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High-efficiency energy-saving nmmo solution concentration system and method

A high-efficiency energy-saving, concentrated system technology, applied in textiles and papermaking, sustainable manufacturing/processing, rayon recycling, etc., can solve the problems that waste heat cannot be recycled, and the conditions for secondary steam utilization are harsh, so as to reduce heat energy consumption, Effect of increasing evaporation intensity and reducing cost

Active Publication Date: 2018-11-16
唐山三友集团兴达化纤有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high boiling point of the final effect solution, the conditions for the utilization of secondary steam are relatively harsh, so part of the primary fresh steam source must be supplemented, and part of the waste heat cannot be recycled in the end.

Method used

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  • High-efficiency energy-saving nmmo solution concentration system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0060]Using the four-effect countercurrent decompression evaporation concentration system of the present invention, the technical parameters are: four-effect feeding nmmo concentration 15%, four-effect heating steam temperature 56°C, four-effect evaporation temperature 42°C, four-effect vacuum -94kpa, four-effect outlet The feed concentration is 25%. The three-effect heating steam temperature is 75°C, the three-effect evaporation temperature is 66°C, the three-effect vacuum is -82kpa, and the three-effect output concentration is 45%. The second-effect heating steam temperature is 93°C, the second-effect evaporation temperature is 85°C, the second-effect vacuum is -55kpa, and the second-effect output concentration is 65%. The heating steam temperature of the first effect is 105°C, the evaporation temperature of the first effect is 100°C, the vacuum of the first effect is -20kpa, and the output concentration of the first effect is 83%.

Embodiment example 2

[0062] Using the four-effect countercurrent decompression evaporation concentration system of the present invention, the technical parameters are: four-effect feeding nmmo concentration 18%, four-effect heating steam temperature 57°C, four-effect evaporation temperature 44°C, four-effect vacuum -90kpa, four-effect outlet The feed concentration is 31%. The three-effect heating steam temperature is 78°C, the three-effect evaporation temperature is 67°C, the three-effect vacuum is -83kpa, and the three-effect output concentration is 44%. The second-effect heating steam temperature is 91°C, the second-effect evaporation temperature is 86°C, the second-effect vacuum is -57kpa, and the second-effect output concentration is 63%. The heating steam temperature of the first effect is 105°C, the evaporation temperature of the first effect is 98°C, the vacuum of the first effect is -17kpa, and the output concentration of the first effect is 82%.

Embodiment example 3

[0064] Using the four-effect countercurrent decompression evaporation concentration system of the present invention, the technical parameters are: four-effect feeding nmmo concentration 21%, four-effect heating steam temperature 55°C, four-effect evaporation temperature 40°C, four-effect vacuum -95kpa, four-effect outlet Material concentration 30%. The three-effect heating steam temperature is 79°C, the three-effect evaporation temperature is 67°C, the three-effect vacuum is -83kpa, and the three-effect output concentration is 45%. The second-effect heating steam temperature is 93°C, the second-effect evaporation temperature is 89°C, the second-effect vacuum is -55kpa, and the second-effect output concentration is 64%. The heating steam temperature of the first effect is 107°C, the evaporation temperature of the first effect is 101°C, the vacuum of the first effect is -15kpa, and the output concentration of the first effect is 80%.

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Abstract

The invention relates to a high-efficiency energy-saving nmmo solution concentration system and method. The concentration system comprises at least two stages of concentration units arranged in sequence. The each stage concentration unit comprises a separator and a heater communicated through a connecting pipe and mutually circulating materials. The separator is provided with a secondary steam outlet. A steam outlet of the last stage of the concentration unit is used for discharging excess secondary steam. A steam outlet of the separator of each one of other concentration units is communicatedwith the heater in the next stage of the concentration unit through a gas outlet pipe. The heaters are provided with solution outlets. A solution outlet of the heater of the first stage of the concentration unit discharges a concentrated high-concentration nmmo solution through a liquid outlet pipe. A solution outlet of the heater of each one of other concentration units is communicated with theseparator of the previous stage of the concentration unit through a liquid outlet pipe. Through the countercurrent decompression evaporation system and method, low-concentration low-temperature evaporation and high-concentration high-temperature evaporation are realized and the secondary steam is effectively utilized as a heating heat source.

Description

technical field [0001] The invention relates to a solution concentration system and a concentration method, in particular to a high-efficiency energy-saving nmmo solution concentration system and a concentration method, in particular to a concentration system and a concentration method of the nmmo solution in a lyocell fiber production process. Background technique [0002] In the production process of lyocell fiber, the tow washing process needs to clean the nmmo entrained in the tow with clean water. To achieve a more thorough cleaning effect, it is necessary to ensure a large amount of washing water, which results in the obtained nmmo The concentration of the solution is too low, so the solution must be evaporated and concentrated before recycling. Generally, the obtained nmmo concentration is about 15-25%, but according to production requirements, it needs to be evaporated and concentrated to 85% before reuse. [0003] Because nmmo is relatively expensive, its recovery ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F13/04
CPCD01F13/04Y02P70/62
Inventor 于捍江么志高杨爱中周殿朋杜占军王大明侯荣超王海猛吴国振李琦
Owner 唐山三友集团兴达化纤有限公司
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