Graded drain and condensed water sensible heat cascade use relaxation heat setting machine

Abstract

The invention relates to a graded drain and condensed water sensible heat cascade use relaxation heat setting machine. In a fresh air preheater, fresh air flows through a low-pressure condensed water preheating section, an intermediate-pressure condensed water preheating section and a high-pressure condensed water preheating section in sequence, and then the fresh air enters an air-supplement port of the relaxation heat setting machine; a main drain pipe of a heat exchanger is connected with a high-pressure drain pipe, an intermediate-pressure drain pipe and a low-pressure drain pipe in parallel, and the high-pressure drain pipe, the intermediate-pressure drain pipe and the low-pressure drain pipe can be switched; an outlet of a high-pressure drain valve is connected to the high-pressure condensed water preheating section through a first condensed water recycling pipe; an outlet of an intermediate-pressure drain valve is connected to the intermediate-pressure condensed water preheating section through a second condensed water recycling pipe; an outlet of a low-pressure drain valve is connected to the low-pressure condensed water preheating section through a third condensed water recycling pipe; drain water of the high-pressure condensed water preheating section is also connected into an inlet of the intermediate-pressure condensed water preheating section; and drain water of the intermediate-pressure condensed water preheating section is also connected into an inlet of the low-pressure condensed water preheating section. The setting machine has the advantage of high heat efficiency, and residual heat of condensed water can be fully utilized.

Description

Technical field [0001] The invention relates to a relaxation heat setting machine, in particular to a relaxation heat setting machine for grading hydrophobic and condensed water sensible heat cascade utilization. Background technique [0002] The post-processing of polyester staple fiber often uses a relaxation heat setting machine. The inner cavity of the relaxation heat setting machine is equipped with a fan, a heat exchanger and a drying room for setting and drying the product. The suction port of the fan and the supplementary The air outlets are connected, the air outlet of the fan is aligned with the upper heat exchanger, the air outlet above the heat exchanger enters the drying room, and the air return and exhaust outlets are provided under the drying room, and the air outlet leads to the box through the exhaust pipe Outside the body, a manual control valve is installed on the exhaust pipe, and the air return port is also communicated with the suction port of the fan. The ...

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Problems solved by technology

[0003] The shortcomings of this relaxation heat setting machine are: (1) According to different products, there are three levels of steam pressure, but only one steam trap is installed, and the steam trap can only work normally under a certain pressure. , cannot maintain the pressure difference required for normal work, either the displacement is not enough, or the steam leakage is serious

(2) The waste heat of the condensed water discharged by the steam trap needs to be utilized by external users. When there is no suitable user, it will inevitably be emptied and wasted

(3) Pollutants carried by the return air are easily deposited on the heat exchanger, deteriorating the heat exchange efficiency

(4) Even if the waste heat of condensed water is used by flash evaporation, the temperature of the discharged condensed water is still 130°C to 150°C, and the loss of waste heat is large

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