Method for accurately detecting concentration of evaporation outlet by setting sampling detection point of evaporation concentrated solvent
A technology of detection point and sampling point, which is applied in the field of NMMO solvent recovery, can solve the problems that the outlet concentration cannot be reflected in time, and the solvent concentration cannot be fully reflected, so as to achieve the effects of improving stability, ensuring precise control, and improving the quality of glue
Active Publication Date: 2019-05-21
TIANE CHEM FIBER GROUP CORP BAODING +1
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Problems solved by technology
Using multi-effect evaporation, sampling from the final effect circulation pipe is used as a reference value for the outlet concentration, but due to the continuous operation of multi-effect evaporation, the final effect sampling sometimes cannot fully reflect the solvent concentration of the original solution supplied by evaporation, and when sampling from the outlet of the concentration pump , due to concentration control, sometimes the concentration of most parts of the outlet pipe cannot reflect the final outlet concentration in time, but can only be used as a reference data combined with online instruments
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Embodiment 1
[0017] Example 1 A method for accurately detecting the concentration of the evaporation outlet by setting the sampling detection point of the evaporated concentrated solvent
[0018] By installing a sampling valve and a control valve on the return pipe of the evaporation concentration pump, the sampling valve is installed in front of the control valve after the concentration pump (as attached figure 1 Said), the control valve is a DN15 / 20 stainless steel globe valve or a ball valve.
[0019] Setting the above sampling points can reflect the solvent concentration of the evaporating and supplying stock solution, but because the evaporation system is vacuum, the position of the sampling valve will be under negative pressure during the evaporation operation, and sampling cannot be performed. Therefore, after determining the position of the sampling valve, a control valve should be added after the position of the sampling valve in the return pipe to adjust the pressure in the pipe, so t...
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The invention provides a method for accurately detecting concentration of an evaporation outlet by setting a sampling detection point of an evaporation concentrated solvent, wherein a reflux pipelineto the final effect evaporation is arranged on the outlet pipe of an evaporation concentration pump, and a sampling valve is installed on the reflux pipeline. The method provides a pipeline which is refluxed to the final effect evaporation on the outlet pipe of the evaporation concentration pump and sets a sampling point thereon such that the concentration of the sampling point can be consistent with the concentration of the actual outlet for evaporation, which is beneficial to ensure accurate control of the evaporation concentration and can be more accurately reflect the solvent concentrationof the evaporation supply stock solution, thereby improving the stability of glue preparation and the quality of the glue. The deviation between the detected solvent concentration of the sampling point provided by the method and the concentration of the actual outlet for evaporation (that is the concentration of the solvent supplied to the stock solution) is within 0.1%.
Description
Technical field [0001] The invention relates to a method for accurately detecting the concentration of an evaporation outlet by setting a sampling detection point of an evaporated concentrated solvent, and belongs to the technical field of NMMO solvent recovery. Background technique [0002] In the solvent recovery cycle process, the evaporation system finally supplies the concentrated solvent in the qualified concentration range to the original solution to make glue, and the fluctuation of the concentration affects the quality of downstream glue making. Using multi-effect evaporation, sampling from the last-effect circulation tube is used as a reference value for the outlet concentration. However, due to the continuous operation of multi-effect evaporation, the last-effect sampling sometimes cannot fully reflect the solvent concentration of the evaporation supply stock solution, and when sampling from the outlet of the concentration pump Due to concentration control, sometimes t...
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IPC IPC(8): G01N1/20
Inventor 赵志德魏广信杜树新王文忠曹刚蒋志君
Owner TIANE CHEM FIBER GROUP CORP BAODING