Safe and environment-friendly method for removing explosive oil gas of large-scale emptying oil tank

Abstract

The invention relates to a safe and environment-friendly method for removing explosive oil gas of a large-scale emptying oil tank. The method comprises the following steps of: (1) carrying out an inert gas replacement treatment on the large-scale emptying oil tank or other large-scale limited spaces which are full of the oil gas and are located within the explosive limit, so as to lower the oxygen concentration of the large-scale emptying oil tank or the other large-scale limited spaces to 10-13%; (2) enabling the inert oil gas to pass through a heat exchanger and a preheater and then to enter a catalytic reactor, introducing high-temperature gas with the oil gas concentration which is lower than 0.1% into a wall-dividing type heat exchanger after the catalytic combustion is carried out so as to transfer heat quantity to new-entered inert gas, and then continuously carrying out replacement through circularly entering the oil gas into the oil tank or the other large-scale limited spaces; and (3) directly carrying out an air replacement emission treatment until the whole oxygen concentration recovers to an air normal concentration range when the oxygen concentration is lower than 0.5%. The method has the advantages of safety, high efficiency and environment protection, and the efficiency of hypoxia catalytic combustion processing under an inerting condition reaches 99%.

Description

technical field [0001] The invention relates to a safe and environment-friendly large-scale evacuated oil tank method for removing explosive oil and gas, which can be applied to oil-gas replacement and discharge treatment in large-scale evacuated oil tanks and other large confined spaces where the oil-gas concentration is within the explosive limit. Background technique [0002] The conventional treatment for vapor-filled large emptied oil tanks and other large confined spaces is air displacement. Ventilation work is faced with tens of thousands of m 3 Combustible and explosive gases and oil and gas volatilized from the "sludge" continuously. The ventilation technology currently in use is carried out under such explosive ambient conditions. The concentration of oil and gas during the whole process is generally within the explosion limit. If it encounters various ignition energy sources such as high temperature, static electricity, and lightning, it will easily trigger an ...

AI Technical Summary

Problems solved by technology

If it encounters various ignition energy sources such as high temperature, static electricity, and lightning, it will easily trigger an explosion and cause a catastrophic explosion accident, and the direct discharge of oil and gas is not conducive to environmental protection

Therefore, this direct ventilation operation method is not only extremely prone to explosions, which can lead to disastrous consequences, but also takes a long time and has low efficiency.

[0003] Conventional oil and gas recovery methods, such as activated carbon adsorption, solvent absorption, condensation and membrane separation, are suitable for the treatment of high-concentration oil and gas, but the efficiency is not high, and the concentration of oil and gas after treatment may still be within the explosion limit and cannot be eliminated explosion hazard

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