High-pressure steam and multi-element gas generator

Abstract

The invention provides a high-pressure steam and multi-element gas generator, and relates to the technical field of gas generators. The generator comprises a burner, a high-pressure combustion chamber, a steam generation system and a multi-element gas generation system. The high-pressure combustion chamber is of a cylindrical structure formed by a double-end coil pipe, one end is connected with the natural gas burner, and the other end is connected with a pipe network. The double-end coil pipe comprises a coil pipe A and a coil pipe B, small water spraying holes are formed in the coil pipe B, and high-pressure multi-element gas is formed at the outlet end of the high-pressure combustion chamber after being sprayed through the water spraying holes. High-pressure steam and multi-component mixed gas are generated by introducing high-pressure water into the coil pipe, so that high-temperature combustion products are cooled, and the requirements of users on the using pressure and temperature of the multi-component gas are met.

Description

Technical Field

[0001] The present invention relates to the technical field of gas generators, and particularly to a high-pressure steam and multi-component gas generator. Background Art

[0002] With the development of the petroleum industry, the technology of thermal recovery of heavy oil has gradually become one of the important means to increase crude oil production. During the thermal recovery of heavy oil, it is necessary to inject a high-temperature and high-pressure multi-component mixed gas (such as nitrogen, carbon dioxide, etc.) into the oil reservoir to reduce the viscosity of crude oil and improve its fluidity. However, traditional gas generators have problems such as low efficiency, high energy consumption, and poor safety, and it is difficult to meet the requirements of modern oilfield development. Therefore, it is necessary to develop a new type of high-pressure steam and multi-component gas generator to solve the above problems. Summary of the Invention

[0003] In order to solve the above technical problems existing in the prior art, an embodiment of the present invention provides a high-pressure steam and multi-component gas generator. The technical solution is as follows:

[0004] A high-pressure steam and multi-component gas generator includes: a burner, a high-pressure combustion chamber, a steam generation system, and a multi-component gas generation system;

[0005] The high-pressure combustion chamber is a cylindrical structure formed by double-headed coiled pipes. One end of the high-pressure combustion chamber is connected to a high-pressure combustion chamber inlet flange through a high-pressure combustion chamber inlet throat pipe, and the other end of the high-pressure combustion chamber is connected to a high-pressure combustion chamber outlet flange through a high-pressure combustion chamber outlet throat pipe;

[0006] The high-pressure combustion chamber inlet flange is connected to the burner outlet flange. The inlet end of the burner is a combustion-supporting air inlet flange, and the side of the burner is a burner fuel inlet pipe;

[0007] The cylindrical structure formed by the double-headed coiled pipes is the pressure-bearing shell of the high-pressure combustion chamber. The double-headed coiled pipes include coiled pipe A and coiled pipe B. Coiled pipe A is the steam generation system, and coiled pipe B and the part of the high-pressure combustion chamber near the outlet constitute the multi-component gas generation system.

[0008] The high-pressure combustion chamber is divided into two parts along the length direction. The part near the burner is the combustion section, and the part near the outlet is the multi-component gas generation section. The combustion section accounts for 1 / 4 to 3 / 4 of the length of the high-pressure combustion chamber.

[0009] Coiled pipe A and coiled pipe B are spiral-shaped with a pipe pitch equal to the pipe diameter. The two are spirally cross-stacked and integrally welded together; the outer diameters of coiled pipe A and coiled pipe B are the same, both being 25 to 100 mm;

[0010] Coiled pipe B is provided with water spraying holes on the inner side of the pipe wall in the multi-component gas generation section of the high-pressure combustion chamber, and the water spraying holes are evenly distributed along the pipe circumference.

[0011] There are 4 - 16 water spray holes arranged in each circumference, and the aperture of the water spray holes is 1.5 - 10 mm.

[0012] High-pressure water is introduced into the coil A from the inlet end to form high-pressure steam at the outlet end. High-pressure water is introduced into the coil B, and after being sprayed through the water spray holes, high-pressure multi-component gas is formed at the outlet end of the high-pressure combustion chamber.

[0013] The inner diameter of the high-pressure combustion chamber is 50 - 800 mm, the length is 300 - 3000 mm, and the material is heat-resistant stainless steel.

