Method for preparing natural gas

Abstract

The invention provides a method for preparing natural gas. The method comprises the following steps: obtaining a hydrocarbon generation reaction material; obtaining material steam at a first set temperature; feeding hydrocarbon generation reaction materials into the reactor by taking natural gas as conveying gas, and inputting material steam into the reactor; a ripening pyrolysis hydrocarbon generation reaction is performed in the reactor, and natural gas is produced; according to the method for preparing the natural gas, the hydrocarbon generation reaction of material coal is utilized, firstly, a hydrocarbon generation reaction material and high-temperature material steam are obtained, then the hydrocarbon generation reaction material is input into a reactor with the natural gas as conveying gas, meanwhile, the material steam is input, the hydrocarbon generation reaction material and the material steam are subjected to the ripening pyrolysis hydrocarbon generation reaction in the reactor, and the natural gas is a reaction product; further, preparation of the natural gas is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas preparation, and more specifically, relates to a method for preparing natural gas. Background Art

[0002] my country is a large energy consumer. Its resource structure is characterized by more coal, less oil, poor gas, and significant dependence on foreign oil and gas resources. Since the concept and policy of human environmental protection of "clean and efficient use of coal" and "development of a low-carbon economy" were proposed, my country's coal consumption has decreased year by year, and the contradiction between the use and allocation of coal and clean energy has become prominent, which has brought great challenges to my country's energy security. Innovative energy conversion technologies adapted to local conditions, achieving clean and efficient use of coal from the root, and scientifically building a national energy security system are important guarantees for my country's economic development and national security. Summary of the invention

[0003] The purpose of the present invention is to provide a method for preparing natural gas, which subverts the traditional coal-to-natural gas technical means. The process of preparing natural gas is environmentally friendly, simple in process, easy to operate, and has good gas production efficiency and effect.

[0004] In order to achieve the above object, the present invention provides a method for preparing natural gas, comprising:

[0005] obtaining hydrocarbon generation reaction materials;

[0006] Obtaining material steam at a first set temperature;

[0007] Using natural gas as a conveying gas to deliver the hydrocarbon generation reaction material into the reactor, and inputting the material steam into the reactor;

[0008] A ripening pyrolysis and hydrocarbon generation reaction is carried out in the reactor, and natural gas is produced.

[0009] Optionally, obtaining hydrocarbon generation reaction materials includes:

[0010] Get coal of set mesh size.

[0011] Optionally, the set mesh size is 50-200 meshes.

[0012] Optionally, the first set temperature is 300°C-1200°C.

[0013] Optionally, a closed reaction chamber is provided in the reactor, and the reaction chamber is filled with a natural gas atmosphere with an oxygen content of no more than 1%.

[0014] Optionally, the pressure in the reaction chamber is 0.1-2 MPa, and the temperature in the reaction chamber is 500° C.-1500° C.

[0015] Optionally, the material steam is water vapor, and the mass ratio of the hydrocarbon generation reaction material to the material steam is 1:0.5-1:10.

[0016] Optionally, the reaction time of the ripening pyrolysis and hydrocarbon generation reaction is 5s-100s.

[0017] Optionally, the ripening pyrolysis and hydrocarbon generation reaction produces clean coal while producing natural gas. The output of the ripening pyrolysis and hydrocarbon generation reaction passes through a first temperature-controlled heat exchanger, a dust collector, a gas-solid-liquid separator, a desulfurizer and a second temperature-controlled heat exchanger in sequence. Dust is removed in the dust collector and clean coal is output. The natural gas is output after passing through the gas-solid-liquid separator, desulfurization and heat exchange. A portion of the natural gas is input into a pneumatic conveying device as a conveying gas.

[0018] Optionally, after passing through the second temperature-controlled heat exchanger, the output natural gas is also input into a methane catalytic unit.

