Coal gasification greywater pretreatment method

A technology of pretreatment and coal gasification, applied in degassed water/sewage treatment, multi-stage water treatment, water treatment parameter control, etc. The effect of reducing ammonia nitrogen content and preventing system scaling

Active Publication Date: 2017-05-17
山东品高钢结构工程股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of high investment, poor effect, system fouling and environmental pollution in the current gray water treatment process, the present invention provides

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of coal gasification ash water pretreatment method, comprises following 3 steps:

[0022] Step a), set up the lye tank and the lye pump, add the mixed lye composed of caustic alkali solution and soda ash to the conversion condensate in the feed tank of the stripping tower in the conversion system of the coal gasification device, and put the gas stripping tower The pH of the shift condensate waiting to be stripped in the feeding tank is adjusted to 12. The caustic soda is 30% industrial liquid caustic soda, the dosage is 0.1% of the converted condensate mass flow rate, and the soda ash dosage is 0.2% of the converted condensate mass flow rate.

[0023] Step b), the bottom liquid of the stripping tower is sent to the buffer tank between the high-pressure flash evaporation and the low-pressure flash evaporation, mixed with black water, and the mixed liquid is sent to the low-pressure flash evaporation tank for flash evaporation.

[0024] Step c), set up a real-time...

Embodiment 2

[0030] Take 10L of transformed condensate, add 10 ml of 30% liquid caustic soda, 28 g of soda ash, cool to the standard condition, measure the pH value, lift it with steam, aerate for 2 hours, record the pH value and measure the residual ammonia nitrogen value.

[0031] According to the measurement, the ammonia nitrogen content of the shifted condensate steam advance is 2300mg / l, the pH value of the shifted condensate vapor advance is 12, the ammonia nitrogen content of the bottom liquid after stripping is 55 mg / l, and the pH value of the bottom liquid after stripping is 12.

Embodiment 3

[0037] The low-pressure flash black water flow rate of a methanol plant is about 300 m 3 / h, the flow rate of gray water discharged outside is 75 m 3 / h, change the condensate flow rate to 18m 3 / h. Take 3L of low-pressure black water, add 0.72L of transformed condensate after adding alkali gas stripping, stir, and after fully reacting, add flocculant and stir. Let it stand for more than 2h, layered. Take 50ml of the supernatant, add 2ml of acid chrome blue K (ACBK), and measure Ca by spectrophotometry 2+ , Mg 2+ content.

[0038] After measurement, the ph after the reaction is 10.5, the hardness is 3.3 m mol / l, and the Ca 2+ Content 110 mg / l, Mg 2+ Content 12mg / l.

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Abstract

A coal gasification greywater pretreatment method comprises 3 steps: (1) a lye tank and a lye pump are arranged, mixed alkaline liquor comprising a caustic alkali solution and sodium carbonate is added to conversion condensate in a stripping tower feeding tank in a coal gasification device conversion system, the PH of the conversion condensate waiting for steam stripping in the stripping tower feeding tank is adjusted to 12, and caustic alkali is 30% industrial liquid alkali. (2) a bottom liquid of a stripping tower is sent into a buffer tank between a high-pressure flash evaporation tank and a low-pressure flash evaporation tank to be mixed with black water, and a mixed liquid is sent into the low-pressure flash evaporation tank for flash evaporation; (3) a real-time PH meter is arranged in front of an inlet of a low-pressure greywater pump, an acid fluid tank and an acid fluid pump are arranged, and a proper amount of hydrochloric acid is added to the low-pressure greywater tank for partial neutralization to adjust the PH to be in a range of 8.5-9.0. The content of ammonia nitrogen in greywater can be effectively reduced, the content of calcium and magnesium ions in the greywater is reduced, and system scaling is prevented. The method is simple and easy to implement, favorable for large-scale industrial production, lower in cost, capable of saving a lot of costs and suitable for popularization and use.

Description

technical field [0001] The invention belongs to the field of gray water treatment, in particular to a coal gasification gray water pretreatment method. Background technique [0002] Coal gasification wastewater is a typical industrial organic wastewater with high concentration, high pollution, toxicity and refractory degradation. Processing costs are high. With the increasingly stringent environmental protection requirements in reality, no matter in terms of economic benefits, environmental benefits, and social benefits, we are constantly pursuing new treatment processes, continuously reducing treatment costs, integrating with the latest domestic and foreign processes, and meeting national environmental protection requirements. It is a coal chemical enterprise. inevitable choice. [0003] The current process of gray water treatment at home and abroad can basically be divided into three steps: the first step is the physical and chemical treatment of the gasification section...

Claims

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Application Information

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IPC IPC(8): C02F9/10C10J3/72C02F101/16
CPCC02F1/06C02F1/20C02F1/66C02F9/00C02F2101/16C02F2209/06C02F2301/08C02F2303/22C10J3/72C10J2300/093C10J2300/169
Inventor 赵昱昊
Owner 山东品高钢结构工程股份有限公司
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