Supercritical pressure steam pouring furnace

Abstract

A supercritical pressure steam injection boiler has a burner, a furnace, a flue, and a water supply pipe. First and second radiant tube bundles are arranged in the furnace, first and second convective tube bundles are arranged in the flue, and the water supply pipe and heat exchange The shell-side inlet of the heat exchanger is connected, the shell-side outlet of the heat exchanger is connected with the inlet of the first convection tube bank through the No. 1 pipe, the outlet of the first convection tube bank is connected with the inlet of the first radiant tube bank through the No. The outlet of the heat exchanger communicates with the tube-side inlet of the heat exchanger through No. 3 pipe, the tube-side outlet of the heat exchanger communicates with the inlet of the second radiant tube bundle through No. The inlet of the tube bundle is connected, and the outlet of the second convection tube bundle is connected with the steam discharge pipe; the invention moves the tube bundle heated by the final stage of steam from the radiation section to the convection section, avoiding the deterioration of heat transfer, and the steam pressure can reach 26MPa, solving the problem of high-pressure deep well The problem of difficulty in mining 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 as follows: figure 1 As shown: 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, and the flue 3 is the heat convection section of the boiler. Radiant tube bundles 5 are arranged in the furnace 2, convective tube bundles 6 are arranged...

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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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