Steam heating system

Abstract

The invention relates to a steam heating system. The steam heating system comprises a desuperheater comprising a temperature reduction tank, and a plurality of heat exchangers communicated with the temperature reduction tank; and superheated steam is inputted into the temperature reduction tank and can be subjected to water bath in the temperature reduction tank and is converted into saturated steam; the saturated steam, adopted as a heating medium, is transferred to the heat exchangers. The plurality of heat exchangers share one desuperheater, and therefore, cost can be decreased, and an excellent heating effect can be realized.

Description

technical field [0001] The invention relates to a thermal energy engineering technology, in particular to a steam heating system. Background technique [0002] Water vapor is often used as a heat medium to heat materials. The pipeline for transporting water vapor from the boiler to the heat exchange device is long. Generally, the steam is heated in the boiler to become superheated steam before being input into the pipeline. distance transport. The water vapor is sent to the heat exchanger to exchange heat with the material input into the heat exchanger. The water vapor is condensed into condensed water after heat exchange, and the condensed water is discharged from the heat exchanger through the drain device of the heat exchanger. [0003] In a pulverized coal gasification process, nitrogen and backflush gas (the backflush gas is used to purge the parts of the synthesis gas channel where coal ash is easy to accumulate, and the backflush gas can also be nitrogen) need to b...

AI Technical Summary

Problems solved by technology

[0004] Since the reverse blowing gas enters the second heat exchanger in a pulsed manner, the heat load in the second heat exchanger changes greatly and quickly, the input pressure of superheated steam is high, and the control of the second regulating unit is relatively simple, resulting in the Hydrophobic device is easily damaged

In addition, the superheated steam will also form a temperature gradient on the heat exchange surface of the second heat exchanger, which will generate thermal stress and make the second heat exchanger more likely to be damaged

In particular, the heat transfer coefficient of superheated steam is low and variable during the heat exchange process, and it is difficult to measure accurately, which makes it difficult to select the second heat exchanger and be accurately controlled

In addition, due to the low heat transfer coefficient of superheated steam, the second heat exchanger has more heat transfer surfaces and a larger volume

[0005] The above defects can be overcome by refitting the second heat exchanger to use saturated steam for heating, but due to the small amount of backflush gas, it is not economical to add a desuperheater for the second heat exchanger alone to provide saturated steam

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