Afterburning-type supercritical-pressure gas-liquid fuel-generator combustion-chamber redundancy-cooling device

Abstract

The invention relates to an afterburning-type supercritical-pressure gas-liquid fuel-generator combustion-chamber redundancy-cooling device, which relates to oilfield oil-production equipment and comprises a precombustion-chamber shell (1), a precombustion-chamber middle lining (2) and a precombustion-chamber inside lining (3). A water-cooling sleeve (6) is formed between the precombustion-chamber shell (1) and the middle lining (2), an air-cooling sleeve (7) is formed between the precombustion-chamber middle lining (2) and the inside lining (3), the inner wall of the air-cooling sleeve is provided with a plurality of tangential air nozzles (8), and air is sprayed out from the nozzles (8) and contacted with the surface of fuel gas on the inside lining to form a continuous air film to coola precombustion chamber. Cooling water is forced to flow through the water-cooling sleeve (6) to carry out regenerative cooling for the heated air in the air-cooling sleeve and implement redundancy cooling for the high-temperature fuel gas. In the invention, the burning-loss and damage problems of the inside lining of a steam-injecting generator are solved by a method of improving an equipment structure and a cooling mode.

Description

technical field [0001] The invention relates to oil production equipment in an oil field, in particular to a redundant cooling device for a combustion chamber of a supplementary combustion type supercritical pressure steam injection generator (also known as a composite heat carrier generator). Background technique [0002] Steam injection generators have been used in Daqing, Liaohe, Shengli, Xinjiang and other major oilfields in China for many years, and have achieved certain oil-increasing effects, but their application range was mainly concentrated in shallow reservoirs and high-permeability reservoirs in the past . With the continuous progress of oil field development, the existing composite heat carrier generators in my country, such as patent 98203951.4 "composite heat carrier generator of vortex nozzle", 98203949.2 "composite heat Heat carrier generator", 02231765.1 "Gas steam generator" and 200510022594.7 "High temperature and high pressure combustion system of subcri...

AI Technical Summary

Problems solved by technology

With the continuous progress of oil field development, the existing composite heat carrier generators in my country, such as patent 98203951.4 "composite heat carrier generator of vortex nozzle", 98203949.2 "composite heat Heat carrier generator", 02231765.1 "Gas steam generator" and 200510022594.7 "High temperature and high pressure combustion system of subcritical composite heat carrier generator" can no longer meet the needs of current oilfield production. Therefore, it is necessary to develop larger flow and higher pressure Supercritical Pressure Steam Injection Generator

[0003] However, with the increase of flow rate, pressure and temperature of the steam injection generator, there have been new technical problems to be solved urgently, one of which is the burning and damage of the inner lining of the steam injection generator

[0004] In the disclosed generator design, the cooling of the combustion chamber of the steam injection generator adopts the regenerative cooling method of setting a spiral or vertical cooling water jacket in the combustion chamber shell, but when the pressure of the generator combustion chamber increases and the equipment When the flow rate is large and the continuous long-term operation, as the temperature of the composite heat carrier increases, in order to keep the water mixed with the equipment in a saturated state with a certain steam dryness, the amount of water mixed will gradually decrease, and the original lining structure can no longer meet the working environment. According to the requirements, the inner liner is often burnt and destroyed in a ring at the flame front, which seriously affects the normal use of the steam injection generator in the main oil reservoirs in the middle and deep layers.

Especially when the generator works at supercritical pressure, because the cooling medium water has a large specific heat area, its volume in this area changes greatly with the working conditions, and the equipment is prone to heat transfer deterioration, and then burns the combustion chamber Lining, damage to equipment

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