CN103697554B - A kind of closed type heat source tower water receiving divides the water liquid collecting circulatory system - Google Patents

Abstract

A closed heat source tower receiving water and collecting liquid circulation system, which includes a water receiving system, a water separating system, and a liquid collecting and circulating system. The invention has the advantages of compact structure, convenient installation, high discharge rate of condensed water, convenient recovery of spray liquid (that is, circulating liquid), complete isolation of condensed water and spray liquid, simple switching between condensed water discharge working conditions and spray liquid circulating working conditions, and It can be widely used in various closed heat source towers for rainwater discharge when the heat source tower is shut down, condensate water discharge under the wet operation condition and defrosting condition of the heat source tower, summer spray water circulation and winter frost protection liquid circulation.

Description

A Closed Heat Source Tower Receives Moisture Collection Liquid Circulation System

technical field

The invention relates to a closed-type heat source tower receiving water and water collection circulation system, which can simultaneously receive various liquids falling from the top of the heat source tower, including rainwater falling into the tower body through the air outlet of the heat source tower when it rains, and spraying in summer. Spray water for cooling down, condensed water falling from the surface of the heat exchanger under wet conditions in winter, antifreeze sprayed under frost-proof conditions in winter, and automatically discharge rainwater and condensed water, and spray water It is automatically collected with circulating fluid such as antifreeze for recycling.

Background technique

At present, the closed heat source tower heat pump air conditioning system has been widely used as a new type of air conditioning system. It uses the closed heat source tower to provide heat pump cold source for evaporative cooling in summer and convective heat exchange in winter to provide heat pump heat source. It is conducive to saving land, saving initial investment, reducing energy consumption, and reducing environmental pollution. Since the closed heat source tower must work in a natural environment, it is greatly affected by the external climate environment. At the same time, the closed heat source tower has to undertake two different functions of heat dissipation in summer and heat extraction in winter. During the working process, there will be spraying conditions in summer, dry conditions in winter, wet conditions, frost protection conditions, and frosting conditions. conditions, defrosting conditions and other multi-working conditions.

When the closed heat source tower works in summer, the cooling water flows in the heat exchanger coil, and the fan sucks the external air from the air guide port to exchange heat through the heat exchanger; the spray water is sprayed on the heat exchanger coil and the heat exchanger through the spray system. On the surface of the fins, the heat exchange is enhanced. After passing through the heat exchanger, the spray water falls into the water receiving tray at the lower part of the heat source tower and is sent to the spray system again by the spray pump for circular spraying. The cooling water in the heat exchanger coil transfers heat to the air and spray water, and the temperature is lowered, so that it is provided to the heat pump host as a cooling source.

In winter work, the circulating solution with a lower freezing point flows in the heat exchanger coil, and the fan sucks the external air from the air guide port to exchange heat with the heat exchanger. Provide heat source. If the temperature of the internal circulation solution is high at this time, and the surface temperature of the heat exchanger coil and fins is lower than the ambient dry bulb temperature but higher than the ambient wet bulb temperature, then the surface of the heat exchanger will not condense, and the heat source tower will work under dry conditions. If the temperature of the internal circulation solution is low at this time, and the surface temperature of the heat exchanger is lower than the dew point temperature but higher than 0°C, condensation will appear on the surface of the heat exchanger at this time. This operating condition is called a wet condition. , Under wet conditions, the condensed water on the surface of the heat exchanger will fall along the fins into the water pan, which needs to be discharged continuously. If the temperature of the internal circulation solution is low at this time and the surface temperature of the heat exchanger is lower than 0°C, frost will appear on the surface of the heat exchanger. To prevent it from frosting, it is necessary to spray a spray solution with a lower freezing point from the spray system The surface of the heat exchanger is used to reduce the freezing point of the surface of the heat exchanger. After the spray solution passes through the heat exchanger, it falls into the water receiving tray and is sent to the spray system again by the spray pump for circular spraying. This is the anti-frost working condition. If there is no spray anti-frost, but continuous operation under the condition of frost, the frost layer will gradually form and thicken, which is the frosting working condition. Due to the large thermal resistance of the frost layer, the working performance of the heat source tower is gradually reduced. It is necessary to defrost the surface of the heat exchanger (by heating the surface of the heat exchanger, etc.), and the frost layer on the surface of the heat exchanger will turn into condensation after melting. Water falls into the drip tray, which is the defrosting condition.

