Condensed water is produced in the process of steam heating and transportation, so it not only has good water quality but also contains a lot of heat. YTLH type closed condensate recovery equipment is the key equipment of steam condensate recovery system, which can be widely used for closed condensate recovery by steam heating system in industrial enterprises in papermaking, chemical industry, food, pharmacy, grain and oil processing, rubber, cotton spinning, printing and dyeing, wood industry and other industries, and can also be used for steam condensate recovery in hotels, hospitals and their civil buildings. It can conveniently and effectively change the condensate produced by indirect steam heat exchange system into closed recovery, and it is an updated product of conventional traditional open recovery condensate tank.
principle of operation
How to effectively recover low-pressure steam condensate that can not be directly used under various pressures has always been a major problem for thermal energy management departments in all walks of life. Over the years, the R&D team has applied the principles of fluid mechanics, single-phase flow and two-phase flow, based on the micro-supercooling theory and the dynamic two-phase flow characteristics of high-temperature condensate, combined with years of research on boiler equipment, systematically applied the mixed flow technology of steam-water co-injection, high-low pressure pipeline network technology and steam kinetic energy automatic pressurization technology, successfully led the high-temperature condensate back to the condensate recovery device with low or no back pressure, and at the same time adopted special cavitation elimination components to eliminate the causes of pump cavitation. At the same time, relying on the practical experience of the industry, the recovery equipment is continuously improved and upgraded, and the secondary flash steam of condensed water is fully recovered, so that the energy recovery utilization rate can reach over 95%, the loss and thermal pollution of softened water can be reduced, and fuel and softened water resources can be fully saved.
main feature
Closed condensate recovery device is a new type of high-efficiency energy-saving and environmental protection equipment, which is superior to similar products in the market and has the following characteristics compared with other similar products:
1, saving energy and reducing consumption, and reducing operating costs.
Closed condensate recovery equipment reduces the leakage of secondary flash steam and water, so that condensate and heat energy are fully recovered, the boiler feed water temperature is increased, the thermal efficiency of the system is increased by more than 25%, fuel is saved by 20%, and softened water is 90%; Reduce the investment and operation cost of water treatment equipment; Frequency conversion/step-down technology is adopted, which greatly reduces the running electricity cost of the machine;
2, high degree of automation, suitable for different working conditions
Electromechanical integration design, adopting Omron high-sensitivity liquid level sensor control, automatic pressure regulation, automatic alarm, automatic switching of double pumps and other technical measures to form multifunctional automatic control, which can realize automatic water replenishment without manual attendance, and ensure the safe, reliable and stable automatic operation of the equipment under harsh working conditions such as high temperature and high humidity;
3, energy conservation and environmental protection, improve environmental quality.
The use of closed condensate recovery equipment reduces the emissions of thermal pollution and noise pollution, such as SO2 and NOX, and reduces environmental pollution. At the same time, improve water conditions to ensure smooth water delivery;
4. Prevent cavitation and prolong the service life of equipment and pipelines.
At the same time, the water quality equipment is completely sealed, which eliminates the pollution of water-soluble corrosive gases such as oxygen and carbon dioxide to condensed water, eliminates oxygen corrosion, maintains the good quality of condensed water, and prolongs the service life of equipment and pipelines.
5. The whole machine is easy to install and has strong adaptability.
The whole machine is integrated, with exquisite design, compact structure, small occupied space, combined steel structure base, convenient installation and maintenance, and low failure rate; It is not only applicable to new enterprises, but also to the technological transformation of old enterprises.
Classification of condensate recovery devices:
I. Open the condensate recovery device.
The open condensate recovery device centrally recovers the steam condensate discharged from the steam equipment to the open-air underground pool through the trench pipeline. The steam carried by the condensate and the secondary steam flashed after being evacuated or depressurized to normal pressure are utilized. The remaining condensate at about 100℃ is cooled to below 70℃ by natural cooling or adding condensate, and then pumped into the soft water tank of boiler make-up water.
The condensate recovery device of the opener can be divided into the following three ways.
1. 1 pump high natural cooling opener
The main working principle of the system is to recover the condensed water from the trench to an open underground pool, and then pump it into the replenishment tank. Because the position of the pump is higher than the ground, according to the influence of centrifugal pump performance, the recovered water temperature is generally 40℃ ~ 60℃. The heat loss taken away by flash evaporation accounts for about 4% ~ 10%. So the heat loss is great.
1.2 low-pump natural cooler.
