2BW9 roots water ring vacuum pump unit was officially put into use in the condenser vacuum pump unit of unit 4 # of Shajiao A power plant

luwei • 03/02/2017 09:25 • Case, Engineering services, Pump

Shajiao Power Plant is the largest thermal power plant in South China, with a total installed capacity of 3.88 million kilowatts, providing solid support for the rapid economic development of the Pearl River Delta region.

The two water ring vacuum pump sets originally configured for unit # 4 of Shajiao A power plant have high power and low efficiency. The motor power is 160kW, the normal operating current is 250A, and the power consumption is 131kw. In fact, a certain amount of dry air will leak during the normal operation of the unit. The water ring vacuum pump set was originally used for pumping to maintain the vacuum of the condenser, but since the saturated steam pressure of water has approached the back pressure value of the condenser, As a result, the operation efficiency of the water ring vacuum pump group is low, a lot of useless work is done in vain, and a lot of waste is caused.

(above: overlooking Shajiao Power Plant in the distance)

Now, a roots water ring vacuum pump is added to replace two vacuum pump sets with larger power, which are used to maintain the vacuum of the condenser. The original water ring vacuum pump set is used as a standby and during the startup and shutdown of the generator set.

Kenflo will provide a complete set of roots water ring vacuum pump set according to the technical requirements of Shajiao A power plant and the actual situation of relevant equipment systems, and deliver it to Shajiao A power plant for normal use after installation and commissioning.

Unit # 4 of Shajiao A power plant is a 330MW generator unit produced by Shanghai steam turbine works. The condenser vacuum pumping system is equipped with two water ring vacuum pumps in total. The motor and vacuum pump are directly connected. When the unit is started, two pumps operate at the same time. After the generator unit operates under normal operating conditions, one water ring vacuum pump operates, one for use and one for standby. The circulating water system is open circulation of Pearl River water.

Nameplate parameters of water ring vacuum pump are as follows:

Model: 2BW4 353-0el4

Speed: 590rpm

Pumping speed: 36.5-89.0m3/min

Suction absolute pressure - 33 － 1013hpa

Exhaust absolute pressure - 1013hpa

Water supply - 4.0 ~ 13.0 m3 / h

Nameplate parameters of supporting motor of water ring vacuum pump are as follows:

Motor model - Y355L2-10

Rated power: 160kW

Rated current : 328A

Power factor -: 0.80

Speed: 590rpm

The current of the original two water ring vacuum pumps in normal operation is about 250A (data of a single unit), and the conversion success rate is 131kw (data of a single unit).

This time, a set of 2BW9 roots water ring vacuum pump unit produced by Kenflo was added, and Kenflo's 2BW9-202-0ED2-0Y980 roots water ring vacuum pump unit was selected. It has been tested by Kenflo's unique wet vacuum pump test platform to simulate the actual working conditions of the power plant, and has also been verified by many users on the spot. Large air extraction and high vacuum.

Kenflo, based on more than 40 years of experience in providing vacuum units for thermal power plants, especially Kenflo's experience in energy-saving transformation of roots water ring vacuum pump complete sets in Dalian Power Generation Co., Ltd., Hebei Construction Investment Renqiu Thermal Power Co., Ltd., Liaoning Datang International Jinzhou Thermal Power Co., Ltd., Datang Harbin first thermal power Co., Ltd. and other project customers, has added filters Pressure reducing valves, check valves, solenoid valves, and various manual valves, as well as important valves and instruments, are all high-quality products to ensure stable use and convenient maintenance.

The roots pump in the 2BW9 roots water ring vacuum pump unit adopts ZJQ-600 air-cooled Roots pump with small gap control, and the influence of temperature change on the gap during the operation of the roots pump is considered to ensure that the roots pump can operate efficiently under various working conditions.

Kenflo's improved 2BE1-202 water ring vacuum pump is adopted for the water ring vacuum pump, which is different from the ordinary water ring vacuum pump. The improved 2BE1-202 water ring vacuum pump adopts the structure of four bearings, adopts the double eccentric design of the rotor, and can select the appropriate eccentricity of the rotor according to the dry air leakage of the user and the performance of the roots pump, so as to ensure proper matching between the roots pump and the water ring vacuum pump and stable operation.

The newly added 2BW9 roots water ring vacuum pump unit was commissioned on March 2, 2017, passed the test run and put into normal use. The newly added 2BW9 roots water ring vacuum pump unit can maintain the vacuum of the condenser, greatly reduce the power consumption and save about 70% energy. It has been highly praised by users.