It can be seen from the above situation that the current heat source tower needs to be switched under different working conditions due to the different functions provided by the heat source tower during summer and winter operation. Especially in winter, when the heat source tower operates under different working conditions, the heat source tower will alternately produce spray liquid and condensed water. When the heat source tower changes from a dry working condition to a wet working condition, condensed water needs to be discharged to the external environment. When changing from a wet working condition to an anti-frost working condition, antifreeze needs to be added to the heat source tower for circulating spraying. Do not discharge into the environment. When defrosting is required at the end of the frosting condition, the condensed water melted under the defrosting condition also needs to be discharged to the environment. In this way, in the water receiving tray of the closed heat source tower, there will be sometimes condensed water, sometimes sprayed antifreeze, and sometimes condensed water after the frost melts. Condensed water needs to be discharged, and antifreeze needs to be recycled for circulation. However, the generation and discharge of condensed water and the recycling of antifreeze are affected by weather conditions. There is no specific reference at all, which brings certain challenges to the operation of the heat source tower. influences.

In the currently used closed heat source towers, the same water receiving tray is adopted, and a water storage tank is connected to the lower part. In summer working conditions, the spray water is stored in the water storage tank, and the spray circulation pump directly extracts the water in the water storage tank for spraying. Since the water receiving tray is connected to the atmosphere, when it rains, the rainwater directly falls into the water receiving tray through the outlet of the fan and then enters the water storage tank, which will pollute the water quality of the water storage tank and accelerate the scaling and corrosion of the heat exchanger surface. In winter, rain and snow can also enter the drip tray and cause the same effect. In winter operation, the method of "one discharge, one charge, re discharge, re charge" is often used to discharge condensate and use antifreeze. That is, when the outside temperature is not too low, the condensed water is discharged uniformly at one time. When frost protection treatment is required, the water storage tank is filled with antifreeze, and the circulating water pump is turned on for frost protection treatment. When frost protection treatment is not required, the antifreeze solution is taken out. Finally, discharge the condensed water (if the antifreeze is not taken out, the condensed water will enter the antifreeze and cause the freezing point of the antifreeze to rise), and refill the antifreeze when the antifreeze cycle is needed next time. At the same time, when the antifreeze is stored in the water storage tank, due to the communication with the atmosphere, water will evaporate, resulting in excessive viscosity, resulting in unstable operation of the water pump.

It can be seen from the above that in the use of the closed heat source tower, due to the presence of rainwater, condensed water, and spray liquid in the tower, there are several different types of fluids, which require selective discharge and collection cycles. At present, rainwater is not discharged but directly mixed in the water storage tank. The discharge of condensed water and the filling of antifreeze are based on the experience of workers. In some cases, the condensed water is not even discharged. As a result, the heat exchanger structure of the heat source tower is serious, the heat exchange efficiency is low, and the freezing point of the antifreeze fluid rises rapidly, which further affects the working efficiency of the heat source tower heat pump host.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of self-drainage and liquid collection of the existing closed heat source tower, realize rainwater discharge, discharge of condensed water under different working conditions, recovery and recycling of circulating fluid are mutually isolated, and do not interfere with each other. One-time filling and repeated use of the circulating fluid makes the heat source tower run smoothly and the closed heat source tower receives water and collects liquid circulation system with low operating costs.

The technical solution adopted by the present invention to solve its technical problems is:

A closed heat source tower receiving water and collecting liquid circulation system, which includes a water receiving system, a water dividing system, and a liquid collecting and circulating system;

The water receiving system includes a water receiving tray and a diversion pipe. The water receiving tray is arranged below the heat exchanger of the closed heat source tower. The ports are connected, and a through hole is opened in the center of the guide tube;

The water distribution system includes a liquid-water separator, a drain pipe and an electric two-way valve. The liquid-water separator is installed under the water receiving tray, and the guide pipe is placed in the liquid-water separator. There are holes around the upper part of the liquid-water separator. The position of the lower end of the diversion pipe is lower than the position of the orifice around the upper part of the liquid-water separator. The lower part of the separator is connected to one end of the drain pipe, and the other end of the drain pipe extends to the outside of the closed heat source tower, and the electric two-way valve is installed on the drain pipe;

The liquid collection circulation system includes a liquid collection tank, a spray circulation pump, and a circulation pipe. The liquid collection tank is installed under the water receiving tray, and the liquid water separator is placed in the liquid collection tank. The liquid collecting tank is connected with the liquid collecting tank through the opening at the lower part of the liquid collecting tank, and the spray circulating pump is installed on the circulating pipe.