[0014] The water spraying pressure of the high-pressure water in the coil B is 5 - 30 MPa, and the water spraying pressure of the coil B is greater than the pressure in the high-pressure combustion chamber.

[0015] The pressure in the high-pressure combustion chamber is 5 - 30 MPa.

[0016] The double-headed coil can also be a multi-headed coil. The multi-headed coils are spirally and crossly stacked and welded together as a whole. The pitch of each coil = the number of heads × the pipe diameter.

[0017] The fuel inlet pipe of the burner extends to the lower end of the inlet throat of the high-pressure combustion chamber.

[0018] The function of the above generator is to generate high-pressure steam and multi-component mixed gas. The multi-component gas is a mixed gas of natural gas combustion products and steam generated by water spraying.

[0019] The application process of the generator includes the following steps:

[0020] S1. The steam generation system generates high-pressure steam:

[0021] High-pressure water is introduced into the coil A from the inlet (the inlet is near the inlet throat of the high-pressure combustion chamber), exchanges heat with the high-temperature fluid on the coil wall surface and in the combustion chamber to generate high-pressure steam, and flows out from the outlet of the coil A for power generation, heating or other uses;

[0022] S2. The multi-component gas generation system generates high-pressure multi-component gas:

[0023] High-pressure water enters the coil B through the inlet of the coil B (the inlet is near the inlet throat of the high-pressure combustion chamber), is sprayed through the water spray holes to generate steam in the high-pressure combustion chamber, and after the steam and combustion products are mixed, high-pressure multi-component gas is formed at the outlet of the high-pressure combustion chamber.

[0024] When there are restrictions on the partial pressure of water vapor in the multi-component gas, the requirements are met by adjusting the amount of water entering the coil B.

[0025] The beneficial effects brought by the technical solution provided by the embodiments of the present invention at least include:

[0026] In the above solution, by introducing high-pressure water into the coil pipes of the high-pressure combustion chamber, high-pressure steam can be generated at the corresponding coil pipe outlets according to actual requirements. By adjusting the total water volume of the coil pipes and the distribution of the water volume among different coil pipes, the temperature and moisture content of the multi-component gas can be adjusted. In addition, the generator of the present invention has a compact structure, a simple composition, and a high thermal efficiency. More importantly, the present invention can generate multi-component gases with different pressure, temperature, and moisture content ratios through a simple system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0028] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a high-pressure multi-component gas generator provided by an embodiment of the present invention;

[0029] Figure 2 FIG. 2 is a longitudinal sectional view of a high-pressure multi-component gas generator provided by an embodiment of the present invention.

[0030] Wherein:

[0031] 1: burner; 2: high-pressure combustion chamber; 1-1: combustion air inlet flange; 1-2: burner fuel inlet pipe; 1-3: burner outlet flange; 2-1: high-pressure combustion chamber inlet flange; 2-2: high-pressure combustion chamber inlet throat; 2-3: coil pipe A; 2-4: coil pipe B; 2-5: water spray holes; 2-6: high-pressure combustion chamber outlet throat; 2-7: high-pressure combustion chamber outlet flange. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following will describe the technical solutions in the present invention with reference to the drawings.

[0033] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" in the present invention should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly speaking, the use of the word "example" is intended to present concepts in a specific manner. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one of the two can be selected.

[0034] To make the technical problems, technical solutions, and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the drawings and specific embodiments.

[0035] The embodiments of the present invention provide a high-pressure multi-component gas generator. AsFigure 1 and Figure 2 As shown in and

[0036] , it includes a burner 1, a high-pressure combustion chamber 2, a steam generation system, and a multi-component gas generation system;

[0036] The high-pressure combustion chamber is a cylindrical structure formed by double-headed coils. One end of the high-pressure combustion chamber 2 is connected to the high-pressure combustion chamber inlet flange 2-1 through the high-pressure combustion chamber inlet throat 2-2, and the other end of the high-pressure combustion chamber 2 is connected to the high-pressure combustion chamber outlet flange 2-7 through the high-pressure combustion chamber outlet throat 2-6;

[0037] The high-pressure combustion chamber inlet flange 2-1 is connected to the burner outlet flange 1-3. The burner inlet end is the combustion air inlet flange 1-1, and the side of the burner is the burner fuel inlet pipe 1-2;

[0038] The cylindrical structure formed by the double-headed coils is the pressure-bearing shell of the high-pressure combustion chamber. The double-headed coils include coil A 2-3 and coil B 2-4. Coil A is the steam generation system, and coil B and the part of the high-pressure combustion chamber near the outlet constitute the multi-component gas generation system.

