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

Active Publication Date: 2013-01-02

BAOSHAN IRON & STEEL CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

After consulting the information, there is no foreign l...

Method used

Apply the present invention, reclaim STD briquette humidity control condensed water, can make full use of condensed water waste heat on the one hand, can control condensed water quality on the other hand, satisfy the water index of CDQ boiler, so this patent has relatively High practical value.

Through process improvement, the system of the present invention has been added between the coal humidity control section and the CDQ section, and...

Abstract

Disclosed are an STD type technology and a system for recovering condensate water of coal moisture control. The technology includes (1) inducing condensate water from a flash tank into a condensate storage tank, and adding treating agent involving at least one of ammonia water, sodium hydroxide, diamine and sodium phosphate to result in that the condensate water, after reaction of the condensate water and treating agent, has pH of 8-9.5, hardness of 2 Mumol/L and diamine concentration of 20-100 Mug/L; (2) filtering the condensate water after the reaction to remove precipitate generated by reaction of total iron in the condensate water and added agent; and (3) inducing the filtered condensate water into a pure water tank or an oxygen remover in coke dry quenching section for reutilization, wherein content of the total iron is smaller than 50 Mug/L, conductivity of the total iron is not larger than 20 Mus/cm, and the condensate water is introduced into the pure water tank after temperature thereof is adjusted to no larger than 60 DEG C.. The invention effectively utilizes excess heat while recovering condensate water; and simultaneously ensures that the condensate water quality satisfies water requirement of coke dry quenching and eliminates effects of steam pipe net, coal moisture control drier and condensate water pipeline on the water quality.

Application Domain

Multistage water/sewage treatmentWater/sewage treatment by neutralisation

Technology Topic

DiamineChemistry +16

Image

Examples

Experimental program(2)

Example Embodiment

[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 adjusted in temperature so that the water temperature is ≤60°C before being introduced into the pure water tank.

[0042] Among them, the point of use of condensate: deaerator;

[0043] Steam consumption: 21t/h;

[0044] Condensate flow rate: 19t/h;

[0045] Condensate temperature: 102℃;

[0046] Membrane filter device: metal stainless steel sintered wire mesh membrane.

[0047] The condensate water quality is shown in Table 1:

[0048] Table 1

[0049]

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.

PUM

Property	Measurement	Unit
Hardness	<= 2.0

Description & Claims & Application Information

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