Further, the surface area of the water receiving tray is the same as the net area of the tower body, and the net area of the tower body refers to the horizontal cross-sectional area of the inner space of the tower body, so as to be able to collect the liquid falling from the heat source tower.

Further, the water receiving system further includes a filter, and the filter is installed above the central through hole of the draft pipe.

Further, the liquid collection tank is externally connected with a water supply pipe.

The closed heat source tower includes a tower body, an air duct is arranged on the top of the tower body, a fan is installed in the air duct, a nozzle is arranged above the heat exchanger, and a deflector is arranged below the heat exchanger.

The electric two-way valve on the drain pipe is normally open. The rainwater falling into the tower, the condensed water generated under wet conditions, and the condensed water generated during the defrosting process all pass through the water tray, filter, and diversion water. The pipe enters the liquid-water separator. At this time, since the electric two-way valve is opened, the rainwater and condensed water are directly discharged. When the spray circulation pump is turned on, the electric two-way valve is controlled by the working state of the spray circulation pump, and the electric two-way valve is closed. The circulating fluid enters the liquid-water separator through the water tray, filter, and guide pipe. Since the electric two-way valve on the drain pipe is closed, a part of the circulating fluid gathers in the liquid-water separator and passes through the upper part of the liquid-water separator. The orifice flows into the sump tank. The liquid collecting tank can contain the circulating liquid flowing out from the orifice around the upper part of the liquid-water separator, and the spray circulation pump can send the circulating liquid contained in the liquid collecting tank to the nozzle.

The present invention automatically separates rain and snow water, condensed water and circulating fluid by adopting a draft tube and a liquid-water separator. Compared with the existing closed heat source tower water collection and storage tank, the present invention can prevent rainwater from entering the circulating fluid, The discharge of condensed water is completely isolated from the collection of circulating fluid. The discharge of condensed water has no effect on the collection of circulating fluid. The collection of circulating fluid is not affected by the discharge of condensed water. Other operations are performed when switching between working conditions, which is conducive to ensuring a stable working state of the heat source tower, reducing operating costs and reducing operating errors.

The invention has the advantages of compact structure, convenient installation, high discharge rate of condensed water, convenient recovery of spray liquid (that is, circulating liquid), complete isolation of condensed water and spray liquid, simple switching between condensed water discharge working conditions and spray liquid circulating working conditions, and It can be widely used in various closed heat source towers for rainwater discharge when the heat source tower is shut down, condensate water discharge under the wet operation condition and defrosting condition of the heat source tower, summer spray water cycle and winter frost protection liquid cycle.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the closed heat source tower of the present invention receiving water and collecting liquid circulation system;

Fig. 2 is a schematic structural view of the draft tube of the present invention;

Fig. 3 is a schematic structural view of the liquid-water separator of the present invention.

detailed description

The present invention will be further described below in conjunction with drawings and embodiments.

With reference to the accompanying drawings, the closed heat source tower liquid collection circulation water diversion and drainage system of this embodiment includes a water receiving system, a water distribution system, and a liquid collection circulation system;

The water receiving system includes a water receiving tray 1, a filter 2 and a guide pipe 3, the water receiving tray 1 is arranged under the heat exchanger 13 of the closed heat source tower, and the surface area of the water receiving tray 1 is the same as the net area in the tower body , the net area in the tower body refers to the horizontal cross-sectional area of the inner space of the tower body. There is an orifice in the lower part of the water receiving tray 1, and the upper part of the diversion pipe 3 is connected with the orifice in the lower part of the water receiving tray 1. The diversion pipe 3 can The liquid in the water receiving tray 1 is diverted to the liquid-water separator 4 , the center of the guide pipe 3 has a through hole 15 , and the filter 2 is installed above the central through hole 15 of the guide pipe 3 .

