, metallurgy, petroleum, chemical industry, machinery, light industry, salt making, sugar making, saltpeter making, textile, paper making, refrigeration, air conditioning, air separation and the like.

Description

A new circulating water cooling tower still uses air as the cooling medium to cool down the circulating water. However, it uses a spray propulsion device as an atomizer and an exhaust fan at the same time to perform forced heat dissipation and cooling on the water mist. It belongs to the spray propulsion internal ventilation cooling tower without an external power source. It is a low-cost, high-efficiency, production-increasing and energy-saving equipment that can be widely used in electric power, metallurgy, petroleum, chemical industry, machinery, light industry, salt, sugar, nitrate, textile, paper, refrigeration, air conditioning, air separation and other departments.

The current cooling towers at home and abroad include mechanical ventilation cooling towers, natural ventilation cooling towers and developing spray cooling towers. Mechanical ventilation cooling towers use plastic corrugated sheets as fillers, and external fans are installed for forced ventilation. The cost is low, but the fatal disadvantage is that the packing is easy to block, the fan is easy to be damaged, and the power consumption is large. The natural ventilation cooling tower relies on the tall tower body to draw air naturally to ensure the air volume required for cooling. It has stable cooling effect and small wind blowing water loss. Simple maintenance and convenient management. The disadvantage is that the tower body is very high (over 100 meters), large investment, complicated construction and maintenance, small water temperature difference, and it is not suitable for high temperature and high humidity areas. Such as: large-scale hyperbolic cooling towers, in view of the above defects, at present, domestic and foreign are committed to the development of jet cooling towers without fillers and fans. It uses the principle of spraying, uses a nozzle with good performance to spray, sucks air with mist flow, and mixes gas and liquid in the convergent-expanding air duct to enhance heat and mass transfer and cool the circulating water. Some drill a large number of inclined small holes on the rotating hot water pipe installed in the cooling tower to spray, and set the water turbine blade on the pipe to push the fan blade to draw air to achieve the purpose of cooling water (see Figure 4, Japanese Patent. 55-17316). But there are following problems in existing jet cooling tower: 1. Rely on the ejection effect of spray stream to draw air, can not reach the air-water ratio of the order of magnitude required for cooling in principle, cooling is limited, and its effect is not as good as existing ventilation cooling tower. 2. Lack of an atomizing device with excellent performance at low pressure, large flow and large channels, the contradiction between good spray effect and not easy to block is difficult to overcome. 3. The exhaust mechanism that has been seen so far relies on the blades of the water turbine to drive the fan to rotate because of its limited thrust and unreasonable structure, it is difficult to achieve an ideal air volume. In view of the above situation, the spray cooling tower has not been seen to occupy the market and be popularized and applied in production so far.

The purpose of the present invention is to provide a new type of cooling tower. On the basis of the remarkable effect of using multiple injection swirl atomization nozzles to remove fillers and spray cooling, the fan can be further removed without reducing the air volume and reducing energy consumption. Increase, more equipment, and can further improve the cooling effect of circulating water.

In the spray stacking ventilation cooling tower, there are water inlet main pipe, water inlet branch pipe or water inlet pipe, water outlet pipe, water collecting tray, air inlet, tower body, water eliminator, water retaining ring, and air outlet. More than one (including one) spray propulsion and atomization device 5 is set in the tower body, and the spray propulsion and atomization device has applied for a Chinese patent application number CN90.1.06170.0 and the application date is 901102. It can be arranged as multiple layers, and each layer of devices 5 is sprayed upwards, and the uppermost layer can be sprayed upwards or downwards. From the bottom to the top, the tower body can be a convergence-expansion air duct, and the shape of the air duct is conical, hyperbolic, cylindrical, or polygonal. The water inlet pipe and the water outlet pipe are arranged at the lower part of the tower body. If a plurality of spraying and propelling atomizing devices 5 are established, a water inlet main pipe and a water inlet branch pipe are established, and a spraying propelling atomizing device 5 is installed on each water inlet branch pipe. The drain pan is mounted on the bottom. The throat near the upper air outlet (the thinnest part of the tower body) is equipped with a water eliminator, the air inlet is set on the lower side of the tower body, and a water retaining ring is set on the inner wall of the tower body.

Embodiment, description of drawings

Fig. 1 embodiment of the present invention I (a spray propelling atomization device 5)

Figure 2 A type of jet cooling tower

Fig. 3 Embodiment II of the present invention (four spray propulsion atomization devices 5, the tower body profile is circular)

Fig. 4 Fig. 3A-A sectional view.

Fig. 5 Embodiment III of the present invention (four spray propulsion atomization devices 5, the tower body profile is a square)

Figure 6 Figure 5A-A sectional view.

See Fig. 1, the spray propulsion ventilation cooling tower provided by this embodiment I is suitable for replacing the small-flow FRP cooling tower, and a water collection tray 3 is set at the lower part of the convergent-expansion tower body 6, and the air inlet 8 is set on the lower side, and the throat 6. Water eliminators 7 are set at ₄ places, and water retaining rings 4 are set on the inner side of the air inlet 8. A water inlet pipe 1 is arranged at the center of the water collecting tray 3, and a water outlet pipe 2 is established at the side, and a spray propulsion atomization device 5 is installed on the top of the water inlet pipe 1, and the two are connected with a flange.