[0019] The invention provides a method for preparing natural gas, which has the following beneficial effects: the method for preparing natural gas utilizes the hydrocarbon generation reaction of coal material, firstly obtains hydrocarbon generation reaction material and high-temperature material steam, then uses natural gas as a conveying gas to input the hydrocarbon generation reaction material into a reactor, and simultaneously inputs material steam to make it undergo a ripening pyrolysis hydrocarbon generation reaction in the reactor, and natural gas is a reaction product, thereby realizing the preparation of natural gas; the method for preparing natural gas is completely different from the existing coal gasification and methanation catalytic natural gas production technology in the world, and the method for preparing natural gas has the characteristics of not adding oxygen to participate in coal gasification and not adding hydrogen to participate in carbon reaction, the method for preparing natural gas is a derivative technology based on the study of the formation mechanism of coalbed methane, which subverts the traditional coal-to-natural gas technology concept, and its gas production mechanism is a coalbed methane derivative process in which surface organic matter is buried by crust changes and undergoes a long period of time, gradually decomposes to generate hydrocarbons, mudifies to generate hydrocarbons, and coalifies to generate hydrocarbons, and while preparing natural gas by the method for preparing natural gas, another clean coal in the reaction product, that is, the hydrocarbon generation reaction material after use, is still a clean fuel with great economic value.

[0020] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0022] Figure 1 A flow chart of a method for preparing natural gas according to Embodiment 1 of the present invention is shown.

[0023] Figure 2 A process block diagram of a method for preparing natural gas according to Embodiment 1 of the present invention is shown.

[0024] Figure 3 A process block diagram of a method for preparing natural gas according to the second embodiment of the present invention is shown. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0026] Embodiment 1

[0027] like Figure 1 and Figure 2 As shown, the present invention provides a method for preparing natural gas, comprising:

[0028] obtaining hydrocarbon generation reaction materials;

[0029] Obtaining material steam at a first set temperature;

[0030] Using natural gas as a transport gas, the hydrocarbon generation reaction materials are transported into the reactor, and the material steam is input into the reactor;

[0031] Ripening and pyrolysis reactions to generate hydrocarbons are carried out in the reactor, and natural gas is produced.

[0032] Specifically, the method for preparing natural gas utilizes the hydrocarbon generation reaction of the material coal, firstly obtains the hydrocarbon generation reaction material and the high-temperature material steam, then uses natural gas as the conveying gas to input the hydrocarbon generation reaction material into the reactor, and inputs the material steam at the same time, so that it undergoes a ripening pyrolysis hydrocarbon generation reaction in the reactor, and the natural gas is a reaction product, thereby realizing the preparation of natural gas; the method for preparing natural gas is completely different from the currently available international coal gasification and methanation catalytic natural gas production technology, and the method for preparing natural gas has the characteristics of not adding oxygen to participate in the coal gasification and not adding hydrogen to participate in the carbon reaction. The method for preparing natural gas is a derivative technology based on the study of the coalbed methane formation mechanism, which subverts the traditional coal-to-natural gas technology concept, and its gasification mechanism is the coalbed methane derivative process in which the surface organic matter is buried by the changes in the earth's crust, and after a long period of time, gradually decomposes to generate hydrocarbons, mudifies to generate hydrocarbons, and coalifies to generate hydrocarbons. While preparing natural gas by the method for preparing natural gas, another clean coal in the reaction product, that is, the hydrocarbon generation reaction material after use, is still a clean fuel with great economic value.

[0033] Furthermore, the method for preparing natural gas can be applied to: 1. Upgrading of the coal mining industry: converting low-grade coal and coal washing mud into natural gas resources on site and transporting them to the natural gas network through pipelines, which greatly improves the resource value of low-grade coal and coal washing mud, reduces the traffic load burden brought by road transportation, and eliminates environmental pollution caused by coal transportation; 2. Preparing low-cost natural gas for power generation: At present, many gas-fired power plants in my country are basically in a serious loss state and can only rely on financial subsidies to maintain production and operation. If low-cost natural gas resources can be obtained, the gas-fired power generation industry will be able to develop rapidly; 3. Natural gas pipeline peak regulation: The difficulty in peak regulation of natural gas pipelines in winter is a huge supply burden in the energy consumption process of various countries. The method for preparing natural gas is used to establish natural gas pipeline peak regulation stations according to local conditions to solve the technical problems of urban gas supply peak regulation, civilian winter heating peak regulation, and industrial gas peak regulation; 4. Production of chemical raw materials: Methane is an important intermediate for many chemical raw materials.