[0039] The high-pressure combustion chamber is divided into two parts along the length direction. The part near the burner is the combustion section, and the part near the outlet is the multi-component gas generation section.

[0040] Coil A and coil B are spiral. Their tube pitch and tube diameter are the same. The tube pitch is equal to the tube diameter, and they are integrally welded together by spiral cross-over stacking; Coil A and coil B have the same outer diameter, both being 25 - 100 mm;

[0041] Coil B has water spray holes 2-5 on the tube wall of the multi-component gas generation section of the high-pressure combustion chamber. The water spray holes are evenly distributed along the tube circumference.

[0042] The burner fuel inlet pipe 1-2 extends to the lower end of the high-pressure combustion chamber inlet throat 2-2.

[0043] The flanges used in the generator adopt standard flanges or non-standard flanges. The generator adopts a modular design and can be assembled and used according to actual needs.

[0044] In this embodiment, the inner diameter of the high-pressure combustion chamber is 500 mm, the length is 1500 mm, and the material is heat-resistant stainless steel.

[0045] In use, connect the flange at the outlet of the high-pressure combustion chamber of the generator to the pipeline network. Feed the gas into the combustion section of the high-pressure combustion chamber through the gas burner, and simultaneously feed the high-pressure combustion-supporting air into the high-pressure combustion chamber. After mixing with the gas, combustion occurs. High-pressure water is fed into Coil A (the pressure of the high-pressure water is determined according to the steam power generation or heat supply pressure). High-pressure steam is formed at the outlet of Coil A, and the cooling of the pipe wall is achieved. High-pressure water is fed into Coil B (the pressure of the high-pressure water is determined according to the heavy oil thermal recovery process). The water is sprayed into the combustion chamber through the openings on the pipe wall of Coil B in the multi-component gas generation section, and the water is quickly converted into water vapor in the high-pressure combustion chamber. The formed water vapor is mixed with the gas combustion products to form high-pressure multi-component gas. The obtained high-pressure multi-component gas enters the pipeline network through the flange at the outlet of the high-pressure combustion chamber of the generator and is transported to the heavy oil thermal recovery site of the oilfield.

[0046] It can be seen that the generator of the present invention has a simple structure. The high-pressure combustion chamber is formed by using a double-headed coil. The coil is both a channel for high-pressure water and a pressure-bearing wall surface of the high-pressure combustion chamber, with strong pressure-bearing capacity. Moreover, after high-pressure water is fed into the coil, it can also form cooling for the wall surface. The system has no excessive structural components, and the safety is easy to ensure.

[0047] The following tests are carried out using this generator:

[0048] Example 1

[0049] Generate multi-component gas with a pressure of 20 MPa and a temperature of 370 °C, and require the system to reach the maximum multi-component gas generation amount (corresponding to the maximum heavy oil thermal recovery working condition).

[0050] At this time, the amounts of natural gas and combustion-supporting air fed into the burner are 1000 kg / h and 19000 kg / h respectively. The water supply to Coil A is 0 (Coil A is cooled by the adjacent Coil B), and the high-pressure water supply to Coil B is 14800 kg / h. The generated multi-component gas has a pressure of 20 MPa, a temperature of 370 °C, and a generation amount (output) of 34800 kg / h.

[0051] Example 2:

[0052] Generate multi-component gas with a pressure of 20 MPa and a temperature of 370 °C, and require the lowest moisture content in the multi-component gas (corresponding to the maximum power generation working condition).

[0053] Still use the same high-pressure steam and multi-component gas generator as in Example 1. At this time, the amounts of natural gas and combustion-supporting air fed into the burner are 1000 kg / h and 19000 kg / h respectively. The water supply to Coil A is 14800 kg / h, and the high-pressure water supply to Coil B is 0 (Coil B is cooled by the adjacent Coil A). The generated multi-component gas has a pressure of 20 MPa, a temperature of 370 °C, a generation amount of 20000 kg / h, and 14800 kg / h of power generation / supply hot water steam.

