Improvement of arrangement for including water-jet ejector in CHP operation cycle

Abstract

The question of the reliability of the operation of the exhaust devices almost always remains relevant during the operation of vacuum deaeration plants, since incorrect operation of the exhaust device entails violations of the vacuum deaeration process. As devices for the removal of non-condensing corrosive gases from vacuum deaerators, jet exhaust devices-ejectors are used, in which the kinetic energy of one stream is transferred to another stream by direct contact (mixing). According to the working body, ejectors are divided into water-jet and steam-jet. In this paper, the current scheme of inclusion of a water-jet ejector in the operation cycle of the Ulyanovsk CHP-2 is considered, problems and shortcomings of the scheme are identified, technical devices and their characteristics are described. The results of tests to determine the temperature and flow rate of the source water supplied to the gas separator tank to ensure stable operation of the EV-340 ejector are presented, which showed that the actual flow rate of the source chemically purified water to the gas separator tank is 17 m3/h, and the water temperature in the gas separator tank reaches 37°C, which exceeds the permissible temperature of the working water of the ejector by 7°C. An improved arrangement for the inclusion of a water-jet ejector in the operation cycle of the CHP is proposed, which provides sufficient cooling of the working water of the water-jet ejector by mixing this water with the source water, which is further cooled in the cooling tower. It is estimated that the new improved arrangement gives an economic effect of 2,5 million rubles/year.