The water distribution system includes a liquid-water separator 4, a drain pipe 6, and an electric two-way valve 7. The liquid-water separator 4 is installed under the water receiving tray 1, and the guide pipe 3 is placed in the liquid-water separator 4, and the liquid water There is an orifice 16 around the upper part of the separator 4, and the position of the lower end of the guide pipe 3 is lower than the position of the orifice 16 around the upper part of the liquid-water separator 4, and the inner cavity of the liquid-water separator 4 passes through the upper part of the liquid-water separator 4. The orifice 16 communicates with the inner cavity of the liquid collection tank 5, the lower part of the liquid-water separator 4 is connected to one end of the drain pipe 6, and the other end of the drain pipe 6 extends to the outside of the closed heat source tower, and the drain pipe 6 is equipped with an electric two-way valve 7;

The liquid collection circulation system includes a liquid collection tank 5, a spray circulation pump 8, and a circulation pipe 9. The liquid collection tank 5 is installed under the water receiving tray 1, and the liquid-water separator 4 is placed in the liquid collection tank 5. The bottom of the box 5 has a hole, and the circulation pipe 9 is connected to the liquid collection tank 5 through the opening at the bottom of the liquid collection box 5 , and the spray circulation pump 8 is installed on the circulation pipe 9 .

The liquid collecting tank 5 is externally connected with a water supply pipe 17 .

The closed heat source tower includes a tower body, an air cylinder 10 is arranged on the top of the tower body, and a fan 11 is installed in the air cylinder 10 , a nozzle 12 is arranged above the heat exchanger 13 , and a deflector 14 is arranged below the heat exchanger 13 .

When the closed heat source tower does not work or stops running, the electric two-way valve 7 is opened during the rainy or snowy stage, and the rainwater falls into the tower body through the air cylinder 10, and then passes through the water receiving tray 1, the filter 2, and the diversion The pipe 3 enters the liquid-water separator 4, and since the two-way valve 7 is opened at this time, the rainwater is directly discharged out of the tower body through the drain pipe 6.

When the closed heat source tower is in operation, the blower fan 11 starts to suck the external air from the deflector 14 , pass through the heat exchanger 13 , and then send out the tower body through the air duct 10 .

When the closed heat source tower is running in summer, a certain amount of spray water is first charged to the liquid collecting tank 5 through the water supply pipe 17, and the liquid level is lower than the position of the orifice 16 around the upper part of the liquid-water separator 4, and then the The spray circulation pump 8 is turned on, the electric two-way valve 7 is closed, and the circulating liquid (that is, the spray water in the liquid collection tank) is sprayed from the nozzle 12, sprinkled on the heat exchanger 13, and then passes through the water receiving tray 1- -Filter 2--The guide pipe 3 enters the liquid-water separator 4, and since the electric two-way valve 7 is closed, the circulating fluid gathers a part in the liquid-water separator 4 and passes through the orifices around the upper part of the liquid-water separator 4 16 flows into the liquid collection tank 5. Since the liquid collecting tank 5 is installed below the water receiving tray 1 and outside the liquid-water separator 4, the liquid collecting tank 5 can accommodate the circulating liquid flowing out from the orifice 16 around the upper part of the liquid-water separator 4. The lower opening of the liquid collection tank 5 is connected to the circulation pipe 9, and the circulation pipe 9 is equipped with a circulation pump 8, and the circulating liquid contained in the liquid collection tank 5 is sent to the nozzle 12 by the spray circulation pump 8 for circulating spraying. If the closed heat source tower stops running, the electric two-way valve 7 is closed, because the lower end nozzle position of the draft pipe 3 is lower than the orifice 16 position around the liquid-water separator 4 top, so in the liquid-water separator 4 The liquid level of the contained circulating fluid is higher than the lower end nozzle of the draft tube 3, and the circulating fluid in the liquid collection tank 5 cannot communicate with the atmosphere through the liquid-water separator 4 and the draft tube 3, so that the liquid-water separator 4 and the The combination of the draft tube 3 plays the role of a water seal, and the circulating fluid is isolated from the external atmosphere.

When the closed heat source tower is running in winter, a certain amount of antifreeze liquid is first filled into the liquid collection tank 5 through the external water supply pipe 17, and the liquid level is lower than the position of the orifice 16 around the upper part of the liquid-water separator 4:

When the surface temperature of the heat exchanger 13 of the heat source tower is higher than the dew point temperature of the external environment, there is no condensed water on the surface of the heat exchanger 13, and the heat source tower works in a dry condition without spraying and drainage;

If the external temperature drops, when the surface temperature of the heat exchanger 13 is lower than the dew point temperature of the external environment, the external air contacts the surface of the heat exchanger, and the water vapor in the air will condense into condensed water, and the surface of the heat exchanger 13 will continue to generate condensed water , the heat source tower is working under wet conditions, at this time, the spray circulation pump 8 is not working, the electric two-way valve 7 is opened, and the condensed water enters the liquid through the water receiving tray 1--filter 2--drain pipe 3 In the water separator 4, the condensed water is directly discharged through the drain pipe 6;

