Multi-stage steam extraction back pressure type small steam turbine graded heat regeneration and heat supply system and method

Abstract

The invention relates to the technical field of thermal power generating unit heat supply, in particular to a multi-stage steam extraction back pressure type small steam turbine graded heat regeneration and heat supply system and method. The multi-stage steam extraction back pressure type small steam turbine graded heat regeneration and heat supply system comprises a small steam turbine, a graded heat regeneration system and a heat supply system, wherein the small steam turbine is used for dragging power equipment and provided with a steam inlet, a steam exhaust outlet and a plurality of steam extraction outlets, and the steam inlet is connected with an intermediate pressure cylinder of the main steam turbine; the graded regeneration system involves a condensate water pump, a front low-pressure heater and a plurality of low-pressure heaters which communicate in sequence; the heat supply system involves a heat supply network circulating water pump, a heat supply network condenser, a plurality of steam extraction heaters and a heat supply network heater which communicate in sequence; and the steam exhaust outlet is connected with the front low-pressure heater or the heat supply network condenser, and the steam extraction outlets are connected with the low-pressure heaters and the steam extraction heaters in a one-to-one correspondence mode correspondingly. The system not only provides dragging power for the power equipment, but also achieves heat supply in winter and heating of condensed water of a main steam turbine through regenerative heat in summer at the same time, and utilizes steam exhaust waste heat of the small steam turbine in a full cycle.

Description

technical field [0001] The invention relates to the technical field of thermal power unit heating, in particular to a multi-stage extraction back pressure type small steam turbine grading heat recovery and heating system and method. Background technique [0002] Cogeneration is recognized at home and abroad as an important means to achieve energy saving and emission reduction. However, pure condensing thermal power generating units are developing rapidly, with a serious excess of installed capacity, and a serious shortage of central heating from cogeneration, accounting for less than 1 / 3 of the national heating and heating supply. In order to speed up the development of cogeneration, it is necessary to further optimize the resource allocation of existing thermal power units, give full play to the social benefits of existing thermal power generation equipment, and carry out heat supply transformation for existing pure condensing thermal power units. If the traditional medium...

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a multi-stage steam extraction back pressure small steam turbine staged recuperation and heating system, which aims to solve the problem that the continuous drag of the power equipment of the existing power plant and the heating demand of seasonal residents cannot be satisfied at the same time

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