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Anti-blocking agent and equipment anti-blocking method for supercritical hydrothermal treatment system of high-salt organic waste

A technology of organic waste and supercritical water, which is applied in the fields of chemical industry and environmental protection, can solve problems such as blockage, and achieve the effect of wide application range, low cost and easy realization

Active Publication Date: 2022-04-26
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is conceivable that as long as there are enough additional crystal nuclei, the less inorganic salts will be precipitated on the wall of the reactor, thus solving the problem of equipment blockage caused by the crystallization of inorganic salts

Method used

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  • Anti-blocking agent and equipment anti-blocking method for supercritical hydrothermal treatment system of high-salt organic waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 supercritical water oxidation treatment of pickled mustard wastewater

[0039] Mustard mustard wastewater: initial chemical oxygen demand (COD), 2984mg / L; salt content (mainly NaCl), 2.8%; anti-blocking agent is 50nm SiO 2 Granules, the addition amount is 0.1%; the additive is 2% starch solution; the oxidant is air, and the peroxygen ratio is selected as 2.0; the temperature of high-temperature supercritical water is 600 ° C, and the flow ratio of mustard mustard wastewater is 3:1.

[0040] Mustard mustard wastewater with 2% starch (2) and 0.1% SiO 2Particles (3) are mixed in the mixing storage tank 4 to form a uniform suspension, which is pressurized to 26 MPa by the booster pump 5, and enters the mixer 6 without any preheating along the way; in the mixer 6, the suspension is mixed with the high temperature super The critical water and air are mixed up to 390°C and enter the reactor 9; in the reactor 9, the organic matter undergoes an oxidation reaction, and...

Embodiment 2

[0041] Example 2 Supercritical water gasification treatment of pharmaceutical wastewater

[0042] Pharmaceutical wastewater: initial COD, 34987mg / L; salt content (Na 2 CO 3 、Na 2 SO 4 Mainly), 5.8%; the anti-blocking agent is 1-10 microns of Fe 2 o 3 Granules, the addition amount is 1%; the additives are 2% starch solution and 0.5% sodium dodecylsulfonate; the oxidant is oxygen, and the peroxygen ratio is selected as 2.5; the temperature of high-temperature supercritical water is 600 ° C, which is compatible with pharmaceutical The flow ratio of wastewater is 2.5:1.

[0043] Pharmaceutical wastewater with 2% starch solution and 0.5% sodium lauryl sulfate and 3% Fe 2 o 3 The particles are mixed in the mixing storage tank 4 to form a uniform suspension, which is pressurized to 28MPa by the booster pump 5, and enters the mixer 6 without any preheating along the way; in the mixer 6, the material is mixed with high-temperature supercritical water and oxygen Mixing reaches 3...

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Abstract

The invention discloses an anti-blocking agent suitable for supercritical hydrothermal treatment of high-salt organic waste and an anti-blocking method for equipment. The anti-blocking agent is non-water-soluble inorganic solid fine particles, which can replace hydrothermal equipment or / and its The wall surface of the pipeline acts as a crystal nucleus. The method is to add anti-blocking agent and additives to the organic waste to prepare it into a uniform suspension or slurry; secondly, pressurize it to the pressure required for the reaction through a high-pressure pump, and then After mixing with supercritical water and oxidant, it reaches the required temperature for the reaction and enters the reactor; in the reactor, the organic matter undergoes a degradation reaction, and at the same time, the salt crystallizes on the surface of the anti-blocking agent, and forms a particle mixture that settles to the bottom under the action of gravity , the brine slurry formed is discharged from the lower outlet, and the gas-liquid product without salt is discharged from the upper outlet. The invention makes full use of the crystallization and dissolution properties of the inorganic salts, and effectively regulates them, avoids the fouling of the inorganic salts in pipelines and reactors, and further achieves the purpose of preventing equipment blockage.

Description

technical field [0001] The invention relates to an anti-blocking agent for a supercritical hydrothermal treatment system of high-salt organic waste and an anti-blocking method for equipment, belonging to the technical fields of environmental protection and chemical industry. Background technique [0002] Environment and energy are two major challenges facing the development of human society, and they are also research hotspots in recent years. Various organic wastes will be produced in the whole chain of mining and utilization of traditional fossil energy, causing a series of environmental pollution, and its reserves are increasingly depleted. Biomass is a renewable resource, but its grade is low, and most of it has not been effectively utilized due to technical and cost reasons. [0003] The hydrothermal technology using supercritical water (T>374℃, P>22.1MPa) as the reaction medium is a kind of technology for efficient treatment of organic waste and clean energy con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F1/74C02F11/06C02F103/32C02F103/34
CPCC02F1/72C02F1/74C02F11/06C02F2103/32C02F2103/343
Inventor 陈忠陈鸿珍
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI