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Method for diagnosing ultralimit of low molecular soluble organic matters in chemical water production system

A technology of dissolved organic matter and diagnostic method, which is applied in the field of water treatment, can solve the problems of low molecular weight dissolved organic matter exceeding the limit, delay in problem diagnosis, and deterioration of soda water quality, so as to avoid excessive organic matter content, ensure safe and stable operation, and avoid replacement. water effect

Pending Publication Date: 2022-06-28
CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These low-molecular-weight soluble organic substances enter the thermal system, causing the quality of soda to deteriorate, and posing a serious threat to the safe and stable operation of the unit
[0004] At present, it can be judged that the content of organic matter in boiler feed water exceeds the standard by the total organic carbon (TOC) > 200 μg / L. However, there is no effective way to determine whether the reason is that the low-molecular-weight dissolved organic matter in the chemical water production system exceeds the limit, and the type of organic matter that exceeds the limit. , rapid detection means and methods, resulting in a serious lag in problem diagnosis

Method used

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  • Method for diagnosing ultralimit of low molecular soluble organic matters in chemical water production system
  • Method for diagnosing ultralimit of low molecular soluble organic matters in chemical water production system
  • Method for diagnosing ultralimit of low molecular soluble organic matters in chemical water production system

Examples

Experimental program
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Effect test

Embodiment 1

[0053] The treatment process of a chemical water production system in a power plant: urban reclaimed water → mechanical stirring clarifier → variable pore filter → clean water tank → raw water heater → self-cleaning filter → ultrafiltration device → ultrafiltration water tank → reverse osmosis device → intermediate Water tank → positive bed → negative bed → mixed bed → demineralized water tank.

[0054] A method for diagnosing excess of low-molecular-weight dissolved organic matter in a chemical water production system, comprising the following steps:

[0055] (1) Screen out the possible low-molecular-weight soluble organic compounds in advance. The low-molecular-weight soluble organic compounds that the power plant may recycle to the chemical water production system include citric acid, tartaric acid, and acetic acid in the chemical cleaning wastewater, and the membrane elements when the ultrafiltration system is flushed. Protective liquid glycerin.

[0056] Determination of...

Embodiment 2

[0105] The chemical water production system of a power plant is: effluent from reclaimed water or reclaimed water pretreatment system → water treatment small mechanical accelerated clarifier → clarified water tank → dual media filter → security filter → ultrafiltration device → ultrafiltration effluent water tank → ultrafiltration effluent Water pump→activated carbon filter→security filter→high pressure pump→reverse osmosis device→reverse osmosis fresh water tank→first-level desalination positive bed-intermediate water tank→first-level desalination negative bed→mixed bed→desalted water tank.

[0106] When the chemical water system is operating normally, is 15.6mg / L, is 6.6mg / L, is 0.31mg / L, is 0.20mg / L, and the removal rate β of TOC by reverse osmosis system is 0.97.

[0107] When the chemical water production system operates abnormally, the COD' Mn,f 39.5mg / L, TOC' f 20.2mg / L, COD' Mn,p 7.47mg / L, TOC' p It was 4.29mg / L, and the removal rate β' of TOC by reverse osm...

Embodiment 3

[0114] The chemical water production system of a power plant is: the circulating water sewage after lime softening, clarification and filtration → activated carbon filter → security filter → ultrafiltration device → ultrafiltration effluent water tank → ultrafiltration effluent booster pump → security filter → high pressure pump → reverse osmosis device → fresh water tank → fresh water pump → countercurrent regeneration cation exchanger → countercurrent regeneration anion exchanger → mixed ion exchanger → demineralized water tank.

[0115] When the chemical water system is operating normally, is 18.4mg / L, is 5.4mg / L, is 0.37mg / L, is 0.16mg / L, and the removal rate β of TOC by reverse osmosis system is 0.97.

[0116] When the chemical water production system operates abnormally, the COD' Mn,f 30.2mg / L, TOC' f 11.3mg / L, COD' Mn,p 1.31mg / L, TOC' p is 0.63 mg / L, and the removal rate β' of TOC by reverse osmosis system is 0.94.

[0117] The method of the present inventio...

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Abstract

The invention provides a method for diagnosing ultralimit of low molecular soluble organic matters in a chemical water production system. According to a solute removal rule of a reverse osmosis membrane, a relatively stable correlation exists between chemical oxygen demand (CODMn) and total organic carbon (TOC) in water with basically same water quality conditions, and correlation values of different concentrations of the low-molecular-weight soluble organic matters, the chemical oxygen demand (CODMn) and the total organic carbon (TOC) are utilized, so that the ultra-limit diagnosis of the low-molecular-weight soluble organic matters in the chemical water production system is realized; and judging over-limit organic matters. The diagnosis method can timely find out that the low-molecular-weight soluble organic matter in the chemical water production system exceeds the limit, the organic matter content of boiler make-up water is prevented from exceeding the standard, and safe and stable operation of a unit is guaranteed. The types of the overrun low-molecular-weight soluble organic matters can be accurately judged, the range of troubleshooting is narrowed, and operations such as blind water change and equipment disassembly are avoided.

Description

technical field [0001] The invention relates to a method for diagnosing the excess of low-molecular soluble organic matter in a chemical water production system, belonging to the field of water treatment. Background technique [0002] Large-capacity and high-parameter thermal power plants have extremely strict requirements on the quality of boiler feed water. "Water and Vapor Quality of Thermal Power Generation Units and Steam Power Equipment" (GB / T 12145-2016) stipulates that for units with boiler superheated steam pressure higher than 18.3MPa, the quality of boiler make-up water should meet the requirements of silica ≤10μg / L, conductivity ≤0.15μs / cm, total organic carbon (TOC)≤200μg / L. If the total organic carbon in the boiler make-up water is higher than the specified value, it means that the make-up water carries a certain amount of organic matter into the thermal system. In the thermal system, organic matter will decompose into low-molecular-weight organic acids, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N33/18G01N15/08C02F1/44
CPCG01N33/00G01N33/1806G01N33/1846G01N15/08C02F1/441G01N2015/086
Inventor 李嘉晨牛犇孙勇徐华伟
Owner CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD