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Process for heating and concentrating desalinated seawater by waste gas from boiler

A technology for concentrated seawater and waste flue gas, applied in seawater treatment, water/sewage treatment, general water supply saving, etc., can solve the problems of huge heat exchange, small heat transfer coefficient of heat exchanger, and inability to directly achieve concentrated seawater concentration, etc. To achieve the effect of less equipment investment and good heat exchange effect

Inactive Publication Date: 2012-05-16
CHINA LIGHT IND INT ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Known methods for utilizing waste heat of boiler exhaust gas include the method of directly drying solid matter by waste heat of waste flue gas and the method of indirect heat exchange and preheating solution, but the method of directly drying solid matter by waste heat of waste flue gas cannot be used for liquid; The heat exchange and preheating solution method has the problems of small heat transfer coefficient of the heat exchanger, large heat exchange and high investment, and cannot directly achieve the concentration of concentrated seawater. Therefore, the above two methods cannot be directly and economically used for the heating and concentration of concentrated seawater after freshwater.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: take 5000m 3 / h, temperature is 25°C, 7°Bé thick seawater (7°Bé thick seawater contains NaCl 54.8g / l, MgSO 4 4.74g / l, MgCl 2 6.53g / l, CaSO 4 2.75g / l, KCl 1.66g / l, NaBr 0.28g / l) and boiler exhaust gas (such as flue gas: T = 89 ℃ or more, P = 3.5kPa, Q = 4 × 2469t / h, component N 2 74.51%, O 2 12.31%, CO 2 7.615%, H 2 O 4.717%, AR 0.8493%, SO 2 0.0003%) direct heat exchange to heat up and evaporate the concentrated seawater, and the evaporation temperature is 40°C. When the cooling tower is in operation, the negative pressure is about 0.003-0.1 meters of water column, and the residence time of the material is about 5-10 seconds. Concentrated seawater is evaporated and concentrated to obtain more concentrated seawater 4933m 3 / h(7.09°Bé concentrated seawater containing NaCl 55.54g / l, MgSO 4 4.80g / l, MgCl 2 5.69g / l, CaSO 4 2.79 g / l, KCl 1.68 g / l, NaBr 0.284 g / l).

Embodiment 2

[0014] Embodiment 2: take 5000m 3 / h, temperature is 25°C, 7°Bé thick seawater (7°Bé thick seawater contains NaCl 54.8g / l, MgSO 4 4.74g / l, MgCl 2 6.53g / l, CaSO 4 2.75g / l, KCl 1.66g / l, NaBr 0.28g / l) and boiler exhaust gas (such as flue gas: T = above 128°C, P = 3.5kPa, Q = 4×2469t / h, component N 2 74.51%, O 2 12.31%, CO 2 7.615%, H 2 O 4.717%, AR 0.8493%, SO 2 0.0003%) direct heat exchange to heat up and evaporate the concentrated seawater. The evaporation temperature is 40°C. The negative pressure of the cooling tower is about 0.003-0.1 meters of water column during operation, and the residence time of the material is about 5-10 seconds. Concentrated seawater is evaporated and concentrated to obtain more concentrated seawater 4866m 3 / h(7.19°Bé concentrated seawater contains NaCl 56.31g / l, MgSO 4 4.87g / l, MgCl 2 6.71g / l, CaSO 4 2.83 g / l, KCl 1.71 g / l, NaBr 0.29 g / l).

Embodiment 3

[0015] Embodiment 3: take 5000m 3 / h, temperature is 25°C, 7°Bé thick seawater (7°Bé thick seawater contains NaCl 54.8g / l, MgSO 4 4.74g / l, MgCl 2 6.53g / l, CaSO 4 2.75g / l, KCl 1.66g / l, NaBr 0.28g / l) and boiler exhaust gas (such as flue gas: T = 206 ℃ or more, P = 3.5kPa, Q = 4 × 2469t / h, component N 2 74.51%, O 2 12.31%, CO 2 7.615%, H 2 O 4.717%, AR 0.8493%, SO 2 0.0003%) direct heat exchange to heat up and evaporate the concentrated seawater, and the evaporation temperature is 40°C. When the cooling tower is in operation, the negative pressure is about 0.003-0.1 meters of water column, and the residence time of the material is about 5-10 seconds. Concentrated seawater is evaporated and concentrated to obtain more concentrated seawater 4732m 3 / h(7.40°Bé concentrated seawater contains NaCl 57.9g / l, MgSO 4 5.01g / l, MgCl 2 6.90g / l, CaSO 4 2.91 g / l, KCl 1.75 g / l, NaBr 0.30 g / l).

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Abstract

The invention provides a process for heating and concentrating desalinated seawater by a waste gas from a boiler. The process employs the waste gas from the boiler to be used as a heat source, wherein the waste gas directly exchanges heat with desalinated seawater discharged after seawater is desalted in a natural induced draft cooling tower so as to heat and evaporate the desalinated seawater to obtain desalinated seawater with a high temperature and a high concentration; the desalinated seawater at the normal temperature is sent into the tower through a potential difference or power; the waste gas from the boiler enters the tower through the power delivery. The advantage of the invention is that in comparison with the known methods, the heat exchange rate in the heat exchange and evaporation technological process of the invention is largely raised and close to 100%. The process has characteristics of low equipment investment, good heat exchange effect, energy saving and emission reduction, waste heat utilization and so on.

Description

technical field [0001] The invention relates to a process for heating concentrated concentrated seawater by using boiler waste flue gas, and belongs to the technical field of thermal engineering. Background technique [0002] Known methods for utilizing waste heat of boiler exhaust gas include the method of directly drying solid matter by waste heat of waste flue gas and the method of indirect heat exchange and preheating solution, but the method of directly drying solid matter by waste heat of waste flue gas cannot be used for liquid; The heat exchange and preheating solution method has the problems of small heat transfer coefficient of the heat exchanger, large heat exchange and high investment, and cannot directly achieve the concentration of concentrated seawater. Therefore, the above two methods cannot be directly and economically used for the heating and concentration of concentrated seawater after freshwater. . Contents of the invention [0003] The object of the p...

Claims

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Application Information

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IPC IPC(8): C02F1/16C02F103/08
CPCY02A20/124
Inventor 彭赛军彭志成马秀起韦相亮
Owner CHINA LIGHT IND INT ENG CO LTD
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