[0034] In this embodiment, a portion of the produced natural gas is used as transport gas.

[0035] Optionally, obtaining hydrocarbon generation reaction materials includes:

[0036] Get coal of set mesh size.

[0037] Specifically, the coal particles should not be too large to facilitate the blowing of the conveying gas and mixing with the catalyst.

[0038] In this embodiment, 0.5-50% of the coal mass of mineral powder containing iron, copper, cobalt and nickel can be added to the reaction material coal, and the ratio of iron, copper, cobalt and nickel can be adjusted to 4-5:2-3:2-1:2-1 by adjusting the amount of mineral powder added.

[0039] Optionally, the mesh size is set to 50-200 meshes.

[0040] Optionally, the first set temperature is 300°C-1200°C.

[0041] Preferably, the first set temperature is 700-1200°C.

[0042] Further, the first set temperature may be any value of 700° C., 800° C., 900° C., 1000° C., 1100° C., 1200° C., or a range between any two values.

[0043] Optionally, a closed reaction chamber is provided in the reactor, the reaction chamber is filled with a natural gas atmosphere, and the oxygen content is not greater than 1%.

[0044] Optionally, the pressure in the reaction chamber is 0.1-2 MPa, and the temperature in the reaction chamber is 500° C.-1500° C.

[0045] Specifically, an oxygen-poor, high-temperature, and pressurized reaction chamber state is formed in the reactor.

[0046] In this embodiment, the reactor is a fluidized bed reactor.

[0047] Preferably, the pressure in the reaction chamber is 0.1-1.5 MPa.

[0048] Furthermore, the pressure in the reaction chamber may be any value among 0.1, 0.3, 0.5, 0.7, 0.9, 1.0, 1.2, 1.5 MPa or a range between any two values.

[0049] Preferably, the temperature in the reaction chamber is 700°C to 1200°C.

[0050] Further, the temperature in the reaction chamber may be any value of 700° C., 800° C., 900° C., 1000° C., 1100° C., 1200° C., or a range between any two values.

[0051] Optionally, the material steam is water vapor, and the mass ratio of the hydrocarbon generation reaction material to the material steam is 1:0.5-1:10.

[0052] Preferably, the mass ratio of hydrocarbon generation reaction material to material steam is 1:0.5-1:5.

[0053] Furthermore, the mass ratio of the hydrocarbon generation reaction material to the material steam may be any value among 1:0.5, 1:1.5, 1:2, 1:2.5, 1:3, 1:5 or a range value between any two values.

[0054] Specifically, the high-temperature water vapor serves as a ripening agent, a pyrolysis agent, and a catalytic aid for hydrocarbon generation reactions.

[0055] Optionally, the reaction time of the ripening pyrolysis hydrocarbon generation reaction is 5s-100s.

[0056] Preferably, the reaction time of the ripening pyrolysis hydrocarbon generation reaction is 5 to 90 seconds.

[0057] Optionally, the ripening pyrolysis hydrocarbon generation reaction produces clean coal while producing natural gas. The output of the ripening pyrolysis hydrocarbon generation reaction passes through a first temperature-controlled heat exchanger, a dust collector, a gas-solid-liquid separator, a desulfurizer, and a second temperature-controlled heat exchanger in sequence. Dust is removed in the dust collector and clean coal is output. Natural gas is output after passing through the gas-solid-liquid separator, desulfurization, and heat exchange. A portion of the natural gas is input into a pneumatic conveying device as a conveying gas.

