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A system and method for pretreatment of crushed coal pressurized gasification wastewater

A pressurized gasification and pretreatment technology of crushed coal, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of ineffective removal of emulsified oil, and promote Effects of demulsification, less dosage of medicament, and cost saving of medicament

Inactive Publication Date: 2017-01-18
BEIJING SOUND ENVIRONMENTAL ENG +1
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the conventional single demulsification technology cannot effectively remove the high-concentration emulsified oil in the pressurized gasification wastewater of crushed coal, and proposes a method of using two-stage dosing of ferrous sulfate and performing Fenton reaction to remove the emulsified oil at the same time. Pretreatment system and method for pressurized gasification wastewater of crushed coal with oil and refractory organic matter

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  • A system and method for pretreatment of crushed coal pressurized gasification wastewater

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Embodiment 1

[0053] A certain coal gasification wastewater is treated with a crushed coal pressurized gasification wastewater pre-treatment system, with a treatment capacity of 30L / h and a temperature of 20°C. The demulsification reaction is stirred by paddle machinery at a speed of 100 rpm, and the hydraulic retention time is 20min; the agent added to the primary flocculation reaction device is anionic PAM, the dosage of PAM is 4mg / L, the paddle mechanical stirring is adopted, the rotation speed is 20 rpm, and the hydraulic retention time is 20min; the primary mud-water separation device adopts Precipitation device; Fenton reaction adopts paddle-type mechanical stirring, the speed is 100 rpm, the hydraulic retention time is 30min, and the pH is 4; the secondary flocculation reaction device adopts paddle-type mechanical stirring, the rotational speed is 20 rpm, and the hydraulic retention time 20min; the secondary mud-water separation device adopts a sedimentation device; Fenton's pre-acid ...

Embodiment 2

[0055] A certain coal gasification wastewater is treated with the pretreatment system of crushed coal pressurized gasification wastewater, the treatment capacity is 30L / h, the temperature is 20°C, the demulsification reaction adopts paddle mechanical stirring, the speed is 100 rpm, and the hydraulic retention time is 30min; the agent added to the primary flocculation reaction device is anionic PAM, the dosage of PAM is 5mg / L, the paddle mechanical stirring is adopted, the rotation speed is 20 rpm, and the hydraulic retention time is 15min; the primary mud-water separation device adopts Precipitation device; Fenton reaction adopts paddle-type mechanical stirring, the speed is 100 rpm, the hydraulic retention time is 40min, and the pH is 3; the secondary flocculation reaction device adopts paddle-type mechanical stirring, the rotational speed is 20 rpm, and the hydraulic retention time It takes 15 minutes; the secondary mud-water separation device adopts a sedimentation device; F...

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Abstract

The invention discloses a pre-processing system and method of crushed coal pressure gasification waste water, and belongs to the field of waste water processing. The system comprises a demulsification reaction device, a first level flocculation reaction device, a first level mud and water separation device, a pipeline mixer, a fenton reaction device, a second level flocculation reaction device and a second level mud and water separation device, wherein the demulsification reaction device is connected with the first level flocculation reaction device, the first level mud and water separation device, the pipeline mixer, the fenton reaction device, the second level flocculation reaction device and the second level mud and water separation device in sequence. The demulsification reaction device is provided with a water inlet pipe used for introducing the crushed coal pressure gasification waster water; the second mud and water separation device is provided with a water outlet pipe used for discharging the processed yielding water; the demulsification reaction device is provided with a first ferrous sulfate dosing pipe; the fenton reaction device is provided with a second ferrous sulfate dosing pipe.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a pretreatment system and method for pressurized gasification wastewater of crushed coal. Background technique [0002] my country's energy structure is rich in coal and lacking in oil and gas. It has become a widely concerned issue to develop coal chemical industry by taking advantage of my country's relatively abundant coal resources. The development of coal chemical industry is inseparable from the preparation of synthesis gas, and coal gasification is a necessary means for the preparation of synthesis gas. The crushed coal pressurized gasification process represented by the Lurgi furnace is widely used in coal gasification, especially coal-based gasification, due to its mature technology, investment and operating costs compared with pulverized coal gasifiers and coal-water slurry gasifiers. natural gas. However, the waste water produced by pressurized gasification of cru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 邢林林聂邦刘金泉姜安平王凯
Owner BEIJING SOUND ENVIRONMENTAL ENG
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