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Membrane separating process for purifying high temperature condensated water

A high-temperature condensed water and membrane separation technology, applied in permeation/dialysis water/sewage treatment, etc., can solve the problems of oil particles clogging pores, small absorption capacity, unstable effect, etc., to achieve high recycling rate, good effluent quality, Good effluent quality

Inactive Publication Date: 2007-12-19
NANJING JIUSI HIGH TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for purifying high-temperature condensed water by using membrane separation technology in combination with the water quality characteristics of high-temperature condensed water, so as to solve the problem of unstable effect of conventional adsorption treatment methods, small absorption capacity, and easy clogging of pores by oil particles. The problem of frequent replacement of adsorption materials and online water quality monitoring system provides a stable and effective way for related enterprises to treat and reuse high-temperature condensed water

Method used

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  • Membrane separating process for purifying high temperature condensated water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 (flow process is as Figure 1)

[0025] Pass 50L steam condensate A at 85°C into the membrane treatment system. The water quality of the steam condensate is shown in the "influent water quality" column of Table 1.

[0026] As shown in Figure 1, the microfiltration or ultrafiltration membrane module 3 adopts a 19-channel tubular ceramic microfiltration membrane with a pore size of 200 nm and a membrane area of ​​1 m 2 , the pressure conditions required for filtration are provided by the pump 2, the working pressure is 0.25MPa, and the cross-flow filtration method is adopted, that is, the non-permeate circulates between the microfiltration membrane module 3 and the liquid storage tank 1, and the cross-flow membrane surface flow velocity 2.5m / s, under this condition, the stable flux of the ceramic microfiltration membrane is 0.8m 3 / h, the effluent water quality is shown in the column "Pretreatment effluent water quality" in Table 1.

[0027] The effluent fro...

Embodiment 2

[0032] Pass 50L of steam condensate A at 65°C into the membrane treatment system. The water quality of the steam condensate is shown in the "influent water quality" column of Table 2.

[0033] As shown in Figure 2, the microfiltration or ultrafiltration membrane module 3 adopts a polyethersulfone hollow fiber ultrafiltration membrane with a membrane pore size of 20 nm and a membrane area of ​​8 m 2 , the working pressure is 0.03MPa, the ultrafiltration membrane module 3 is placed in the high-temperature condensed water feed liquid of the liquid storage tank 1, and the dead-end suction negative pressure filtration method is adopted, and the suction pump 2 provides the pressure conditions required for filtration. The average flux of the lower ultrafiltration membrane is 1.2m 3 / h, the effluent water quality is shown in the column "Pretreatment effluent water quality" in Table 2.

[0034] The above-mentioned ultrafiltration membrane effluent enters the intermediate liquid tank 4...

Embodiment 3

[0037] Embodiment 3 (flow process is as Figure 3)

[0038] Pass 50L steam condensate A at 75°C into the membrane treatment system. The water quality of the steam condensate is shown in the "influent water quality" column of Table 3.

[0039] As shown in Figure 3, the microfiltration module 3 adopts a stainless steel tubular microfiltration membrane with a pore size of 0.8 μm and a membrane area of ​​0.5 m 2 , the working pressure is 0.12MPa, the dead-end filtration method is adopted, and the pressure condition required for filtration is provided by the pump 2. Under this condition, the average flux of the microfiltration membrane is 1.2m 3 / h, the effluent quality is shown in Table 3 "Pretreatment effluent quality".

[0040] The effluent from the microfiltration membrane enters the intermediate liquid tank 4, and is pressurized by the pump 5 to feed the polyethersulfone roll-type nanofiltration membrane module 6, during which a cross-flow filtration cycle is formed. Membrane...

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Abstract

The present invention relates to membrane separating process of purifying high temperature condensated water. High temperature condensated water is first microfiltered or ultrafiltered and then deeply treated with nanofiltering film to have the suspended matter, oil, colloid, dissolved small molecular weight organic matter, inorganic ion and other impurities. The process has stable treating effect and capacity of recovering the heat energy in high temperature condensated water, and the treated water may be reused in boiler. The present invention provides one stable and effective way for treating and reusing high temperature condensated water.

Description

technical field [0001] The invention relates to a method for treating high-temperature condensed water by utilizing membrane separation and purification technology, and belongs to the field of water treatment and energy saving. Background technique [0002] At present, superheated steam is widely used as thermal power and heat source in chemical industry, thermal power and other industries. After power consumption and heat exchange, superheated steam turns into condensed water. Its temperature is between 50°C and 95°C. If it is not polluted, the steam will condense The water is close to pure distilled water. However, due to pipeline corrosion, material leakage, poor management and other reasons, the steam condensate of most enterprises contains a small amount of pollutants such as oil, solid impurities, colloids, soluble small molecular organic matter and inorganic ions, so it cannot be directly recycled into the boiler. As a result, most of the high-temperature condensate ...

Claims

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Application Information

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IPC IPC(8): C02F1/44
Inventor 邢卫红徐南平
Owner NANJING JIUSI HIGH TECH
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