[0058] In summary, when the method for preparing natural gas provided by the present invention is used, the hydrocarbon generation reaction material pneumatic conveying device and the high-temperature steam generator are used to convey the hydrocarbon generation reaction material and the high-temperature material steam to a fluidized bed reactor with oxygen deficiency, high temperature of 700-1200°C, and pressure of 0.1-1.5Mpa, respectively, to ripen the hydrocarbon generation reaction material and pyrolyze the hydrocarbon generation reaction, and then after cooling and heat exchange, dust removal, gas-solid-liquid separation, desulfurization, cooling and heat exchange and other processes, a pure natural gas product and more economically valuable clean coal are obtained, and part of the natural gas is used as a conveying gas to convey the hydrocarbon generation reaction material. The method for preparing natural gas is environmentally friendly, simple in process, easy to operate, and has high processing efficiency, and can obtain high-purity natural gas; the highlights in the process include high energy efficiency, low energy consumption, high methane output rate, significant energy-saving effect, small equipment footprint, low one-time investment cost, wide applicability, and easy to promote and use; the method has simple operating steps, short process, and low pollution, and is an advanced energy conversion technology for realizing efficient and clean cascade utilization of coal.

[0059] Embodiment 2

[0060] like Figure 3 As shown, the difference between this embodiment and the first embodiment is that:

[0061] In this embodiment, after passing through the second temperature-controlled heat exchanger, the output natural gas is also input into a methane catalytic unit.

[0062] Specifically, due to the different types of coal used to produce hydrocarbon generation reaction materials, the methane content in the natural gas produced by the reaction in the reactor is different. The method for preparing natural gas can also add a methane catalytic unit according to the purpose of use (LNG production) to further increase the methane content and reduce the LNG production cost.

[0063] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for preparing natural gas, characterized in that: include: obtaining hydrocarbon generation reaction materials; Obtaining material steam at a first set temperature; Using natural gas as a conveying gas to deliver the hydrocarbon generation reaction material into the reactor, and inputting the material steam into the reactor; A ripening pyrolysis and hydrocarbon generation reaction is carried out in the reactor, and natural gas is produced.

2. The method for preparing natural gas according to claim 1, characterized in that: Obtaining hydrocarbon generation reaction materials includes: Get coal of set mesh size.

3. The method for preparing natural gas according to claim 2, characterized in that: The set mesh size is 50-200 meshes.

4. The method for preparing natural gas according to claim 1, characterized in that: The first set temperature is 300°C-1200°C.

5. The method for preparing natural gas according to claim 1, characterized in that: A sealed reaction chamber is arranged in the reactor. The reaction chamber is filled with natural gas atmosphere and the oxygen content is not more than 1%.

6. The method for preparing natural gas according to claim 5, characterized in that: The pressure in the reaction chamber is 0.1-2 MPa, and the temperature in the reaction chamber is 500° C.-1500° C.

7. The method for preparing natural gas according to claim 1, characterized in that: The material steam is water vapor, and the mass ratio of the hydrocarbon generation reaction material to the material steam is 1:0.5-1:

10.

8. The method for preparing natural gas according to claim 1, characterized in that: The reaction time of the ripening pyrolysis and hydrocarbon generation reaction is 5s-100s.

9. The method for preparing natural gas according to claim 1, characterized in that: The ripening pyrolysis and hydrocarbon generation reaction produces clean coal while producing natural gas. The output of the ripening pyrolysis and hydrocarbon generation reaction passes through a first temperature-controlled heat exchanger, a dust collector, a gas-solid-liquid separator, a desulfurizer, and a second temperature-controlled heat exchanger in sequence. Dust is removed in the dust collector and clean coal is output. The natural gas is output after passing through the gas-solid-liquid separator, desulfurization, and heat exchange. A portion of the natural gas is input into a pneumatic conveying device as a conveying gas.

10. The method for preparing natural gas according to claim 9, characterized in that: After passing through the second temperature-controlled heat exchanger, the output natural gas is also input into a methane catalytic unit.

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