Negative pressure steam heating apparatus and heating method thereof

Abstract

The invention provides a negative pressure steam heating apparatus and a heating method thereof. The negative pressure steam heating apparatus comprises a first heat exchanger and a second heat exchanger, wherein the first heat exchanger and the second heat exchanger form enclosed space together. High pressure steam flowing through the shell of the first heat exchanger and having a first temperature exchanges heat with a first fluid flowing through a heat exchange tube of the first heat exchanger so as to produce negative pressure steam with a second temperature; the shell of the second heat exchanger receives the negative pressure steam which exchanges heat with a concentrate flowing through a heat exchange tube of the second heat exchanger, and the concentrate absorbs heat to heat a material solute to a third temperature; and the negative pressure steam in the shell of the second heat exchanger releases heat energy and is then converted into the first fluid which flows back to the first heat exchanger. According to the invention, through two heat exchange procedures of the first heat exchanger and the second heat exchanger, the material solute is mildly heated to a preset temperature, so situations like oxidation, deterioration and material loss of the material solute in the process of heating are avoided.

Description

technical field [0001] The invention relates to the technical field of concentration or residue removal, in particular to a negative pressure steam heating device for concentration or residue removal. Background technique [0002] At present, in traditional concentration or residue removal applications, two methods are mainly used: one is to use direct heating of high-temperature steam to heat the material solute in the extract or concentrate to separate the solvent and the solute. However, the heating temperature in this method is difficult to control, which tends to cause oxidation, deterioration and material loss for those material solutes that are not resistant to high temperatures; the second is to use the water bath method, however, at the same heating temperature Under conditions, the enthalpy of water is much smaller than that of high-temperature steam, for example, resulting in lower working efficiency of the water bath heating system. In addition, the water bath h...

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Problems solved by technology

However, the heating temperature in this method is difficult to control, which tends to cause oxidation, deterioration and material loss for those material solutes that are not resistant to high temperatures; the second is to use the water bath method, however, at the same heating temperature Under conditions, the enthalpy of water is much smaller than that of high-temperature steam, for example, resulting in lower working efficiency of the water bath heating system

In addition, the water bath heating method needs to add hardware facilities such as water storage tanks and circulation pumps, which has high heating costs, and will consume a lot of water resources and consume a lot of energy.

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