Method for producing high-pressure steam by closed combustion of pure oxygen with methanol or lower alkanes

Abstract

This invention discloses a method for generating high-pressure steam through the closed combustion of pure oxygen with methanol or low-carbon alkanes. The method includes: S1, introducing pure oxygen and methanol or low-carbon alkanes as reactants into a closed combustion chamber to achieve precise mixing and efficient combustion; S2, directly injecting water into the high-temperature exhaust gas generated after combustion in the combustion chamber, causing it to rapidly evaporate and produce a high-pressure steam mixture containing saturated water vapor and carbon dioxide; S3, injecting the high-pressure steam mixture through a pipeline to the destination requiring heating. This invention utilizes the combustion reaction of pure oxygen with alcohols or low-carbon alkanes in a closed environment to achieve a highly efficient and stable combustion process, generating high-pressure combustion exhaust gas. Water is directly injected into the high-temperature exhaust gas generated after combustion in the combustion chamber, causing it to rapidly evaporate and produce a high-pressure steam mixture, which is then transported through a pipeline to a suitable commercial application site.

Description

Technical Field

[0001] This invention belongs to the field of thermal energy engineering technology, and more specifically, relates to a method for generating high-pressure steam by closed combustion of pure oxygen with methanol or low-carbon alkanes. Background Technology

[0002] With the rapid development of industrialization, high-pressure steam has been widely used in many fields such as power, petrochemicals, metallurgy, and textiles.

[0003] Currently, the supply of high-pressure steam in the market mainly relies on traditional boiler combustion methods, which suffer from low energy efficiency and serious environmental pollution. Therefore, developing a new, efficient, and environmentally friendly high-pressure steam generation technology has broad market prospects and enormous commercial value. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a method for generating mixed steam by burning pure oxygen with methanol or low-carbon alkanes in a closed, high-pressure environment. The method generates high-temperature, high-pressure exhaust gas through combustion reaction in a closed, high-pressure environment, and then injects demineralized water into the combustion exhaust gas to generate high-pressure steam.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for generating high-pressure steam by closed combustion of pure oxygen with methanol or low-carbon hydrocarbons includes the following steps:

[0007] S1 introduces pure oxygen and methanol or low-carbon alkanes as reaction raw materials into a sealed combustion chamber to achieve precise mixing and efficient combustion of pure oxygen and methanol or low-carbon alkanes.

[0008] S2, water is directly injected into the high-temperature exhaust gas produced by combustion at the rear of the combustion chamber, causing it to evaporate rapidly and produce a high-pressure steam mixture containing saturated water vapor and carbon dioxide.

[0009] S3, the high-pressure steam mixture is injected through a pipeline into the destination that needs to be heated to increase the recovery rate.

[0010] According to one embodiment of the present invention, the ratio of introduced oxygen to methanol or low-carbon alkanes is such that the oxygen content in the combustion exhaust gas is zero.

[0011] According to one embodiment of the present invention, the low-carbon alkane is C1 to C4, preferably C3 to C4. 4。

[0012] According to one embodiment of the present invention, the sealed combustion chamber is made of heat-resistant alloy material, and the combustion temperature of the combustion chamber is not lower than 1300°C.

[0013] According to one embodiment of the present invention, in step S2, pure water or demineralized water is injected into the combustion chamber.

[0014] According to one embodiment of the present invention, the purity of the pure oxygen is at least 99%.

[0015] According to one embodiment of the present invention, when the pressure of the high-pressure steam mixture generated in step S2 is 9-10 MPa, the saturation temperature is 290-310°C.

[0016] According to one embodiment of the present invention, when the pressure of the high-pressure steam mixture generated in step S2 is 10 MPa, the saturation temperature is 309.74 °C.

[0017] According to one embodiment of the present invention, the generated high-pressure steam-gas mixture is injected into the oil well through a pipeline.

[0018] The beneficial effects of this invention are:

[0019] 1) This invention uses pure oxygen and methanol or low-carbon alkanes (such as LPG / C3 / C4) as reaction raw materials to carry out combustion reaction in a closed high-pressure environment, thereby achieving a highly efficient and stable combustion process, and thus generating high-pressure combustion exhaust gas. Demineralized water or pure water is directly injected into the high-temperature exhaust gas generated by combustion behind the combustion chamber, causing it to evaporate rapidly and generate high-pressure steam mixture gas. Then, the generated high-pressure steam mixture gas is transported to a suitable commercial application site through pipeline.

