Heat network grading heating system using small steam turbine and adjusting method thereof

Abstract

The invention provides a heat network grading heating system using a small steam turbine and an adjusting method thereof which are reasonable in design, reliable in performance and beneficial to achieving recovery and utilization of available energy in a heat supply unit. A thermoelectric unit system comprises an extraction condensing steam turbine, a main condenser, a condensate water pump, an eight-level low pressure heater, a seven-level low pressure heater, a six-level low pressure heater and a five-level low pressure heater. A heat supply system comprises a heat network water return pipe, a heat network water supply pipe, a heat network circulating water pump, a secondary condenser, a hydrophobic heat network heater, a heat network heater, a plant service generator, the pure condensing small steam turbine and a vacuum pumping device. In the heating initial stage or last stage, heat network returning water is conveyed to the secondary condenser to be heated through the heat network water return pipe, then passes through a second heat network water bypass to be conveyed to the heat network water supply pipe, and then is conveyed to a user through the heat network water supply pipe to conduct heating. In the heating high cold stage, the heat network returning water is primarily heated through the secondary condenser, then is subjected to secondary heating through the heat network heater, and then is conveyed to the user to conduct heating.

Description

technical field [0001] The invention relates to a heat network graded heating system utilizing a small steam turbine and an adjustment method thereof, belonging to the technical field of cogeneration of heat and power. Background technique [0002] Fagai Nengli [2016] No. 617 "Notice on Printing and Distributing the "Management Measures for Cogeneration of Heat and Power"" requires: strive to achieve a centralized heat supply rate of more than 60% in cities with a population of more than 200,000. Full coverage. This indicates that the development of combined heat and power will enter a period of rapid development. And as my country's policy gradually attaches importance to the promotion of new energy, the proportion of thermal power units participating in peak regulation has gradually increased, making the units operate at low load for a long time. At present, the traditional central heating method is that the unit heats and extracts steam to be heated in the heat network ...

AI Technical Summary

Problems solved by technology

[0003] For the existing heating units, the design heating steam pressure is 0.2-0.5MPa, but in actual operation, especially at the beginning and end of heating, the required temperature of the heating network water is generally only about 70-90°C. There is a large loss of available energy between the steam

Moreover, there are currently no effective measures to recycle them

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