Method for supplying energy to molten salt medium by using green energy

Abstract

The invention belongs to the field of energy conservation, emission reduction and carbon reduction of green electricity, and discloses a method for supplying energy to a molten salt medium by using green energy. The method comprises the steps that S1, green electricity production equipment is arranged in at least one part of area in a refinery plant, and green electricity is obtained; s2, heating a molten salt medium by using the green electricity; and the heated molten salt medium is used as a heat supply medium of a process with a heating requirement and / or heat energy converted from green electricity is stored through the molten salt medium. The invention solves the problem of high energy consumption of the existing hydrogen production process, achieves the effects of energy conservation, consumption reduction and carbon reduction, and reduces the use of a large amount of petroleum, natural gas and the like.

Description

Technical Field

[0001] The present invention belongs to the field of green electricity energy conservation, emission reduction, carbon reduction and decarbonization, and more specifically, relates to a method for supplying energy to a molten salt medium using green energy. Background Art

[0002] In the context of energy shortage, some countries and regions still need to import large amounts of oil and natural gas. Therefore, significantly reducing the consumption of fuel gases such as natural gas and carbon emissions, and making contributions to energy conservation, emission reduction, carbon reduction and decarbonization are major tasks for chemical plants and refineries. Summary of the Invention

[0003] The object of the present invention is to address the problem of high energy consumption in processes with heating requirements, and propose a method for supplying energy to a molten salt medium using green energy. The present invention solves the problem of high energy consumption in existing hydrogen production processes, achieves the effects of energy conservation, consumption reduction, carbon reduction and decarbonization, and reduces the large use of oil, natural gas, coal, etc.

[0004] To achieve the above object, the present invention provides a method for supplying energy to a molten salt medium using green energy, and the method includes the following steps:

[0005] S1: Set green power production equipment in at least a part of the area within the refinery to obtain green power;

[0006] S2: Use the green power to heat the molten salt medium; and then use the heated molten salt medium as the heat supply medium for the process with heating requirements and / or store the thermal energy converted from the green power through the molten salt medium.

[0007] According to the present invention, preferably, the green power production equipment is at least one of wind power, hydropower and photovoltaic equipment; the set wind power, hydropower and photovoltaic equipment does not affect the normal operation of the devices within the refinery.

[0008] According to the present invention, preferably, the composition of the molten salt is determined according to the heat supply temperature level of the process with heating requirements.

[0009] According to the present invention, preferably, the process with heating requirements is a hydrogen production process.

[0010] According to the present invention, preferably, the heated molten salt is used as an energy supply alternative fuel to supply heat for the hydrogen production process.

[0011] According to the present invention, preferably, the system adopted by the hydrogen production process includes: a raw material feed pipe, a conversion product discharge pipe, a hydrogenation device, a pre-conversion device, a conversion device, a first heat exchanger, a second heat exchanger, a third heat exchanger, a first heat supply center, a second heat supply center and the green power production equipment;

[0012] The green power production equipment is respectively connected to the heat energy inlets of the first heat supply center and the second heat supply center;

[0013] The heating molten salt outlet of the first heat supply center, the molten salt medium inlet and outlet of the third heat exchanger, the molten salt medium inlet and outlet of the second heat exchanger, the molten salt medium inlet and outlet of the first heat exchanger, and the cooling molten salt inlet of the first heat supply center are connected in sequence;

[0014] The heating molten salt outlet of the second heat supply center, the molten salt medium inlet and outlet of the conversion device, and the cooling molten salt inlet of the second heat supply center are connected in sequence;

[0015] The raw material feed pipe, the raw material inlet and outlet of the first heat exchanger, the hydrogenation device, the raw material inlet and outlet of the second heat exchanger, the pre-conversion device, the raw material inlet and outlet of the third heat exchanger, the material inlet of the conversion device, the material outlet of the conversion device, and the conversion product discharge pipe are connected in sequence.

[0016] According to the present invention, preferably, the system adopted by the hydrogen production process further includes a molten salt replenishing device; the molten salt replenishing device, the molten salt medium inlet and outlet of the first heat exchanger, the molten salt medium inlet and outlet of the second heat exchanger, and the molten salt medium inlet of the third heat exchanger are connected in sequence.

