Back pressure machine work application device for supplying discharged steam of steam turbine high-pressure cylinder for industrial steam extracting system

Abstract

The invention provides a back pressure machine work application device for supplying discharged steam of a steam turbine high-pressure cylinder for an industrial steam extracting system. The back pressure machine work application device comprises an industrial steam extracting pipeline (5), an electric motor (9) and power equipment (10), wherein the industrial steam extracting pipeline (5) is provided with a back pressure machine steam inlet electric isolation valve, a back pressure machine main steam door and speed regulating steam door (6) and a steam supply temperature reducer (12), wherein the back pressure machine (7) and control equipment of the back pressure machine (7) are arranged between the back pressure machine main steam door and speed regulating steam door (6) and the steam supply temperature reducer (12), the back pressure machine (7) and the electric motor (9) are in coaxial arrangement at one side or two sides of the power equipment (10) and are connected with the power equipment (10) through an SSS clutch (8). Compared with the prior art, the back pressure machine work application device has the beneficial effects that the back pressure machine is additionally adopted, the partial industrially extracted steam is converted into effective applied work for outputting the power, in addition, the power equipment is dragged in a way of being coaxial with the electric motor, the industrial steam extracting throttling loss is reduced to the minimum degree, and the technical effects of obvious energy saving, consumption reduction, low carbon and environment protection are achieved.

Description

technical field [0001] The invention relates to a system for exhausting steam from a high-pressure cylinder of a steam turbine for supplying industrial steam, in particular to a working device for a back pressure machine used in a system for exhausting steam from a high-pressure cylinder of a steam turbine for supplying industrial steam. Background technique [0002] At present, most of the industrial steam used by Chinese enterprises is provided by the generator set of the thermal power plant. Generally, the industrial steam is provided by the high-pressure cylinder exhaust system of the generator set. Due to the high exhaust pressure and exhaust temperature of the high-pressure cylinder, the exhaust steam The steam pressure is 2.0MPa, and the exhaust temperature is above 300°C, while the steam supply pressure and temperature required for industrial steam are relatively low. Generally, the steam supply pressure is 1.4MPa, and the steam supply temperature is below 220°C. The...

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Problems solved by technology

On the one hand, the installation of a rear-mounted back pressure machine makes the equipment for driving the generator a large investment, and the corresponding electrical system is also relatively complicated, and it will also bring safety hazards to the power system of the power plant; on the other hand, When the rear-mounted back pressure machine is used to independently drive the auxiliary equipment, due to the large fluctuation of the industrial steam load, the stability of the operation of the auxiliary equipment is poor, so it cannot meet the requirements for the stability of the power equipment.

The second is to use a pressure matcher to use high-parameter extraction to pump low-parameter steam to reduce the consumption of high-parameter steam; When it is low, the suction coefficient of the pressure matcher will decrease sharply, and its suction capacity will also drop significantly, so that the heating capacity cannot meet the user's requirements

However, this invention also uses a pressure matcher to connect with the steam extraction port on the high-pressure cylinder of the steam turbine. Therefore, it is difficult to adapt to the greatly changing conditions of the load of the steam supply equipment when using the pressure matcher. When the load is relatively low, the pressure matcher The suction coefficient will be sharply reduced, and its suction capacity will also be greatly reduced, so that the heating capacity cannot meet the user's requirements

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