STD type technology and system for recovering condensate water of coal moisture control
A humidity control technology for condensate water and coal, applied in water/sewage multi-stage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc., to meet water quality requirements, inhibit pipeline corrosion, ensure pressure and The effect of flow
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[0040] Example 1
[0041] An STD type coal humidity control condensate recovery process, which includes the following steps: 1) The condensed water from the flash tank is introduced into a condensate storage tank, and a treatment agent is added to the condensate storage tank. The treatment agent includes ammonia, hydroxide One or more of sodium, hydrazine or sodium phosphate, the pH of the condensed water after reacting with the treatment agent is 8~9.5, the hardness is ≤2μmol / L, and the hydrazine is 20~100μg / L; 2) the condensation after the above reaction Water filtration to remove the total iron in the condensed water and the precipitate produced by the dosing reaction. The total iron content is less than 50μg / L, and the conductivity is less than 20μS / cm; 3) The filtered condensate is introduced into the pure coke dry quenching section. The deaerator in the water tank or CDQ section is recycled; among them, the condensed water introduced into the pure water tank needs to be adj...
Example Embodiment
[0050] Example 2
[0051] Condensation point of use: pure water tank;
[0052] Steam consumption: 25t / h;
[0053] Condensate flow: 23.5t / h;
[0054] Condensate temperature: 54℃;
[0055] Membrane filter device: metal stainless steel sintered wire mesh membrane or polytetrafluoroethylene solid support membrane.
[0056] The condensate water quality is shown in Table 2:
[0057] Table 2
[0058]
[0059] It can be seen from the above that with the process of the present invention, the condensed water is effectively recovered, and the remaining heat energy is directly used; the water volume of the water supply pipeline incorporated into the CDQ is stable, and the temperature of the condensed water meets the requirements, and there is no adverse effect on the CDQ operation and production. ; Condensate water quality is effectively controlled, which can meet the water requirements of CDQ boilers.
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