JPS6073099A - Steam ejector - Google Patents

Abstract

PURPOSE:To reduce consumption of steam considerably by employing a tapered diffuser tube having high reduction ratio of flow path area in a steam ejector thereby eliminating necessity of double step compression of booster and ejector. CONSTITUTION:The area ratio of nozzle throat 8 and diffuser throat section 4 or the area reduction ratio of a diffuser 3 is reduced in the range of 1/2.5-1/6. When discharging mist produced through adiabatic expansion of operating steam or eliminating hindrance to pressure recovery in the diffuser caused by mist adhered to the inner wall of said tube 3, consumption on steam can be reduced more than 50% resulting in usage of steam having pressure lower than 4kg/cm<2>.

Description

[Detailed description of the invention] The steam ejector injects operating steam into the differential user at high speed from a steam nozzle installed just before the differential user, and by this high-speed steam jet flow, the suction chamber is It sucks and mixes oil, gas, paper, etc., and then spreads out through the differential user throat section and guides it to the differential user, converts velocity energy into pressure energy, and releases it from the end of the differential user to generate a vacuum.

The area ratio of the unopened portion of the differential user in the currently used ejector is tapered due to the generation of mist due to adiabatic expansion passing through the interior, and the area reduction rate of the differential user is as follows:
It has been tested experimentally and is all manufactured as 1-ro.

On the other hand, since the area ratio of the nozzle throat and the differential user throat part to obtain a high vacuum of 5%H1 or more is the narrowing differential user reduction ratio %, this throat area ratio is 3.
As a result, it becomes necessary to employ two-stage compression using a booster and an ejector to compress the condenser's back pressure from 40 to 50%l 84. . .

This ejector is designed to discharge mist generated by the adiabatic expansion of operating steam to the outside of the system, or to reduce pressure within the differential user due to the mist that grows by adhering to the inner wall of the unopened differential user pipe. By eliminating as much of the impediment to rolling as possible, it becomes possible to reduce the area reduction ratio, which was traditionally considered to be 1/2, to within 145 to 1/6, resulting in a reduction in area of 50 Conventionally, both the booster and ejector required a steam pressure of 7 kg/crtt G or more, but this ejector requires a steam pressure of 4 kg/crtt G or more.
It is now possible to handle vapor pressures of g/cni G or higher.

Actually, the operating data confirmed by the device is as follows.

・Suction vacuum 3% level ・Radiation vacuum 40% level・/Pre-steam pressure 3kgAntC, -・Def user unopened pipe steam flow path reduction area ratio 1ro

[Brief explanation of drawings]

Figure 1 shows a special steam ejector, and the names for the volumes in the figure are as follows: 1 Bleed gas, vapor population 2 Steam inlet for operation 3 Steam nozzle for operation 4 Suction chamber 5 Tapered differential user 6 Defer user slow 1- 7 Spreading differential user 8 Names carved into logarithms in the drawing showing the ejector-outlet ratio as follows: l Extraction gas, vapor population 2 Suction chamber 3 Tapering differential user 4 Defining user throat 5 Spreading differential user 6 Steam inlet A Steam nozzle 8 Steam nozzle diameter 9 Tapered differential user internal steam reaching point equivalent diameter IO differential user throat diameter The area ratio in the explanatory text is as follows: Ichimame throat area ratio (8) 2 Patent applicant Shigeru Mitsuoka 1]2 Factor 1

Claims (1)

[Claims] Differential steam ejector differential user A special steam ejector 0 for high vacuum generation, which is characterized by a large flow area ratio of unopened pipes compared to conventional ejectors.