Its working principle is basically the same as that of the high-position pump, except that the pump is placed in the pit below the sump. According to the influence of centrifugal pump performance (see table 1 on page 32), the recovery temperature can be increased to 80℃. However, because the pump is placed in the pit, the equipment maintenance is very inconvenient, so few manufacturers adopt this method.
Expansion and utilization of 1.3 high-pressure condenser
Its working principle is to use the steam leakage of high-pressure steam equipment, the flash steam of condensate is used by low-pressure steam equipment, and the low-pressure condensate returns to the pool, and then it is recovered naturally or by adding cold water below 70℃. The recovery rate of this condensate recovery device is higher than the first two, but the investment is relatively large. Not many factories adopt this method.
Second, the closed condensate recovery device
Closed condensate recovery device means that the condensate discharged from steam equipment is concentrated back to the closed centralized water tank through overhead or trench pipelines, and then the softened water with the temperature above 100℃ is directly input into the boiler by using the high-temperature condensate comprehensive recovery device, forming a closed circulation system from steam supply to recovery, which is a better condensate recovery method at present. This condensate recovery device is widely used in Japan.
Closed condensate recovery device can be divided into the following two ways.
2. 1 The pump directly sends the condensed water to the boiler recovery system.
Its working principle is that saturated steam is sent from the boiler to the indirect steam heating equipment, and the saturated condensate produced after heat release is pressed into the overhead or buried backwater pipeline by steam pressure through the steam trap, and then collected into the centralized water tank through the pipeline. According to the steam pressure and condensate discharge of the equipment, the pressure of the water collecting tank is calibrated by the pressure regulating control valve to make it the lowest. When the saturated condensate in the water collecting tank reaches a high water level, the high-temperature condensate comprehensive recovery device will automatically start pumping water into the boiler. When the water level in the centralized water tank is pumped to a low level, the recovery device automatically stops running. If the water level of the boiler exceeds the warning water level without replenishing water, the boiler water level controller controls the recovery device to automatically pump the water back to the soft water tank.
2.2 High and low pressure recovery system
Its working principle is basically the same as the first closed recovery system, except that high-pressure steam equipment and low-pressure steam equipment need two recovery systems respectively.
2.3 High-temperature condensate comprehensive recovery device
The recovery method of closed steam condensate is to recover saturated water above 100℃. Generally, centrifugal pump will produce cavitation when transporting saturated hot water, which makes the pump unable to work normally. Serious cavitation will damage the pump impeller and cause accidents. According to the performance table of centrifugal pump (see table 1), general centrifugal pump can only suck supercooled water below 75℃. If the water temperature exceeds 80℃, it is necessary to add a positive pressure head at the pump inlet to prevent cavitation. In order to pump 100℃ ~ 120℃ saturated hot water, it is necessary to increase the positive pressure head at the pump inlet by 6.0m ~17.5m. In order to solve this problem, the condensate recovery device combines the jet pump with the centrifugal pump, which effectively solves the problem of cavitation prevention. The combination of this pump and other components is called high-temperature condensed water comprehensive recovery device.
Matters needing attention in equipment use
1. Before the system is put into operation, the whole system must be descaled. After the backwater is qualified, open and close the drain valve.
2. Before the container is filled with water, remove the pressure gauge, open the pressure gauge valve to discharge steam, and then install the pressure gauge when the water level pressure in the container reaches the upper limit;
3. After the system is put into operation, if there is a small amount of hard impurities in the return water, the drain valve must be opened every 3 ~ 5 days; Then it will be reduced to once a month;
4, when the alarm red light on the control cabinet or buzzer alarm, should choose to manually control the water pump to send water, maintenance personnel immediately repair the automatic control device, and then resume automatic operation after repair;
5. The steam traps supporting the user's pipeline system and condensate recovery device should be maintained and replaced regularly, and the damaged steam traps should be replaced immediately.
Daily maintenance
1, regularly open the drain valve to drain water to improve water quality.
2, regularly check the pipe network trap, if there is any damage, should be replaced in time.
3. Observe whether the liquid level display is correct, and keep it within 30 mm of the normal liquid level;
4. Wipe the level gauge regularly to make it clear.
5, pay attention to the maintenance and maintenance of motor pump.
The condensed water recovery device has realized the combination of economic benefits and social benefits and played an important role. The above is a brief introduction of the steam condensate recovery device, hoping to help you. If you have any other questions, you can continue to ask!