The hot water enters through the water inlet pipe 1, which makes the fan blades on the device 5 rotate. Because the atomization of the device 5 is good, the flow rate is large, and the area of the two-phase interaction of air and water is large, the thrust generated is also large. In this way, the fan may generate Turns quickly and produces a considerable amount of air volume. The wind passes through the fog flow area from bottom to top, and mixes with the water droplets in the area above the fan, so that the water droplets are in a state of forced heat dissipation. The airflow generated by the fan has three functions: ①Make the air-water two-phase in forced convection heat transfer, and strengthen the cooling effect of water. ②Promoting the further atomization of water mist outside the nozzle of device 5 leads to the increase of thrust and air volume, and the decrease of water droplets again, and the increase of thrust air volume again, forming a virtuous circle. ③The airflow forms a low-pressure area in the middle of the tower, so that the fine mist droplets are compressed in the middle without being dispersed, and the large water droplets fall outside the mist area, which can avoid drifting.

See Fig. 3, 4 embodiment II of the present invention, it is suitable for replacing large-scale fiberglass cooling tower and large-scale hyperbolic cooling tower, is different from Fig. 1: 1. tower body 6 ₂ adopts the convergent-expanding type wind that cross section is circular cylinder. ② A plurality of spraying propulsion atomization devices 5 are arranged and divided into two layers. Each device 5 is installed on each water pipe branch pipe 1. And establish a total water inlet pipe 1. Enter the tower body 6 ₂ from the lower side wall, and set the water collecting tray 3 and the water outlet pipe 2 at the bottom. Compared with the current mechanical ventilation cooling tower, the embodiment II is internally ventilated, and the mixing between air and water is more intense, and has a better cooling effect. , Compared with large hyperbolic cooling towers (natural draft cooling towers), the height of the cooling tower can be greatly reduced.

See Figures 4 and 5, Embodiment III of the present invention, which is suitable for technical transformation of ready-made concrete cooling towers with large quantities and wide facets. See Figures 3 and 4. The difference is that the section of the tower body 6 _{and 3} is square, which is characterized by difficulty in construction and low cost. , but the airflow field is not as uniform as shown in Figures 3 and 4

See Fig. 2, the jet cooling tower of the background technology. 14 hydraulic fan blades, 15 rotary hot water spray pipe, 16 bearing sealing structure, 17 hydraulic propulsion blades, 18 booster water pump.

Techno-economic effect of the present invention

1. According to the test results: when the dry bulb temperature of the atmosphere is 34°C, the wet bulb is 27°C, and the water inlet temperature is 42°C, the water temperature will drop to 10°C under the condition of having an external fan, and the water temperature will be reduced to 10°C without an external fan. Reduced to 7°C, if the cooling tower of the present invention is used (removing the filler, removing the fan, and installing the spraying and propelling atomization device 5), the water temperature drop will be greater than 10°C, and the increase in the circulating water temperature drop will bring great benefits for increasing production. From the perspective of salt production, when the temperature difference of circulating water changes by 1°C, the system output changes by about 0.2%, which is equivalent to a change of about 8 million yuan in the national vacuum salt production value.

2. Simple structure, convenient maintenance, high cooling and stability, especially in summer with stable and high yield. Due to the clogging of the filler, the temperature drop of the mechanical ventilation cooling tower gradually decreases as the service time increases. If the temperature is 10°C in the first year, it can be 3-4°C in the second year, thus forming a vicious circle. What is more serious is that the weight of the accumulated water in the tower will cause tilting and collapse, resulting in water shortage in summer and a significant decline in production.

3. The cancellation of external fans greatly saves power consumption. According to statistics, 86 years ago, there were more than 24,000 FRP cooling towers in China, with an installed capacity of 120,000 kw and an annual electricity consumption of 230 million kWh; there were more than 300 reinforced concrete cooling towers in Shanghai. With electricity consumption of 20 million kWh, only 6 concrete cooling towers in Zigong Salt Factory have an installed capacity of 900kw. In some small and medium-sized power stations, a large amount of electricity is also consumed in cooling water fans. It is not difficult to speculate that the cancellation of fans will greatly save power consumption.

4. Reduce the tower height to save investment (large hyperbolic cooling tower) to further improve the cooling effect.

5. It is conducive to the rational use of water resources. Due to the high temperature drop of the circulating water cooling tower, low energy consumption, low investment, and reduced maintenance, it will surely attract some users who use direct current water to switch to circulating water, which is beneficial to environmental protection.

6. Promote the development of high-tech cooling tower technologies and products to enter the international market.

Claims (4)

1. A spray propulsion ventilation cooling tower, which has a main water inlet pipe 1, a water inlet branch pipe or a water inlet pipe 1, a water outlet pipe 2, a water collection tray 3, an air vent 8, a tower body 6, a water eliminator 7, and a water retaining ring 4 . The air outlet 9 is characterized in that more than one (including one) spray propulsion atomization device 5 is arranged in the tower body 6 . 2. by the described cooling tower of claim 1, when it is characterized in that a plurality of spraying propelling atomization devices 5 are set, be arranged as multi-layer, when the spray propelling atomizing device 5 that each layer places, the spray propelling atomization that each layer places Device 5 is all upward spraying, and the uppermost layer adopts upward or downward spraying. 3. The cooling tower according to claim 1, characterized in that the tower body 6 can be a convergence-expansion air duct from bottom to top, and the air duct shape is conical 6 ₁ , hyperbolic, cylindrical 6 ₂ , polygonal 6 ₃ . 4. The cooling tower according to claim 1, characterized in that the water inlet, the main pipe 1 ₀ , the water inlet branch pipe or the water inlet pipe 1 and the water outlet pipe 2 are arranged at the lower part of the tower body 6; each water inlet branch pipe 1 is equipped with a spray propelling mist The water collector 5; the water collection tray 3 is installed at the bottom; the throat ₆₄ near the upper air outlet 8 is provided with a water eliminator 7;

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