CN203335050U - Steam generating device for seabed natural gas hydrate exploitation - Google Patents

Abstract

The utility model relates to a steam generating device for exploitation of seabed natural gas hydrate. Its technical solution is: including burner, steam pipeline, combustion chamber, high-temperature flue gas pipeline, water jacket chamber, ribs, water inlet pipe, combustion-supporting air pipe, gas pipe, the water jacket chamber and combustion chamber are cylindrical, The water jacket chamber is provided with a water inlet pipe and a steam pipe, and the water jacket chamber wraps the combustion chamber, and the space between the water jacket chamber and the combustion chamber is filled with water; the outer wall of the combustion chamber is provided with multiple ribs; the lower end of the burner extends into Combustion chamber, the burner is equipped with an electric spark igniter, and connected to the combustion air pipe, gas pipe and high-temperature flue gas pipe, the beneficial effect is: because the device directly burns under water to generate high-temperature steam, avoiding the Heat loss, and the high-temperature combustion products produced by combustion first heat the water in the water jacket, and then are discharged together with the hot steam, making full use of the heat, so it has good economic benefits and application prospects.

Description

Submarine natural gas hydrate exploitation steam generation device

technical field

The utility model relates to a device capable of generating high-temperature steam underwater, in particular to a steam generating device for exploiting seabed natural gas hydrate.

Background technique

With the depletion of onshore petroleum and petrochemical energy, human beings are constantly looking for new energy sources. As an important and clean potential energy source, natural gas hydrate is attracting the attention of scientists and governments from all over the world. The unique crystal structure and molecular space configuration determine the unique high-concentration gas ability of natural gas hydrate. A unit volume of natural gas hydrate can release 160 to 180 times the volume of methane gas. It is estimated that 90% of the ocean has the conditions for the occurrence of gas hydrate. Based on this, the global carbon content of gas hydrates is currently estimated to be twice that of the global fossil fuels (oil, natural gas, and coal). In this sense, it is an indisputable fact that natural gas hydrate has become a clean and efficient alternative energy resource in the 21st century. The discovery, exploration, development and research of natural gas hydrate deposits are of great value.

Natural gas hydrate exists in a solid state in the formation storage environment (low temperature, high pressure), and will be decomposed into water and natural gas during the production process due to decompression or temperature rise. The development of gas hydrate must control the decomposition of solid to liquid and gas, and control the gas and water decomposed during the recovery process to form gas hydrate again. This is a technical difficulty in gas hydrate exploitation.

Thermal recovery method is the most researched and deepest natural gas hydrate recovery technology in natural gas hydrate recovery. The existing thermal recovery method is to use drilling technology to install pipelines in the natural gas hydrate stable layer, heat the hydrate formation, increase the temperature of the reservoir, cause the natural gas hydrate to decompose, and then use the pipeline to collect the decomposed natural gas. The main method is to inject steam, hot water, and hot brine generated on the foundation or sea-based platform from the ground into the hydrate layer. These methods have their own advantages and disadvantages. For example, the heat loss of steam injection in a thin hydrate gas layer is very large, and the thermal efficiency is high only when the gas layer is larger than 15m; the heat loss of hot water injection is smaller than that of steam injection, but the injection rate of water in the hydrate gas layer This limits the large-scale use of this method. Thermal mining techniques especially in permafrost areas, even with insulated pipes, permafrost will reduce the effective heat transfer to the reservoir. In summary, heat loss during heat and mass transfer is the main reason for limiting thermal recovery.

Contents of the invention

The purpose of this utility model is to aim at the above-mentioned defects existing in the prior art, to provide a subsea natural gas hydrate exploitation steam generating device, which can avoid the heat loss in the steam transmission process, achieve the purpose of efficient exploitation of natural gas hydrate, and can stably and continuously running.

Its technical solution is: including burner, steam pipeline, combustion chamber, high-temperature flue gas pipeline, water jacket chamber, ribs, water inlet pipe, combustion-supporting air pipe, gas pipe, the water jacket chamber and combustion chamber are cylindrical, The water jacket chamber is provided with a water inlet pipe and a steam pipe, and the water jacket chamber wraps the combustion chamber, and the space between the water jacket chamber and the combustion chamber is filled with water; the outer wall of the combustion chamber is provided with multiple ribs; the lower end of the burner extends into Combustion chamber, the burner is equipped with an electric spark igniter, and connected to the combustion air pipeline, gas pipeline and high-temperature flue gas pipeline, the gas is pressurized by the compressor on the sea-based platform and enters the combustion chamber through the burner, and the combustion air is supplied by the combustion air The pipe enters the combustion chamber, and the electric spark igniter forms a flame to burn in the combustion chamber. The flame generates heat to heat the water in the water jacket, and generates high-temperature steam, which is passed out through the steam pipe.

The outer wall of the above-mentioned combustion chamber is provided with a plurality of rectangular parallelepiped ribs.

The above-mentioned water inlet pipe is connected to the top of the water jacket chamber.

The above-mentioned steam pipeline is connected to the side wall of the water jacket chamber.

The above-mentioned high-temperature flue gas pipeline is arranged at the bottom of the combustion chamber.

