Saturated hydrocarbon water vapor conversion hydrogen production system and method

Abstract

The invention belongs to the field of hydrogen production technology and emission reduction, and discloses a system and a method for producing hydrogen by converting saturated hydrocarbon water vapor. The system comprises a saturated hydrocarbon feeding pipeline, a purification device, a water vapor feeding pipeline, a mixer, a first heating device, a conversion device, a first cooling device, a conversion device, a second cooling device, a hydrogen purification device and a product hydrogen pipeline. The method provided by the invention solves the problem of harsh desulfurization operation conditions, cancels hydrogenation reaction equipment, simplifies the process, and solves the problem of simultaneous removal of various impurities such as organic sulfur and inorganic sulfur.

Description

Technical Field

[0001] This invention belongs to the field of hydrogen production technology and emission reduction, and more specifically, relates to a system and method for hydrogen production by steam conversion of saturated hydrocarbons. Background Technology

[0002] Currently, in hydrocarbon steam reforming for hydrogen production, a hydrogenation reaction device is set up to convert organic sulfur in hydrocarbons into inorganic sulfur, which is then removed from the hydrocarbon feedstock using a desulfurization device. Therefore, it is evident that the purification process before hydrogen production is complex, and both the hydrogenation and desulfurization reactions are conducted at high temperatures, resulting in harsh operating conditions.

[0003] Therefore, there is an urgent need to propose a system and method for hydrogen production by steam reforming saturated hydrocarbons. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a saturated hydrocarbon steam reforming hydrogen production system and method. This invention solves the problem of harsh desulfurization operating conditions, eliminates the need for hydrogenation reaction equipment, simplifies the process, and addresses the issue of simultaneously removing multiple impurities, including organic and inorganic sulfur.

[0005] To achieve the above objectives, the present invention provides a saturated hydrocarbon steam reforming hydrogen production system, the system comprising: a saturated hydrocarbon feed pipeline, a purification device, a steam feed pipeline, a mixer, a first heating device, a reforming device, a first cooling device, a conversion device, a second cooling device, a hydrogen purification device, and a product hydrogen pipeline.

[0006] The purification equipment is equipped with a purification agent and is used to simultaneously remove organic sulfur and inorganic sulfur from saturated hydrocarbon feed.

[0007] The saturated hydrocarbon feed pipeline is connected in sequence to the inlet of the purification equipment;

[0008] The outlet of the purification equipment and the steam feed pipeline are simultaneously connected to the inlet of the mixer; the outlet of the mixer is sequentially connected to the first heating device, the conversion device, the first cooling device, the conversion device, the second cooling device, the hydrogen purification device, and the product hydrogen pipeline.

[0009] According to the present invention, preferably, the saturated hydrocarbon feed line is a gas-phase saturated hydrocarbon feed line and / or a liquid-phase saturated hydrocarbon feed line.

[0010] According to the present invention, preferably, the purification device comprises multiple purifiers connected in parallel, and the saturated hydrocarbon feed line is connected to at least one purifier.

[0011] According to the present invention, preferably, the hydrogen purification equipment is at least one of pressure swing adsorption equipment, membrane separation equipment, and chemical hydrogen purification equipment.

[0012] In this invention, whether or not to install a booster device is determined based on economic factors and the heavy hydrocarbon content of the raw material. If the heavy hydrocarbon content is high, the conversion catalyst is prone to coking.

[0013] According to the present invention, preferably, a pressure boosting device is provided between the saturated hydrocarbon feed line and the purification equipment.

[0014] According to the present invention, preferably, the inlet of the purification equipment is also connected to the regeneration gas feed pipeline through a second heating device; the outlet of the purification equipment is also connected in sequence to the desulfurization regeneration waste gas discharge pipeline and the sulfur recovery equipment through a third cooling device.

[0015] Another aspect of the present invention provides a method for producing hydrogen from saturated hydrocarbons via steam reforming. The method employs the aforementioned system and includes the following steps:

[0016] Saturated hydrocarbon raw materials are fed into the purification equipment, where impurities are removed by a purifying agent to obtain purified raw materials; wherein, the impurities include organic sulfur and inorganic sulfur.

[0017] The purified raw material is mixed with water vapor and heated before being fed into the conversion equipment for water vapor conversion to produce hydrogen. The conversion product is then subjected to a first cooling, conversion, second cooling and purification process to obtain product hydrogen.

[0018] In this invention, the purified raw material is mixed with water vapor and heated before being fed into the conversion equipment for water vapor conversion to produce hydrogen. In other words, the purified raw material obtained by this invention meets the requirements of the catalyst in the conversion equipment and the catalyst in the shift conversion equipment.

[0019] According to the present invention, preferably, the unsaturated hydrocarbon feedstock is a gaseous unsaturated hydrocarbon feedstock (including natural gas, liquefied petroleum gas and various refinery gases) and / or a liquid-phase unsaturated hydrocarbon feedstock (e.g., light oil).

