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Phase-change heat-exchange type secondary steam heat recovery utilization method, apparatus and use thereof

A technology of secondary steam and phase change heat, applied in separation methods, indirect heat exchangers, heat exchanger types, etc., can solve the problems of low utilization rate of heat energy, unavailability, and small application range

Active Publication Date: 2009-07-08
DONGFANG ELECTRIC MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] Aiming at the current situation that the heat energy of the secondary steam can not be utilized, or the heat energy utilization rate is low, or the heat energy of the secondary steam can be efficiently utilized, but the application range is very small, the present invention proposes a phase-change heat recovery method for secondary steam heat energy recovery. Utilize method, device and application thereof, to overcome the above-mentioned problems that prior art exists

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  • Phase-change heat-exchange type secondary steam heat recovery utilization method, apparatus and use thereof
  • Phase-change heat-exchange type secondary steam heat recovery utilization method, apparatus and use thereof
  • Phase-change heat-exchange type secondary steam heat recovery utilization method, apparatus and use thereof

Examples

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Effect test

Embodiment 1

[0064] Example 1: Phase-change heat recovery and utilization device for secondary steam heat energy:

[0065] The phase-change heat recovery and utilization device for secondary steam heat energy is composed of a phase-change heat exchanger, a steam-water separator, a negative pressure mechanical compression heat pump or a steam injection heat pump, or a combination of them connected by pipelines (see Figure 3-Figure 6 );

[0066] 1) Phase-change heat exchangers: divided into conventional (non-heat pipe) phase-change heat exchangers and heat pipe phase-change heat exchangers

[0067] a. Schematic diagram of conventional phase change heat exchanger figure 1 As shown, it is composed of heat exchange tube box, lower water supply tank, upper steam box, secondary steam condensate and non-condensable gas exhaust pipe; its main function is to remove the vapor phase (dirty, corroded) entering the heat exchange tube box The secondary steam condenses into liquid-phase saturated water...

Embodiment 2

[0073] Example 2: Phase-change heat recovery and utilization method of secondary steam heat energy

[0074] 1) The steps of the phase-change heat recovery and utilization method of secondary steam heat energy:

[0075] a. First, inject evaporation water into the water supply tank under the phase change heat exchanger. If the saturated condensed water of the dryer, distiller or concentrator is used as the evaporation water, the water can be injected into the steam-water separator and descend through the steam-water separator. Connect the pipe to inject evaporation water into the lower header of the phase-change heat evaporator;

[0076] b. While injecting evaporation water into the phase-change heat exchanger, start the heat pump to draw negative pressure on the steam-water separator, phase-change heat evaporator, and each evaporation connecting pipe and box; the negative pressure value is set at a temperature lower than the boiling point of the evaporation water The saturatio...

Embodiment 3

[0087] Example 3: Application of phase-change heat recovery and utilization device and method for secondary steam heat energy in drying equipment

[0088] The principle of phase conversion heat recovery and utilization device for secondary steam heat energy applied to drying is as follows: Figure 7 Shown: The dotted line box in the figure is a phase-change heat recovery and utilization device for secondary steam heat energy.

[0089] The primary heating steam indirectly heats the wet material, the primary heating steam releases the heat of evaporation, conducts it to the material and condenses, and discharges it from the steam trap to the phase-change heat type secondary steam heat recovery device; the wet material absorbs the evaporation heat, and the temperature rises to When the water reaches the boiling point, it evaporates into secondary steam and the material enters the phase-change heat recovery and utilization device of secondary steam heat energy, and the wet materia...

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Abstract

The invention discloses a method and a device for phase-change heat exchange type secondary steam heat energy recovery utilization and application thereof, which aim to solve the technical problems that the prior secondary steam heat energy can or cannot be utilized, or the utilization rate of the heat energy is low, or the secondary steam heat energy can be efficiently utilized, but has low application range. A adopted technical proposal comprises: water for evaporation is injected into a water supply tank of a phase-change heat exchanger; a starting heat pump pumps a steam-water separator, the phase-change heat exchanger, and various evaporation connection pipes and tanks into negative pressure; secondary steam is continuously aerated into a heat exchange tube box of the phase-change heat exchanger; the water for evaporation is heated through heat conduction of a heat exchange tube to ensure that the water for evaporation is increased to a boiling point and absorbs a large amount of vaporization heat to be evaporated into clean steam; and the steam is pumped by a heat pump and is compressed to steam with heat supply network quality for supply or heat consumption equipment to use. The method and the device have the advantages of high utilization rate of the heat energy, and wide application range.

Description

technical field [0001] The invention belongs to the technical field of conversion and utilization of heat energy, and in particular relates to a method, device and application of heat energy recovery and utilization of secondary steam. Background technique [0002] 1. Generation of secondary steam: [0003] In industries such as metallurgy, chemical industry, food, papermaking, textile, pharmaceutical, daily chemical, seawater desalination, feed and environmental protection, steam is used for distillation, concentration, evaporation, cooking and drying in the production process, which will generate a large amount of secondary steam: [0004] 1. In the process of indirect heating and drying of wet materials with steam, the heating steam releases the heat of evaporation, which is transferred to the material to be heated and condensed; the material to be heated absorbs the heat of evaporation and the temperature rises. When the temperature of the material rises to the boiling p...

Claims

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Application Information

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IPC IPC(8): F28D7/00F26B21/00B01D1/00B01D3/00
CPCY02P70/10
Inventor 杨伟
Owner DONGFANG ELECTRIC MACHINERY
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