[0054] Example 3:

[0055] Multicomponent gas with a pressure of 20 MPa and a temperature of 370°C is generated, and the heat-carrying intensity of the multicomponent gas is required to be 11.6 MW (corresponding to an intermediate condition between the maximum heavy oil thermal recovery condition and the maximum power generation condition).

[0056] The same high-pressure steam and multicomponent gas generator as in Example 1 is still used and implemented. At this time, the amounts of natural gas and combustion-supporting air supplied to the burner are 1000 kg / h and 19000 kg / h respectively, the amount of water supplied to Coil A is 14800 kg / h, and the amount of high-pressure water supplied to Coil B is 4400 kg / h. At this time, the generated multicomponent gas has a pressure of 20 MPa, a temperature of 370°C, and a generation amount of 34800 kg / h, and the power generation / supply of hot steam is 4400 kg / h.

[0057] The above three embodiments illustrate that for the high-pressure steam and multicomponent gas generator of the present invention, a single system can generate multicomponent gas with different pressures, temperatures, and moisture content ratios, solving the problems such as the single function of the generator in the prior art.

[0058] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A high pressure steam and multi-element gas generator, characterized in that: include: Burners, high pressure combustion chambers, steam generation systems and multi-gas generation systems; The high-pressure combustion chamber is a cylindrical structure formed by a double-ended coil, one end of the high-pressure combustion chamber is connected to the high-pressure combustion chamber inlet flange through the high-pressure combustion chamber inlet throat, and the other end of the high-pressure combustion chamber is connected to the high-pressure combustion chamber outlet flange through the high-pressure combustion chamber outlet throat; The high-pressure combustion chamber inlet flange is connected to the burner outlet flange, the burner inlet end is the combustion air inlet flange, and the burner side is the burner fuel inlet pipe; The cylindrical structure formed by the double-ended coil is the pressure-bearing shell of the high-pressure combustion chamber. The double-ended coil includes coil A and coil B. Coil A is a steam generation system, and coil B and the high-pressure combustion chamber near the outlet constitute a multi-gas generation system.

2. The high pressure steam and multi-element gas generator according to claim 1, characterized in that: The high-pressure combustion chamber is divided into two parts along the length direction. The part close to the burner is the combustion section, and the part close to the outlet is the multi-gas generating section. The combustion section occupies 1 / 4 to 3 / 4 of the length of the high-pressure combustion chamber.

3. The high pressure steam and multi-element gas generator according to claim 1, characterized in that: The coils A and B are in a spiral shape with a tube spacing equal to the tube diameter, and the two spirals are cross-stacked and connected into one by integral welding; the outer diameters of the coils A and B are the same, both of which are 25-100 mm; The coil B is provided with water spray holes on the inner side of the tube wall of the multi-gas generating section of the high-pressure combustion chamber, and the water spray holes are evenly distributed along the circumference of the tube.

4. The high pressure steam and multi-element gas generator according to claim 3, characterized in that: The coil A is fed with high-pressure water from the inlet end to form high-pressure steam at the outlet end, and the coil B is fed with high-pressure water, which is sprayed through the water spray holes to form high-pressure multi-gas at the outlet end of the high-pressure combustion chamber.

5. The high pressure steam and multi-element gas generator according to claim 3, characterized in that: The water spray holes are arranged in 4-16 numbers on each circumference, and the diameter of the water spray holes is 1.5-10 mm.

6. The high pressure steam and multi-element gas generator according to claim 1, characterized in that: The inner diameter of the high-pressure combustion chamber is 50-800 mm, the length is 300-3000 mm, and the material is heat-resistant stainless steel.

7. The high pressure steam and multi-element gas generator according to claim 4, characterized in that: The spraying pressure of the high-pressure water in the coil B is 5-30Mpa, and the spraying pressure of the coil B is greater than the pressure in the high-pressure combustion chamber.

8. The high pressure steam and multi-element gas generator according to claim 1, characterized in that: The pressure in the high-pressure combustion chamber is 5-30MPa.

9. The high pressure steam and multi-element gas generator according to claim 1, characterized in that: The double-ended coil is a multi-ended coil, which is stacked crosswise and connected into one by integral welding, wherein the pitch of each coil is equal to the number of ends×the diameter of the tube.

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