The working steam quality has a great influence on the actual pumping performance of the steam jet pump. The so-called steam quality mainly refers to the steam dryness (or humidity) and temperature. Steam jet pump working steam should be dry or slightly superheated steam. In order to ensure the quality of the steam injection pump for steam supply and make the system work normally and effectively, the steam supply system should be provided with devices as required: 1) steam temperature reduction and overheating device. Generally, the steam of the heating network (the superheat is often higher than 100 ° C), must be cooled down. Usually, a "steam automatic desuperheating device" can be added to the steam pipe network. On the contrary, if it is self-provided boiler for steam, in order to ensure that the working steam has a degree of superheat and dryness, the boiler should be installed on the road for the superheater. 2) water separator. Normally, for boiler feed systems without superheaters, the steam supplied to the boiler outlet is often more than 4% wet. However, after the steam supply pipe is cooled, the steam humidity may be much higher than 4% especially when the ambient temperature is low and the long-distance pipeline is supplying steam. In this case, a water separator should be set so that the working steam humidity Drop below 2%. 3) steam emissions and muffler. The main function of the steam discharge device is to discharge the initial condensate and humid steam from the steam supply manifold to the steam supply system when the steam supply starts. The large amount of initial water is often the main cause of water hammer in the steam supply system. Secondly, the steam discharge device can also prevent the phenomenon of sudden pressure surge in the boiler and gas supply pipe network when the vacuum system stops pumping rapidly. In order to reduce the noise during steam discharge, muffler can be installed at the discharge port. Silencers can also be installed at the exit of the last injector. 4) was pumping gas cooling and dust removal device. The suction capacity of the steam jet pump decreases with the temperature of the drawn gas. In order to effectively exert the pumping capacity of the steam jet pump, when the temperature of the gas to be drawn is high, a water cooling device should be provided on the pipe before the gas to be drawn into the pump exhaust system to cool the gas to be drawn. Practice shows that if the exhaust gas containing dust often become the source of pumping system failure. For example, dust deposits in pipeline elbows, valves, and injectors cause air flow to clog, valve failure, and injector exhaust deterioration. Therefore, it is necessary to set an effective dust removal device on the suction pipe of the jet pump. Multistage steam jet pumping system in addition to the above-mentioned components of the device, but also includes vacuum valves, water supply systems, metering and control systems. For large displacement vacuum exhaust systems, the high vacuum stage can be designed to run side-by-side (main pump, sub-pump series) or with multiple pumps in parallel, so that the single pump geometry is not too large, Changes in suction load parallel pump open stop the number of effective use of energy and save energy.
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