A large-diameter slat drill type in-situ repair system

Abstract

The invention provides a large-diameter lath drill type in-situ remediation system which comprises a moving platform (1), a drill system (2) and a hot steam injection system (3), wherein the moving platform comprises a rigid bracket (11) and supports and controls the drill system to move up and down through the rigid bracket; the drill system comprises a large-diameter lath drill (21) and a hollowrod (22) extending upward along the large-diameter lath drill; the hot steam injection system comprises a pressure sensor (31), a temperature sensor (32) and a valve position transmitter (33); the pressure and temperature of the hot steam are monitored by the pressure sensor and the temperature sensor, and the pressure and flow velocity of hot steam injection are controlled by the valve positiontransmitter; the hot steam is injected through the hollow rod. According to the system provided by the invention, the technological parameters can be adjusted flexibly and conveniently according to the factors such as stratum, pollution depth, concentration distribution of pollutants and pollutant characteristics so as to realize energy-saving and efficient remediation of a complicated pollution site.

Description

technical field [0001] The invention relates to the field of environmental technology, in particular to a large-diameter slat drill type in-situ repair system. Background technique [0002] After more than 30 years of rapid industrial development, a large amount of pollutants have entered the soil and groundwater through solid waste stacking and dumping, sewage leakage, atmospheric deposition, etc., resulting in a large number of chemically polluted plots. A large number of these chemically polluted plots have been included in the scope of redevelopment and utilization along with the planning of urbanization development. The pollution depth of some chemically polluted plots is relatively deep, reaching below 15 meters below the ground, so it is no longer suitable for restoration by excavation-treatment methods. A large number of in-situ remediation technologies have been used in deep-polluted plots, such as in-situ oxidation technology, multiphase extraction technology, air...

AI Technical Summary

Problems solved by technology

[0004] At present, there are very limited cases of in-situ thermal desorption technology used in remediation projects of polluted sites, mainly because in-situ thermal remediation generally needs to set up vertical curtains on the pollution source area, and the ground needs to be hardened to prevent pollutants from being removed from the soil when the soil is heated. Ground escape causes secondary pollution. At the same time, the currently used ERH and TCH technologies need to set up a large number of heating wells, and invest a lot of electric energy or fuel consumption. Another disadvantage of TCH and ERH technologies is the comparison between adjustment and control during the restoration period. Difficulty, detection lag of repair effects

In addition, the currently used in-situ thermal desorption remediation technology requires a very high investment cost for the polluted site with deep pollution depth, and the engineering construction is also very difficult

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