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Outer drying steam triple-effect heat exchange system

A technology of heat exchange system and drying heat exchanger, which is applied in the direction of steam superheating, steam generation, and superheat temperature control, etc., can solve the problems of high moisture content of saturated steam, decreased drainage capacity, decreased pressure difference, etc.

Inactive Publication Date: 2013-01-16
YIHENG ENERGY SAVING TECH JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of the existing water-bath saturated steam generators are: the water content in the saturated steam is high, and the steam quality is poor
After the high-temperature condensed water enters the condensed water pipe, the pressure drops continuously along the way, part of the high-temperature condensed water flashes into steam, the volume expands by more than 1000 times, and the flow rate increases by about 10 times, which is very easy to form steam resistance; after the steam resistance, the back pressure of the trap increases , the pressure difference between the two ends of the trap decreases, and the drainage capacity decreases, resulting in the condensed water generated in the heat exchanger cannot be removed in time, the efficiency of the heat exchanger decreases, and the material temperature cannot meet the process requirements, thus affecting normal production
In order to ensure production, it is often necessary to open the shut-off valve in parallel with the steam trap for direct discharge. The steam pressure leaked from the shut-off valve offsets the steam resistance; although the production is guaranteed, the steam utilization rate is reduced and the steam consumption per unit product is increased.
Therefore, the heat exchange efficiency and energy efficiency of the existing heat exchange system are relatively low.

Method used

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  • Outer drying steam triple-effect heat exchange system

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Embodiment Construction

[0017] Such as figure 1 As shown, the external drying steam three-effect heat exchange system of the present invention includes a superheated steam pipe, a water bath type saturated steam generator 6, a make-up water pump 8, a steam-water separator 9, a steam drying heat exchanger 10, and a main steam heat exchanger 11 , flash tank 12, flash steam heat exchanger 13, condensate water heat exchanger 14, water collection tank 15 and PLC controller 16a.

[0018] The lower part of the cylinder of the water-bath saturated steam generator 6 is a liquid phase space, and the upper part of the cylinder is a vapor phase space. The top wall of the vapor phase space is provided with a water-bath saturated steam generator exhaust valve 6b, and the water-bath saturated steam generator A splitter 6a is provided in the liquid phase space of 6. A water level gauge 7 and an overflow valve 6c are installed on the side wall of the water bath type saturated steam generator 6, and the overflow valv...

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Abstract

The invention relates to an outer drying steam triple-effect heat exchange system. A flow divider is arranged in the liquid phase space of a water-bath-type saturated steam generator, and a steam discharge pipeline of the flow dividier is sequentially provided with a steam water separator and a steam drying heat exchanger; overheated steam enters the flow divider through a pressure control valve; wet saturated steam from the saturated steam generator is heated into dry saturated steam by overheated steam; the dry saturated steam enters a main steam heat exchanger and becomes high-temperature condensation water after materials are heated for the third time; flash steam of the high-temperature condensation water heats the materials in the flash steam heat exchanger for the second time; condensed flash steam enters the condensation water heat exchanger; the condensation water in the high-temperature condensation water continuously releases sensible heat to heat the material for the first time; the condensation water after temperature reduction enters a water collecting tank, and is pumped into the saturated steam generator by a water supplying pump; and the aperture of the pressure control valve is regulated by a PLC (programmed logic controller) according to the material outlet temperature. The system achieves cascading utilization of steam heat energy, guarantees that the steam heat energy can be used up, and improves the energy efficiency.

Description

technical field [0001] The invention relates to a steam heat exchange system, in particular to an external drying steam three-effect heat exchange system. Background technique [0002] In indirect heat exchange, the heat exchange efficiency of saturated steam is higher than that of superheated steam, and the higher the degree of superheat, the lower the heat exchange efficiency. When there is only superheated steam source, it is necessary to reduce the temperature of the superheated steam to reduce the degree of superheat. Generally, steam desuperheaters such as spray desuperheater, surface desuperheater, etc. are used. The lower the superheat after desuperheating, the more serious the steam will be with water, and the worse the steam quality will be. If it is necessary to reduce the steam temperature to the saturation temperature corresponding to the required steam pressure, a water-bath saturated steam generator is usually used, also known as a water-bath steam desuperhea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22G5/12
Inventor 杨晓辉张基虎杨思伦张梦颖
Owner YIHENG ENERGY SAVING TECH JIANGSU
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