The beneficial effects of the utility model are: because the device directly burns under water to generate high-temperature steam, heat loss during steam transportation is avoided, and the high-temperature combustion products generated by combustion first heat the water in the water jacket, and then together with the hot steam Exhaust, make full use of the heat. Therefore, the device has good economic benefits and application prospects.

Description of drawings

Accompanying drawing 1 is the structural representation of the utility model;

Above: burner 1, steam pipe 2, combustion chamber 3, high temperature flue gas pipe 4, water jacket chamber 5, rib plate 6, water inlet pipe 7, combustion-supporting air pipe 8, gas pipe 9, spark igniter 10 .

Detailed ways

In conjunction with accompanying drawing 1, the utility model is further described:

The utility model comprises a burner 1, a steam pipe 2, a combustion chamber 3, a high-temperature flue gas pipe 4, a water jacket chamber 5, ribs 6, a water inlet pipe 7, a combustion-supporting air pipe 8, and a gas pipe 9. The water jacket chamber 5 and the combustion chamber 3 are cylindrical, the water jacket chamber 5 is provided with a water inlet pipe 7 and a steam pipe 2, the water jacket chamber 5 wraps the combustion chamber 3, and the space between the water jacket chamber 5 and the combustion chamber 3 is filled with water; the combustion chamber 3 The outer wall is provided with a plurality of ribs 6; the lower end of the burner 1 extends into the combustion chamber 3, and the burner 1 is provided with an electric spark igniter 10, which is connected to the combustion air pipe 8, the gas pipe 9 and the high temperature flue gas pipe 4; Among them, the outer wall of the combustion chamber 3 is provided with a plurality of cuboid-shaped ribs 6, the water inlet pipe 7 is connected to the top of the water jacket chamber 5, the steam pipe 2 is connected to the side wall of the water jacket chamber 5, and the high-temperature flue gas pipe 4 is arranged on the bottom of combustion chamber 3.

When in use, first a hole is drilled in the natural gas hydrate reservoir by a seabed drilling rig, and the utility model is put into the hole, and the gas is pressurized by the compressor on the sea-based platform and enters the combustion chamber 3 through the burner 1, and the combustion-supporting air The combustion-supporting air pipe 8 enters the combustion chamber 3, and the electric spark igniter 10 forms a flame to burn in the combustion chamber. The flame generates heat to heat the water in the water jacket to generate high-temperature steam, which is vented out through the steam pipe. The heat generated by the flame heats the water in the water jacket to generate high-temperature steam, which is passed out through the steam pipeline to heat the solid gas hydrate on the seabed. The high-temperature combustion products produced by combustion are first passed into the water in the water jacket through the high-temperature flue gas pipe 4, which also has a heating effect, and then are discharged together with the hot steam.

The natural gas hydrate is heated and vaporized, and collected to the shore through pipelines for subsequent processing.

The natural gas required for combustion is provided by the compressor on the sea-based platform, and enters the steam generator through the gas pipeline. The required combustion air is provided by a fan. The water in the water jacket is provided by a water pump.

Because the device directly burns under water to generate high-temperature steam, heat loss during steam transportation is avoided, and the high-temperature combustion products generated by combustion first heat the water in the water jacket, and then are discharged together with the hot steam, making full use of the heat. Therefore, the device has good economic benefits and application prospects.

Claims (5)

1. A steam generating device for subsea natural gas hydrate exploitation, characterized in that it includes a burner (1), a steam pipeline (2), a combustion chamber (3), a high-temperature flue gas pipeline (4), and a water jacket chamber (5) , rib plate (6), water inlet pipe (7), combustion air pipe (8), gas pipe (9), the water jacket chamber (5) and the combustion chamber (3) are cylindrical, and the water jacket chamber (5 ) is equipped with a water inlet pipe (7) and a steam pipe (2), the water jacket chamber (5) wraps the combustion chamber (3), and the space between the water jacket chamber (5) and the combustion chamber (3) is filled with water; the combustion chamber ( 3) The outer wall is provided with a plurality of ribs (6); the lower end of the burner (1) extends into the combustion chamber (3), and the burner (1) is provided with an electric spark igniter (10), which is connected to a combustion-supporting Air pipeline (8), gas pipeline (9) and high-temperature flue gas pipeline (4), the gas is pressurized by the compressor on the sea-based platform and enters the combustion chamber (3) through the burner (1), and the combustion-supporting air is supplied by the combustion-supporting air pipeline (8) After entering the combustion chamber (3), the electric spark igniter (10) forms a flame to burn in the combustion chamber, and the flame generates heat to heat the water in the water jacket to generate high-temperature steam, which is vented out through the steam pipe. 2. The steam generating device for seabed natural gas hydrate exploitation according to claim 1, characterized in that: the outer wall of the combustion chamber (3) is provided with a plurality of rectangular parallelepiped ribs (6). 3. The steam generating device for subsea natural gas hydrate exploitation according to claim 1, characterized in that: the water inlet pipe (7) is connected to the top of the water jacket chamber (5). 4. The steam generating device for seabed natural gas hydrate exploitation according to claim 1, characterized in that: the steam pipeline (2) is connected to the side wall of the water jacket chamber (5). 5. The steam generating device for seabed natural gas hydrate exploitation according to claim 1, characterized in that: the high-temperature flue gas pipeline (4) is arranged at the bottom of the combustion chamber (3).

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