Adjustable ejector for middle-high-pressure industrial steam supply and adjusting method thereof

Abstract

The invention provides an adjustable ejector for middle-high-pressure industrial steam supply and an adjusting method thereof. The ejector sequentially comprises a receiving section, a mixing sectionand a pressure diffusing section; the upper side of the receiving section is provided with a power steam inlet, and the lower side of the receiving section is provided with a low-pressure steam inlet;an adjusting valve rod is arranged in the ejector in a penetrating mode, an adjusting actuator is arranged at the front end of the receiving section, and one end of the adjusting valve rod is arranged in the adjusting actuator; and a sealing assembly is arranged between the adjusting actuator and the receiving section, and a leaked steam adjusting assembly is arranged between the sealing assemblyand the mixing section and used for guiding leaked steam to the mixing section. The adjustable ejector for middle-high-pressure industrial steam supply has the beneficial effects that the sealing pressure difference is reduced through a leaked steam guiding pipeline, the steam leakage phenomenon of the high-pressure adjusting valve rod is fundamentally solved, and meanwhile the service life of packing is prolonged.

Description

technical field [0001] The invention belongs to the technical field of heat supply and power generation, and in particular relates to an adjustable ejector for medium and high voltage industrial steam supply and an adjustment method thereof. Background technique [0002] As the country pays more and more attention to energy conservation and environmental protection, more and more coal-fired power generation enterprises have carried out combined heat and power transformation. Combined heat and power is one of the important means to save energy and improve the economy of units, and it is also a key to promoting sustainable social and economic development. important measure. For southern regions without central heating, combined heat and power generation is mainly implemented through industrial steam supply transformation. [0003] The industrial steam supply transformation of the original pure condensing thermal power unit can generally adopt the following three methods: [...

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Problems solved by technology

[0004] 1) The flow part of the unit is modified and installed with a rotating baffle to replace it with an adjustable extraction steam turbine. This modification method has strong applicability. All units can be modified by this method, but the modification cost is high, and the intermediate pressure cylinder rotor and Cylinders are remanufactured

2) Select a steam source with higher parameters and supply steam through a temperature and pressure reducer. This method is simple, but the thermal efficiency is low, because the temperature and pressure reduction cause the loss of useful energy of the steam, and the efficiency is low, but the transformation cost of this method is low

3) Use a steam ejector to match the steam higher than the heating pressure to suck the steam lower than the steam supply pressure, and then mix it for industrial steam supply, but this method has poor adaptability to fluctuations in unit load and industrial steam supply heat load

Especially for high and medium pressure industrial steam supply, an adjustable ejector is used, but the existing ejector adopts a single-stage sealing form with a common packing structure, and the sealing effect for low pressure is not bad. When the power steam pressure is high, The sealing effect is average; at the same time, the single-stage seal adopts multi-layer and different forms of sealing for high-pressure sealing, and the packing needs to be replaced continuously. The cost of the sealing structure is high, and finally the phenomenon of steam leakage cannot be eliminated

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