A treatment method for coal gasification ash water reuse

A treatment method and a coal gasification technology, applied in the field of water treatment, can solve the problems of increasing the discharge of wastewater from enterprises, failing to meet energy conservation and emission reduction, and being unfavorable for environmental protection, and achieve the effects of good softening effect, low treatment cost and convenient operation.

Active Publication Date: 2011-12-21
SHANGHAI HUAYI ENERGY CHEM
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Problems solved by technology

[0002] At present, for coal gasification technology, the gray water system mainly has the following problems to be solved: 1. Scaling of the gray water system; 2. Pollution of external drainage; 3. Waste of water resources
In order to ensure stable water quality, an effective method is

Method used

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  • A treatment method for coal gasification ash water reuse
  • A treatment method for coal gasification ash water reuse
  • A treatment method for coal gasification ash water reuse

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] First, at room temperature (20-25°C), add quicklime powder for industrial use into a lime milk pool filled with gray water, stir well, and prepare a lime emulsion with a concentration of 5% by mass, and let it stand for a long enough time Afterwards, the upper layer saturated clarified lime water solution overflows to the clarified lime water pool, and the saturated clarified lime water is pumped to the pool 1 to carry out softening reaction; in the soda ash solution pool, industrial soda ash is mixed with a concentration of 5% Na in the soda ash solution pool. 2 CO 3 The solution is pumped to pool 2 for softening reaction, and overflows to pool 3 for full sedimentation and filtration. The ash water temperature in each ash water pool is 55-70°C, which is close to the water temperature of the ash water tank of the Texaco gasification process. The overflowed gray water can be reused as circulating water, and the bottom flow of each gray water pool is pumped to the storag...

Embodiment 2

[0039]The softening effect measurement method and gray water are the same as in Example 1.

[0040] The quicklime is formulated into a lime emulsion with a mass percentage concentration of 15% at a temperature close to the boiling point of water, which is beneficial to the digestion of quicklime and the improvement of softening effect; the lime emulsion is directly pumped to the gray water pool 1 for softening reaction; in the soda ash solution pool The industrial soda ash is formulated into Na with a concentration of 10% by mass percentage 2 CO 3 The solution is pumped to the gray water pool 2 for softening reaction, and overflows to the gray water pool 3 for full sedimentation and filtration. The ash water temperature in each ash water pool is 55-70°C, which is close to the water temperature of the ash water tank of the Texaco gasification process. The overflowed gray water can be reused as circulating water, and the bottom flow in each gray water pool is sent to the stora...

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Abstract

The invention provides a treatment method for recycling gasification ash water. A treatment process is performed in a sedimentation tank; and the sedimentation tank comprises a first water tank, a second water tank and a third water tank which are connected with one another in sequence. The method comprises the following steps: (1) mixing the ash water and lime water at an inlet of the first water tank, entering the first water tank to perform softening reaction, standing and settling, and overflowing supernatant to the second water tank, wherein the weight of the lime water is 2.5-5 percent of the weight of the ash water; and (2) introducing pure aqueous alkali with mass percentage concentration of 5-10 percent into the second water tank, mixing the pure aqueous alkali and the supernatant which is obtained in the step 1 and reacting, standing and settling, and overflowing the supernatant to the third water tank for further sedimentation, wherein the obtained supernatant is recycled as industrial circulating water, and the weight of the pure aqueous alkali is 1-2 percent of the weight of the ash water. The treatment method is convenient to operate and has a good softening effect; and the scaling tendency of a heat exchanger and the like is greatly reduced through the ash water which is subjected to the softening treatment.

Description

technical field [0001] The invention relates to a treatment method for ash water reuse in a coal gasification process, in particular to a treatment method for ash water reuse in a Texaco gasification process, and belongs to the technical field of water treatment. Background technique [0002] At present, for coal gasification technology, there are mainly the following problems that need to be solved in the gray water system: 1. Scaling of the gray water system; 2. Pollution of external drainage; 3. Waste of water resources. Following the national environmental protection and water-saving requirements, some manufacturers have adopted measures to reuse naturally clarified gray water. Although adding a certain proportion of scale inhibitors to temporarily relieve gray water scaling at severe scaling points, there are still problems. Severe scaling tendency. Severe scaling of the gray water system will affect the continuous operation of the device, shorten the operating cycle, a...

Claims

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Application Information

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IPC IPC(8): C02F5/08
Inventor 周亚明王志光汪文梅梁铁
Owner SHANGHAI HUAYI ENERGY CHEM
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