Supercritical pressure steam pouring furnace

Abstract

This invention relates to a supercritical pressure steam injection boiler including the burner, the hearth, the flue and the water supply pipe. The first and second radiant tube bundles are positioned inside the hearth, the first and second convection tube bundles are positioned inside the flue, the water supply pipe is connected to the shell side input of the heat exchanger, the shell side output of the heat exchanger is connected to the input of the first convection tube bundle via the first pipeline, the output of the first convection tube bundle is connected to the input of the first radiant tube bundle via the second pipeline, the third pipeline connects the output of the first radiant tube bundle and the tube side input of the heat exchanger, the forth pipeline connects the tube side output and the input of the second radiant tube bundle, the fifth pipeline connects the output of the second convection tube bundle, and the output of the second convection is connected to the steam discharge pipe. This invention moves the steam terminal heating tube bundle from the radiant section to the convection section, which avoids heat transfer deterioration, increases the steam pressure to 26MPa and solves the exploitation problem in high pressure deep block and super heavy oil block.

Description

technical field [0001] The invention relates to special equipment for thermally exploiting deep well heavy oil in the petroleum industry, in particular to a steam injection boiler. Background technique [0002] The steam injection boiler is the core equipment for heavy oil exploitation in the oil field. It injects the high-pressure steam into the oil well to heat the crude oil in the oil layer to reduce the viscosity of the heavy oil and increase the fluidity of the heavy oil, thereby improving the recovery of deep well heavy oil. Rate. [0003] The structure of the existing steam injection boiler is shown in Figure 1: it is mainly composed of a burner 1, a furnace 2, and a flue 3. The furnace 2 and the flue 3 are connected through a connecting pipe 4. The furnace 2 is the heat radiation section of the boiler. Flue 3 is the thermal convection section of the boiler. Radiant tube bundles 5 are arranged in the furnace 2, convective tube bundles 6 are arranged in the flue 3, a...

AI Technical Summary

Problems solved by technology

[0008] In the boiler with the above structure, the water vapor piping system is relatively simple, and the radiant tube bundle is a single tube bundle. The primary heating and final heating of the steam are both completed by the radiant tube bundle. The radiant tube bundle is located in the furnace and is directly baked by the burner flame. The load is high, and the flow rate of the working fluid is small, and the heat transfer will deteriorate, so that the temperature of the working fluid cannot be further increased.

Therefore, the steam pressure generated by the existing boiler can only reach the subcritical 21 MPa, and cannot reach the supercritical pressure, which cannot meet the needs of the development of heavy oil production to deeper fields. At present, many oil fields have considerable reserves of ultra-deep heavy oil. Steam at subcritical pressure cannot be injected, and this part of the reserve has not been able to be effectively developed and utilized

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