[0020] According to the present invention, preferably, the method further includes feeding the saturated hydrocarbon raw material into the purification equipment after pressurization.

[0021] According to the present invention, preferably, when the purifying agent is saturated with adsorption, the saturated purifying agent is regenerated using regeneration gas to obtain desulfurization regeneration waste gas, which is then sent to the sulfur recovery equipment for recovery.

[0022] According to the present invention, preferably, when the purification equipment consists of multiple purifiers connected in parallel, saturated hydrocarbon raw materials are fed into some of the purifiers to remove impurities; and when the purifying agent installed in the purifier for removing impurities becomes saturated, the saturated purifying agent is regenerated using regeneration gas, while the saturated hydrocarbon raw materials are fed into other purifiers connected in parallel to remove impurities, thereby achieving continuous operation.

[0023] In this invention, as a preferred embodiment, the purification device consists of two purifiers connected in parallel, one in operation and one on standby. While one purifier is performing regeneration, the other purifier is removing impurities.

[0024] According to the present invention, preferably, the temperature at which the purification equipment removes impurities is 0-80°C and the pressure is 0.1-100 MPag.

[0025] According to the present invention, preferably, the impurities include: hydrogen sulfide, carbonyl sulfide, thiols, thioethers, ammonia, and carbon disulfide.

[0026] According to the present invention, preferably, the regenerated gas is at least one of nitrogen, purified product gas, and liquefied natural gas.

[0027] According to the present invention, preferably, the purifying agent is Huabang DCH-02 and / or Guangzhou Guangyi GY-TC-04.

[0028] The beneficial effects of the technical solution of the present invention are as follows:

[0029] This invention uses a purifying agent for desulfurization (hydrogen sulfide, carbonyl sulfide, mercaptan, thioether, ammonia, carbon disulfide, etc.) before hydrogen production, replacing the above-mentioned "hydrogenation reaction and desulfurization reaction" scheme. The reaction conditions for desulfurization using the purifying agent in this invention are relatively low compared to the prior art, which solves the problem of harsh operating conditions in existing desulfurization operations.

[0030] This invention eliminates the hydrogenation reaction equipment, simplifies the process, and solves the problem of simultaneously removing multiple impurities such as organic sulfur and inorganic sulfur.

[0031] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0032] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0033] Figure 1 A schematic diagram of a saturated hydrocarbon steam reforming hydrogen production system provided in Embodiment 1 of the present invention is shown.

[0034] The annotations in the attached figures are explained as follows:

[0035] T1 Liquid phase unsaturated hydrocarbon feed line, T2 Gas phase unsaturated hydrocarbon feed line, T3 Steam feed line, T4 Product hydrogen feed line;

[0036] E-purification equipment;

[0037] C. First heating device;

[0038] D1 is the first cooling device, and D2 is the second cooling device;

[0039] H Mixer, R Other Mixers;

[0040] F conversion equipment, G conversion equipment, M hydrogen purification equipment;

[0041] Q is a gas booster device, and P is a liquid booster device. Detailed Implementation

[0042] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0043] Example 1

[0044] This embodiment provides a saturated hydrocarbon steam reforming hydrogen production system, such as... Figure 1 As shown, the system includes: a saturated hydrocarbon feed line, a purification device E, a steam feed line T3, a mixer H, a first heating device C, a conversion device F, a first cooling device D1, a conversion device G, a second cooling device D2, a hydrogen purification device M, and a product hydrogen pipeline T4.

[0045] The purification equipment E is equipped with a purification agent, and the purification equipment E is used to simultaneously remove organic sulfur and inorganic sulfur from unsaturated hydrocarbon feed.

[0046] The unsaturated hydrocarbon feed lines are gas phase unsaturated hydrocarbon feed line T2 and liquid phase unsaturated hydrocarbon feed line T1;

[0047] The gaseous unsaturated hydrocarbon feed line T2 and the liquid unsaturated hydrocarbon feed line T1 are respectively connected to the inlet of the purification equipment E through the gas booster Q and the liquid booster P, and the outlet of the purification equipment E and the water vapor feed line T3 are simultaneously connected to the inlet of the mixer H; the outlet of the mixer H is sequentially connected to the first heating equipment C, the conversion equipment F, the first cooling equipment D1, the conversion equipment G, the second cooling equipment D2, the hydrogen purification equipment M, and the product hydrogen pipeline T4.

[0048] The hydrogen purification equipment M is at least one of pressure swing adsorption equipment, membrane separation equipment, and chemical hydrogen purification equipment.

[0049] This embodiment also provides a method for producing hydrogen from saturated hydrocarbons via steam reforming. The method uses the above-described system and includes the following steps:

[0050] Gas-phase unsaturated hydrocarbon feedstock and liquid-phase unsaturated hydrocarbon feedstock are pressurized and fed into purification equipment E. Impurities are removed under the action of a purifying agent set in the purification equipment E to obtain purified feedstock. The impurities include hydrogen sulfide, carbonyl sulfide, mercaptan, thioether, ammonia and carbon disulfide.

