Efficient thermal desorption treatment system and method for restoring mercury contamination

Abstract

The invention relates to an efficient thermal desorption treatment system and method for restoring mercury contamination. The efficient thermal desorption treatment system comprises a pelletizing pretreatment unit, a feeding unit, a thermal desorption unit, a dust collecting unit, a cooling condensing unit, an exhaust gas washing unit, a gas-liquid separation unit, a water treatment unit, an exhaust gas absorption treatment and emission unit and a cooling discharging unit, wherein the pelletizing pretreatment unit is connected with the feeding unit, the feeding unit, the cooling discharging unit and the dust collecting unit are all connected with the thermal desorption unit, the dust collecting unit is separately connected with the cooling condensing unit and the pelletizing pretreatment unit, the cooling condensing unit is connected with the exhaust gas washing unit, the exhaust gas washing unit is connected with the gas-liquid separation unit, the gas-liquid separation unit is connected with the exhaust gas absorption treatment and emission unit, the cooling condensing unit, the exhaust gas washing unit and the gas-liquid separation unit are separately connected with the water treatment unit, and at the same time, the water treatment unit is connected with the cooling discharging unit. The efficient thermal desorption treatment system has the characteristics of high thermal efficiency, high contaminant removing rate, low exhaust gas dust content and low energy consumption.

Description

technical field [0001] The invention belongs to the technical field of soil remediation in the technical field of environmental engineering, and specifically relates to an efficient thermal desorption repair mercury-containing pollution treatment system and method, which are applicable to the restoration of mercury-contaminated soil and waste. Background technique [0002] The soil environment in our country is not optimistic. Some areas have serious soil pollution, and the soil environment problems in industrial and mining wasteland are more prominent. According to preliminary statistics, my country is the largest producer and consumer of mercury. Mercury discharged from coal burning, mercury ore smelting, non-ferrous metal smelting, and mercury electrolysis in the chlor-alkali industry has polluted the surrounding soil and groundwater, causing serious environmental pollution. Hidden dangers urgently need to be repaired and managed. [0003] Thermal desorption technology is...

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Problems solved by technology

There are related reports on the thermal desorption technology for mercury-containing and compound-contaminated soil, such as CN204052358U patent applied by Kang Zhaoyu and others, which uses a heating reactor to repair mercury-contaminated soil; CN104289513A patent applied by Hu Qing and others uses modular thermal desorption Treatment device and method; CN105057337A patent applied by Shen Xiaojiang and others, using high-efficiency indirect thermal desorption devices; these devices have problems such as large tail gas generation and low heat transfer efficiency