Efficient heat supply system arranged in secondary reheating unit

Abstract

The invention discloses an efficient heat supply system arranged in a secondary reheating unit. The efficient heat supply system comprises a small steam turbine, a clutch gear box, a motor / generator and an induced draft fan; a rotating shaft of the small steam turbine is connected with the clutch gear box, one side of the clutch gear box is connected with the small steam turbine, and the other side of the clutch gear box is connected with a rotating shaft of the motor / generator; and the motor / generator is connected with the induced draft fan, the small steam turbine and the clutch gear box arecoaxially connected with the motor / generator and the induced draft fan, the motor / generator is electrically connected with a station service bus, and a steam exhaust port of the small steam turbine is connected with the heat supply steam manifold. According to the efficient heat supply system arranged in the secondary reheating unit, the problem of insufficient reheat steam temperature can be relieved, and the reheat steam temperature regulation stability is facilitated; and meanwhile, heat is supplied to the outside, parameters of heat supply system meet the use requirements of other parts of equipment of a power plant, redundant steam can be directly reused, high-quality steam is extruded to do work, and the utilization rate of heat energy is increased.

Description

technical field [0001] The invention mainly relates to the field of heating systems of power plants, in particular to a high-efficiency heating system placed in a secondary reheating unit. Background technique [0002] Due to the continuous and rapid development of my country's economy, it is difficult to change the domestic energy structure that relies on coal power in a short period of time. As a large resource consumer, the thermal power industry must adhere to a sustainable development path that coordinates society, economy, resources, and the environment. For this goal, the National Energy Administration has also issued a number of energy-saving and emission-reduction plans, and coal-fired power generating units are developing in the direction of large capacity, high parameters, and double reheating. While improving the efficiency of the unit and reducing the coal consumption of power supply, higher requirements are put forward for the flexibility of the unit. How to im...

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Problems solved by technology

[0003] Conventional steam-driven induced draft fans operate with low efficiency of small and medium-sized steam turbines, saving electricity but not energy; conventional heating solutions use rotating partitions, pressure If the induced draft fan exhausts steam for heat supply, it is necessary to add a set of start-up steam source pipeline or add an electric induced draft fan as a start-up backup. Control of hot steam temperature

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