Dual-zone high back pressure variable working condition adjustable heat supply and pure condensing dual-purpose condensing steam heat exchange energy-saving device

Abstract

The invention relates to a dual-zone high-backpressure variable-working-condition adjustable heating and straight condensing dual-purpose steam condensing heat exchange energy-saving device. The dual-zone high-backpressure variable-working-condition adjustable heating and straight condensing dual-purpose steam condensing heat exchange energy-saving device comprises a steam turbine, wherein the steam turbine is connected with the upper part of a steam condensing heat exchange device through a steam exhaust pipe. The dual-zone high-backpressure variable-working-condition adjustable heating and straight condensing dual-purpose steam condensing heat exchange energy-saving device is characterized in that the steam condensing heat exchange device consists of a cooling zone I and a cooling zone II which are mutually independent, a water outlet end of the cooling zone I is connected with a heat supply network circulating water supply pipe, a water inlet end of the cooling zone I is connected with a heat supply network circulating water return pipe, the water inlet end is also connected with a water cooling tower through a first water cooling tower circulating water outlet pipe, a water inlet end of the cooling zone II is connected with the water cooling tower through a second water cooling tower circulating water outlet pipe and the water outlet end of the cooling zone II is connected with the water cooling tower through a water cooling tower circulating water return pipe. The dual-zone high-backpressure variable-working-condition adjustable heating and straight condensing dual-purpose steam condensing heat exchange energy-saving device has the beneficial effects that the safety of a backpressure heating unit is improved, the flexibility of the backpressure heating unit is improved to the utmost extent and the maximization of heating benefits is realized.

Description

(1) Technical field [0001] The invention relates to a cogeneration unit steam turbine supporting device, in particular to a dual-zone high back pressure variable working condition adjustable heat supply, pure condensation dual-purpose condensing steam heat exchange energy saving device. (2) Background technology [0002] At present, in the field of urban central heating, when low vacuum circulating water heating and high back pressure circulating water heating are used, the exhaust steam of the steam turbine directly heats the circulating water of the heating network in the condenser to achieve full recovery of exhaust steam and cold sources. For the purpose of zero loss, the cycle thermal efficiency can reach about 95%, and the heating area is twice that of the ordinary extraction steam heating unit. A 300MW high back pressure unit can provide as much as 60,000 tons of media in a heating season than a condensing cogeneration unit, which is one of the best technical solutions tha...

AI Technical Summary

Problems solved by technology

However, there are also some disadvantages: 1. When the heating area is not large enough, the unit cannot carry a higher load, which affects the economy of the unit; If it does not go up, it will greatly affect the economy of the unit; 3. If there is a heating network accident during the heating period of the unit, such as the tripping of the circulating water pump, the sudden short circuit of the secondary station of the heating network, etc., it will cause the back pressure of the unit to increase rapidly. Put oil into operation or stop

This will not only affect the power generation efficiency of the unit, but also affect the dispatching and operation safety of the heating network in serious cases, and affect the heat supply of the entire city

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