[0020] 2) This invention utilizes a closed-loop combustion technology to generate high-pressure steam from pure oxygen and methanol. This combustion method is an advantageous energy conversion process, effectively converting chemical energy into thermal energy, and further into high-pressure steam thermal energy. Simultaneously, the invention employs a closed combustion chamber design and construction, equipped with advanced burners and control systems, to achieve precise mixing and efficient combustion of pure oxygen and methanol. This results in highly efficient, zero-emission, and pollution-free steam generation, providing a stable and reliable high-pressure steam source for industrial production. The raw materials are widely available, and the use of high-purity oxygen ensures the smooth progress of the reaction.

[0021] 3) This invention can be applied at the surface wellhead of an oilfield. It utilizes pure oxygen (liquid oxygen) and methanol to carry out a combustion reaction in a closed high-pressure environment. Demineralized water is injected into the high-pressure tail gas to generate high-pressure steam, which is then directly injected into the oil well. It can be widely used in oilfield thermal recovery.

[0022] 4) This invention has advantages such as high efficiency, environmental friendliness, and broad market prospects. It can not only provide a stable and reliable high-pressure steam source for industrial production, but also promote the upgrading and development of related industries, thus possessing significant strategic importance and sustainable commercial value. Furthermore, the investment scale is moderate, and the investment payback period is relatively short. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the equipment structure for generating high-pressure steam by closed combustion of pure oxygen and methanol in this invention. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are merely illustrative and explanatory of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are covered within the scope of protection intended by the present invention.

[0025] Example 1

[0026] A high-temperature and high-pressure resistant pressure vessel is used as a closed high-pressure environment. The pressure vessel design parameters are: pressure 20MPa, temperature 550℃, wall thickness is determined according to the combustion chamber diameter, and the size of the pressure vessel is determined according to the design steam volume.

[0027] A combustion chamber is installed in a sealed pressure vessel. It is made of heat-resistant alloy (nickel-based) material. The combustion temperature of the combustion chamber is not lower than 1300℃. The ratio of pure oxygen to fuel (methanol or C3 to C4) is such that the oxygen content in the combustion exhaust gas is zero.

[0028] The high-temperature, high-pressure exhaust gas generated in the combustion chamber enters the steam generation chamber, where demineralized water is simultaneously injected and mixed with the exhaust gas. The demineralized water is heated and evaporated, mixing with the exhaust gas to form a mixed saturated steam. At a pressure of 10 MPa, the saturated steam has a saturation temperature of 309.74℃. The generated mixed saturated steam can then be transported to the required application sites under its own pressure, such as for injection into oil wells or industrial heating.

[0029] It is evident that the technical solution of this invention, which utilizes the closed combustion of pure oxygen and methanol to generate high-pressure steam, possesses advantages such as high efficiency, environmental friendliness, and broad market prospects. This invention can not only provide a stable and reliable high-pressure steam source for industrial production but also promote the upgrading and development of related industries, thus possessing significant strategic importance and commercial value.

[0030] The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for producing high pressure steam by closed combustion of pure oxygen with methanol or lower hydrocarbons, characterized in that, Includes the following steps: S1 introduces pure oxygen and methanol or low-carbon alkanes as reaction raw materials into a sealed combustion chamber to achieve precise mixing and efficient combustion of pure oxygen and methanol or low-carbon alkanes. S2, water is directly injected into the high-temperature exhaust gas produced by combustion at the rear of the combustion chamber, causing it to evaporate rapidly and produce a high-pressure steam mixture containing saturated water vapor and carbon dioxide. S3, the high-pressure steam mixture is injected through a pipeline into the destination that needs to be heated to increase the recovery rate.

2. The method according to claim 1, characterized in that, The ratio of the pure oxygen introduced to methanol or low-carbon alkanes is based on the premise that the oxygen content in the combustion exhaust gas is zero.

3. The method according to claim 1, characterized in that, The low-carbon alkane is C1 to C4, preferably C3 to C4.

4. The method according to claim 1, characterized in that, The sealed combustion chamber is made of heat-resistant alloy material, and the combustion temperature of the combustion chamber is not lower than 1300℃.

5. The method according to claim 1, characterized in that, In step S2, pure water or demineralized water is injected into the combustion chamber.

6. The method according to claim 1, characterized in that, When the pressure of the high-pressure steam mixture generated in step S2 is 9-10 MPa, the saturation temperature is 290-310℃.

7. The method according to claim 5, characterized in that, When the pressure of the high-pressure steam mixture generated in step S2 is 10 MPa, the saturation temperature is 309.74 °C.

8. The method according to claim 1, characterized in that, The generated high-pressure steam-gas mixture is injected into the oil well through a pipeline.

Images