[0051] The purified raw material is mixed with water vapor and heated before being sent to the conversion equipment F for water vapor conversion to produce hydrogen. The conversion product is then subjected to a first cooling, conversion, second cooling and purification process to obtain product hydrogen.

[0052] The purifying agent is Huabang DCH-02. The purification equipment removes impurities at a temperature of 0-80℃ and a pressure of 0.1-100 MPag.

[0053] In this embodiment, purification is carried out at a lower temperature. The purification equipment removes both organic and inorganic sulfur, eliminating the need for hydrogenation reaction equipment, reducing the operational severity of the equipment, and simplifying the process.

[0054] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A saturated hydrocarbon steam reforming hydrogen production system, characterized in that, The system includes: a saturated hydrocarbon feed line, a purification device, a steam feed line, a mixer, a first heating device, a conversion device, a first cooling device, a conversion device, a second cooling device, a hydrogen purification device, and a product hydrogen pipeline. The purification equipment is equipped with a purification agent and is used to simultaneously remove organic sulfur and inorganic sulfur from saturated hydrocarbon feed. The saturated hydrocarbon feed pipeline is connected in sequence to the inlet of the purification equipment; The outlet of the purification equipment and the steam feed pipeline are simultaneously connected to the inlet of the mixer; the outlet of the mixer is sequentially connected to the first heating device, the conversion device, the first cooling device, the conversion device, the second cooling device, the hydrogen purification device, and the product hydrogen pipeline.

2. The saturated hydrocarbon steam reforming hydrogen production system according to claim 1, wherein, The saturated hydrocarbon feed line is a gas-phase saturated hydrocarbon feed line and / or a liquid-phase saturated hydrocarbon feed line; The purification equipment consists of multiple purifiers connected in parallel, and the saturated hydrocarbon feed line is connected to at least one purifier. The hydrogen purification equipment is at least one of pressure swing adsorption equipment, membrane separation equipment, and chemical hydrogen purification equipment.

3. The saturated hydrocarbon steam reforming hydrogen production system according to claim 1, wherein, A pressure boosting device is installed between the saturated hydrocarbon feed pipeline and the purification equipment.

4. The saturated hydrocarbon steam reforming hydrogen production system according to claim 1, wherein, The inlet of the purification equipment is also connected to the regeneration gas feed pipeline through a second heating device; the outlet of the purification equipment is also connected in sequence to the desulfurization regeneration waste gas discharge pipeline and the sulfur recovery equipment through a third cooling device.

5. A method for producing hydrogen from saturated hydrocarbons via steam reforming, characterized in that, The method employs the system described in any one of claims 1-4 and includes the following steps: Saturated hydrocarbon raw materials are fed into the purification equipment, where impurities are removed by a purifying agent to obtain purified raw materials; wherein, the impurities include organic sulfur and inorganic sulfur. The purified raw material is mixed with water vapor and heated before being fed into the conversion equipment for water vapor conversion to produce hydrogen. The conversion product is then subjected to a first cooling, conversion, second cooling and purification process to obtain product hydrogen.

6. The method for producing hydrogen from saturated hydrocarbons via steam reforming according to claim 5, wherein, The saturated hydrocarbon feedstock is a gas-phase saturated hydrocarbon feedstock and / or a liquid-phase saturated hydrocarbon feedstock.

7. The method for producing hydrogen from saturated hydrocarbons via steam reforming according to claim 5, wherein, The method further includes pressurizing saturated hydrocarbon raw materials before feeding them into the purification equipment.

8. The method for producing hydrogen from saturated hydrocarbons via steam reforming according to claim 5, wherein, When the purifying agent becomes saturated with adsorption, it is regenerated using regeneration gas to obtain desulfurization regeneration waste gas, which is then sent to the sulfur recovery equipment for recovery.

9. The method for producing hydrogen from saturated hydrocarbons via steam reforming according to claim 8, wherein, When the purification equipment consists of multiple purifiers connected in parallel, saturated hydrocarbon raw materials are fed into some of the purifiers to remove impurities. Furthermore, when the purifying agent in the purifier that is removing impurities becomes saturated, regeneration gas is used to regenerate the saturated purifying agent. At the same time, the saturated hydrocarbon raw materials are fed into other purifiers connected in parallel to remove impurities, thereby achieving continuous operation.

10. The method for producing hydrogen from saturated hydrocarbons via steam reforming according to claim 5, wherein, The purification equipment removes impurities at a temperature of 0-80℃ and a pressure of 0.1-100 MPag. The impurities include: hydrogen sulfide, carbonyl sulfide, thiols, thioethers, ammonia, and carbon disulfide; The regenerated gas is at least one of nitrogen, purified product gas, and liquefied natural gas; The purifying agent is Huabang DCH-02 or Guangzhou Guangyi GY-TC-04.

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