A Large Diameter Cylindrical Drill Type In-Situ Repair System

Abstract

The invention provides a large-caliber cylinder drill bit type in-situ restoration system. The in-situ restoration system comprises a movable platform (1), a drill bit system (2) and a hot steam injection system (3), wherein the movable platform (1) comprises a rigid bracket (11), and the rigid bracket is used for supporting and controlling the drill bit system to move up and down; the drill bit system comprises a large-caliber cylinder drill bit (21) and a hollow rod (22) which extends upwards along the large-caliber cylinder drill bit; and the hot steam injection system comprises a pressuresensor (31), a temperature sensor (32) and a valve position transmitter (33). The pressure and temperature of hot steam are monitored by virtue of the pressure sensor and the temperature sensor, the injection pressure and flow speed of the hot steam are controlled by virtue of the valve position transmitter, and the hot steam is injected through the hollow rod. According to the in-situ restorationsystem, each process parameter can be flexibly and conveniently adjusted according to stratums, pollution distribution, pollutant concentration distribution, pollutant properties and the like, and complex polluted sites can be efficiently restored in an energy-saving manner.

Description

technical field [0001] The invention relates to the field of environmental technology, in particular to a large-diameter cylinder 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,...

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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