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STD type technology and system for recovering condensate water of coal moisture control

A humidity control technology for condensed 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 traffic

Active Publication Date: 2013-12-25
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After consulting the information, there is no foreign literature disclosing the recycling method of condensate

Method used

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  • STD type technology and system for recovering condensate water of coal moisture control
  • STD type technology and system for recovering condensate water of coal moisture control
  • STD type technology and system for recovering condensate water of coal moisture control

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A STD type coal humidity control condensate recovery process, which comprises the following steps: 1) introducing condensate from the flash tank into a condensate storage tank, adding a treatment agent to the condensate storage tank, the treatment agent comprising ammonia, hydrogen 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 ≤2 μmol / L, and the hydrazine is 20-100 μg / L; 2) The condensed water 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 ≤20μS / cm; 3) The above-mentioned filtered condensed water is introduced into the pure The deaerator in the water tank or CDQ section is recycled; among them, the temperature of the condensed water introduced into the pure water tank needs to be adjusted to make the water t...

Embodiment 2

[0051] Condensation point of use: pure water tank;

[0052] Steam consumption: 25t / h;

[0053] Condensate flow: 23.5t / h;

[0054] Condensed water temperature: 54°C;

[0055] Membrane filter device: metal stainless steel sintered wire mesh membrane or polytetrafluoroethylene solid support membrane.

[0056] The water quality of condensate is shown in Table 2:

[0057] Table 2

[0058]

[0059] It can be seen from the above that, by adopting the process of the present invention, the condensed water is effectively recovered, and the remaining heat energy is directly used; the water quantity of the water supply pipeline incorporated into the CDQ is stable, and the temperature of the condensed water meets the requirements, and has no adverse effect on the CDQ operation and production ; The water quality of the condensed water is effectively controlled, which can meet the water requirements of CDQ boilers.

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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.

Description

technical field [0001] The invention relates to a condensed water recovery method, in particular to an STD type coal humidity control condensed water recovery process and system. Background technique [0002] Coal moisture control technology (referred to as CMC: coal moisture control) is a pretreatment technology for coking coal, that is, by drying the coking coal outside the coke oven to reduce and stabilize the moisture content of the coal in the furnace, so as to increase the output of the coke oven and stabilize the operation. effect. At present, the "SteamTube Dryer (STD) type coal humidity control process" is widely used, and the dryer is its main equipment. Inside the dryer, multi-layer steam heat exchange tubes are arranged in the circumferential direction. The coking coal enters the steam heat exchange tube of the dryer, and the low-pressure steam enters the steam heat exchange tube of the dryer. The coking coal and the low-pressure steam perform indirect heat exch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/66
Inventor 张福行刘杰程乐意曹银平王伟民李良华蓝健张菊华
Owner BAOSHAN IRON & STEEL CO LTD
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