Liuchu refrigeration-closed cooling system process flow

The process flow of the six-outlet refrigeration closed cooling system is divided into six parts: circulating water pump, production process heating equipment, pipeline system, closed cooling tower, stable pressure water supply system and ancillary systems. Energy saving and consumption reduction are the general trend. Compared with traditional open cooling towers, closed cooling systems have no pollution, no evaporation, and reduce water loss by about 40%. They also have the characteristics of rapid cooling and adjustable cooling temperature.

Closed cooling system process flow

1) Circulating water pump

Generally, it is a pipeline pump. Its function is to provide power for fluid circulation, supplement fluid to overcome system resistance, and ensure the source of power for circulating flow. It mainly has two parameters, one is the flow rate, which is provided according to the production process design, and the other is the lift, which is determined by the resistance of the entire system. It is mainly determined by the resistance loss of the production equipment, the resistance along the pipeline system, and the local resistance of each pipe fitting and ancillary equipment of the pipeline system. Resistance, the resistance loss of the closed cooling tower, the resistance loss of the water pump itself and the safety margin.

2. Production process heating equipment

As a producer of heat energy, all cooling systems are centered around its services. The amount of heat energy it generates determines the design, investment and operation mode of the entire cooling system. Heating equipment is generally divided into two situations. One is effective heat energy, such as the hot water system of a boiler. The heat generated by itself is used as other energy input. The second is ineffective heat energy, such as an iron-making blast furnace. The temperature of the molten iron continues to rise during the smelting process, and the heat energy is transmitted outwards to hold the capacity, that is, the blast furnace. If it melts, it will not work. It is necessary to guide the heat energy released by molten iron in time to ensure the smooth progress of production. No matter which method is used, it is necessary to discharge the heat energy in a timely, complete and efficient manner.

3. Pipeline system

As a highway for circulating media, the pipeline system acts as a channel to ensure that the fluid flows along the established route and restrains it from exceeding the limit. This is easy for everyone to understand, just like the water pipes and gas pipes at home. Common ones are steel pipes, plastic pipes, stainless steel pipes, cast iron pipes, cement pipes, other metal pipes, etc.

4. Closed cooling tower

The closed cooling tower is the terminal equipment that transfers heat energy to the outside world and is the heat energy releaser of the entire system. It transfers the heat energy brought out by the circulating medium to the outside atmosphere, which is the last step of the cooling system. The most commonly used in industry is the counter-flow closed cooling tower. According to different processes and site requirements, composite flow and cross-flow closed cooling towers are also used.

5. Stabilized water supply system

It mainly plays the two roles of voltage stabilization and water replenishment. A closed cooling system generally consists of a pressure stabilizing tank, a water replenishment pump, a water tank and a control system. Measure the water pump inlet pressure value and automatically start the water replenishing pump according to the set parameters to ensure the stability of the system pressure. This system can also be used as a rehydration system for small leaks during operation. However, during the initial operation of the system, an additional water replenishment and addition system is generally set up in the pipeline system to ensure that a large amount of water filling work can be completed quickly.

6. Affiliated systems

Facilities that ensure the stable operation of the entire cooling system, such as control systems, spray systems, filtration systems, online detection systems, dosing equipment, descaling equipment, exhaust systems, etc. In particular, the control system has different requirements, usually direct start or star-delta, soft start device. If the energy saving requirements are high, frequency converter, remote control, host computer connection, wireless monitoring and other requirements may also be used. Investment costs also vary widely.

Closed cooling tower process flow

1. Internal circulation

It is connected with the production heating equipment to form a closed circulation system to cool the process equipment and take the heat energy in the production equipment out to the outside world. The internal circulation is used as a heat exchange tube bundle in the closed cooling tower to complete the functions of closed circulation and cooling. The tube bundle material is generally a metal with high thermal conductivity, such as copper, stainless steel, titanium alloy, copper tube, etc.

2. External circulation

In a closed cooling tower, in order to transfer heat energy to the outside world, it needs to be transmitted through a medium, which is the spray water system outside the heat exchange tube bundle. It pumps water from the bottom of the tower or a centralized pool and sends it to the spray pipe on the upper part of the heat exchange tube bundle. Through the nozzle, it effectively sprays onto the heat exchange tube bundle to form a water film, which absorbs the heat energy of the high-temperature medium in the tube bundle and converts it into vaporization latent heat and becomes steam.

3. Wind system

The exhaust system brings the water vapor evaporated from the external circulation out of the tower, realizing the final transfer of heat energy. The fan provides power and sucks dry and cold air from the bottom or side of the tower. After convection heat exchange with the spray water, it passes through the heat exchange tube bundle at high speed, entraining the steam out of the tower and turning into high-enthalpy gas and discharging it into the atmosphere.

4. Electrical system

Control the cooperative work of various electrical components, and adjust the working status of the fan and spray pump according to the temperature of the inlet and outlet water in the internal cycle and compare it with the preset parameters to achieve water and energy saving effects as much as possible.