Method for recycling high-temperature oil-containing waste steam

Abstract

The invention discloses a method for recycling high-temperature oil-containing waste steam. The method comprises the following steps: converting the high-temperature oil-containing waste steam into condensed water, light oil and sulfur-containing non-condensable gas; conveying the condensed water and the sulfur-containing non-condensable gas to a circulating fluidized bed boiler; carrying out carbon dioxide capture on flue gas generated in the circulating fluidized bed boiler, wherein the step of conveying the condensate water and the sulfur-containing non-condensable gas to the circulating fluidized bed boiler comprises the following steps: conveying the sulfur-containing non-condensable gas to the circulating fluidized bed boiler, and carrying out desulfurization treatment; the desulfurization treatment comprises in-furnace desulfurization and wet desulfurization; in the in-furnace desulfurization process, the temperature of the circulating fluidized bed boiler is 850-900 DEG C, and the calcium-sulfur ratio is 2-2.5; in the wet desulfurization process, a lime slurry wet desulfurization agent is adopted for desulfurization. According to the method for recycling high-temperature oil-containing waste steam, it can be ensured that the oil-containing waste steam reaches the standard to be discharged, recycled condensate water, light oil and sulfur-containing non-condensable gas are effectively utilized, and sulfur in the non-condensable gas is efficiently removed.

Description

technical field [0001] The invention belongs to the technical field of waste steam treatment, and in particular relates to a method for recycling and utilizing high-temperature oily waste steam. Background technique [0002] At present, the thermal recovery method is generally adopted for the recovery of heavy oil, which is completed by using the mechanism of viscous reduction of heavy oil heating, the oil displacement mechanism of oil layer thermoelastic energy release, and the dilution and miscibility of steam on heavy oil distillation, cracking and emulsification. . By injecting a large amount of steam into the formation crude oil, the seepage capacity of the heavy oil can be improved, and the industrialized exploitation of the heavy oil can be realized. However, in the process of thermal recovery of heavy oil, the temperature and pressure of oil well produced fluid are relatively high. After the oil well production fluid is transported to the surface, it needs to be co...

AI Technical Summary

Problems solved by technology

This direct cooling process mainly has the following defects: the oily particles in the oily waste steam are easy to adhere to the heat exchange surface of the cooler, which will reduce the heat transfer effect of the cooler; the existence of non-condensable gas in the oily waste steam makes the total heat transfer The coefficient is reduced, resulting in deterioration of heat transfer; due to the impact of production, the amount of exhaust steam fluctuates greatly, and the temperature of exhaust steam cooled by direct cooling is uncontrollable, which will cause the paralysis of the rear-end desulfurization device; the tolerance of direct cooling device is poor , waste steam carrying crude oil into the device will cause system paralysis; the water cooling system is easily restricted by water source, and cannot guarantee a stable cold source supply, thus affecting the load of waste steam treatment

[0004] In addition, in the existing technology, the process of "spray + oil-water separation + closed circulating water cooling" is also used to treat oily waste steam from thermal recovery of heavy oil. Although this technology realizes the closed treatment of oily waste steam, it achieves standard discharge , but it does not effectively utilize the recovered non-condensable gas, condensed water, and light oil, and the sulfur content of the non-condensable gas is high, while the existing desulfurization process has high cost, large investment, and poor benefit

Images