If the outside temperature continues to drop, when the surface temperature of the heat exchanger is lower than 0° C., after the water vapor in the outside air contacts the surface of the heat exchanger, frost will start to form on the surface of the heat exchanger 13 of the heat source tower. In order to make the heat source tower take heat from the air normally, there are two ways: one is to spray antifreeze for continuous work, and the surface of the heat exchanger will not frost; the other is not to spray antifreeze and let the surface of the heat exchanger Defrost after frosting.

When the surface temperature of the heat exchanger is lower than 0°C, in order to prevent frost on the surface of the heat exchanger 13, antifreeze can be sprayed on the surface of the heat exchanger 13 to prevent frost. At this time, the heat source tower works under the anti-frost condition. At this time, the spray circulation pump 8 is turned on, the electric two-way valve 7 is closed, and the antifreeze in the liquid collection tank 5, under the action of the spray circulation pump 8, reaches the nozzle 12 through the circulation pipe 9, and is sprayed out from the nozzle 12. , sprinkled on the heat exchanger 13, and finally enter the liquid-water separator 4 through the water tray 1--filter 2--drainage pipe 3. Since the electric two-way valve 7 on the drain pipe is in a closed state, the antifreeze After a part is collected in the liquid-water separator 4, it flows into the liquid-collecting tank 5 through the orifice 16 around the upper part of the liquid-water separator 4, and completes the whole cycle spraying.

When the surface temperature of the heat exchanger is lower than 0°C and the surface of the heat source tower heat exchanger 13 begins to frost, if the spray circulation pump 8 is not turned on to spray the antifreeze, the surface of the heat source tower heat exchanger 13 will gradually Frosting begins, and at this time, the heat source tower works under frosting conditions. Under this working condition, there is no need to turn on the spray circulation pump, and no condensed water is generated.

After the frosting condition is completed, the thickness of the frost layer on the surface of the heat exchanger increases. At this time, the frost layer on the surface of the heat exchanger needs to be removed, and the heat source tower enters the defrosting condition. In the defrosting condition, the frost layer on the surface of the heat exchanger 13 is melted into condensed water by heating the surface of the heat exchanger (by means of thermal fluid, electric heating, etc.). The circulation pump 8 is not started, and the electric two-way valve 7 is opened, and the condensed water falls directly from the surface of the heat exchanger 13 into the water receiving tray 1, and then passes through the filter 2, the guide pipe 3, the gas-liquid separator 4, the drain pipe 6, The electric two-way valve 7 discharges the tower body.

Claims (3)

1. A closed-type heat source tower is connected to water and water collection circulation system, it is characterized in that, comprises water receiving system, water distribution system, collection liquid circulation system; The water receiving system includes a water receiving tray and a diversion pipe. The water receiving tray is arranged below the heat exchanger of the closed heat source tower. The ports are connected, and a through hole is opened in the center of the guide tube; The water distribution system includes a liquid-water separator, a drain pipe and an electric two-way valve. The liquid-water separator is installed under the water receiving tray, and the guide pipe is placed in the liquid-water separator. There are holes around the upper part of the liquid-water separator. The position of the lower end of the diversion pipe is lower than the position of the orifice around the upper part of the liquid-water separator. The lower part of the separator is connected to one end of the drain pipe, and the other end of the drain pipe extends to the outside of the closed heat source tower, and the electric two-way valve is installed on the drain pipe; The liquid collection circulation system includes a liquid collection tank, a spray circulation pump, and a circulation pipe. The liquid collection tank is installed under the water receiving tray, and the liquid water separator is placed in the liquid collection tank. The liquid collecting tank is connected with the liquid collecting tank through the opening at the lower part of the liquid collecting tank, and the spray circulating pump is installed on the circulating pipe. 2. The closed heat source tower according to claim 1, characterized in that the surface area of the water receiving tray is the same as the net area in the tower body, and the net area in the tower body refers to the inner space of the tower body. horizontal cross-sectional area. 3. The closed-type heat source tower according to claim 1 or 2, wherein the water collection circulation system is characterized in that the water collection system also includes a filter, and the filter is installed in the central through hole of the draft pipe above.