[0017] According to the present invention, preferably, the hydrogen production process includes the following steps:

[0018] S1: Obtain green electricity by using the green electricity production device, and the first heat supply center uses the green electricity to heat the molten salt medium flowing through the third heat exchanger, the second heat exchanger, and the first heat exchanger; the second heat supply center uses the green electricity to heat the molten salt medium in the conversion device;

[0019] S2: After the raw material gas of the hydrogen production process is heated by the molten salt medium in the first heat exchanger, it is sent to the hydrogenation device for hydrogenation treatment to obtain a hydrogenated material; the hydrogenated material is heated by the molten salt medium in the second heat exchanger and then sent to the pre-conversion device for treatment to obtain a pre-converted material; the pre-converted material is heated by the molten salt medium in the third heat exchanger and then sent to the conversion device for treatment to obtain a converted material, and is sent to downstream treatment through the conversion product discharge pipe to obtain a hydrogen product.

[0020] According to the present invention, preferably, the hydrogen production process includes using the molten salt replenishing device to provide molten salt for the first heat exchanger, the second heat exchanger, and the third heat exchanger.

[0021] According to the present invention, preferably, the process with a heating requirement is at least one of a carbon dioxide capture process, a steam generation process, an atmospheric and vacuum distillation process, a desulfurization and mercaptan removal process, a light hydrocarbon recovery process, a residue hydrotreating process, a diesel hydrotreating process, a kerosene hydrotreating process, a wax oil hydrotreating process, a catalytic cracking process, a catalytic integration process, a C2 recovery process, a gas fractionation process, an aromatics extraction process, an LPG recovery process, a solvent deasphalting process, a coal gasification process, a coal-to-hydrogen process, a residue gasification process, a residue-to-hydrogen process, a coal-to-olefins process, a residue-to-olefins process, an SZORB process, a sulfur recovery process, a solvent regeneration process, an MTBE process, an acrylonitrile process, a reforming process, a PP process, a polyethylene process, a polypropylene process, an EOEG process, a pyrolysis gasoline hydrogenation process, an ethylbenzene-styrene process, an ethylene process, an ABS process, an alkylation process, an isononyl alcohol process, a synthetic ammonia process, a heavy oil hydrotreating process, an aromatics complex process, a steam cracking process, a butadiene extraction process, a benzene extraction process, an ethylene vinyl acetate resin process, a high-density ethylene process, a full-density ethylene process, a styrene process, a C5 separation process, an acid water gas process, a solvent deasphalting process, a higher alcohol process, a detergent process, a cosmetics production process, a fertilizer production process, a chemical product production process, and an oil product production process. In the present invention, specifically, the equipment with a heating requirement is at least one of a reboiler, a heater, a superheater, and a steam generator.

[0022] The beneficial effects of the technical solution of the present invention are as follows:

[0023] The present invention converts green electricity into heat energy to heat a molten salt medium, and then uses the heated molten salt medium as a heat supply medium for a hydrogen production process (the existing steam reforming hydrogen production process), so that the hydrogen production process does not use fuel, solves the problem of high energy consumption in the existing hydrogen production process, achieves the effects of energy conservation, consumption reduction, carbon reduction, and reduces the large amount of use of petroleum, natural gas, etc. At the same time, the process flow of the traditional hydrogen production device is greatly simplified, which is of great significance.

[0024] Other features and advantages of the present invention will be described in detail in the following specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By describing the exemplary embodiments of the present invention in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present invention will become more obvious. Among them, in the exemplary embodiments of the present invention, the same reference numerals generally represent the same components.

[0026] Figure 1 FIG. 1 shows a schematic diagram of a system adopted by a hydrogen production process for a method of using green energy to supply energy to a molten salt medium according to Embodiment 1 of the present invention.

[0027] The description of the reference numerals in the drawings is as follows:

[0028] A: Raw material feed pipe, B: Conversion product discharge pipe, C: Green power production equipment, D: Molten salt replenishment device, E: Hydrogenation equipment, F: Pre-conversion equipment, G: Conversion equipment, M: First heat exchanger, N: Second heat exchanger, Q: Third heat exchanger, T1: First heat supply center, T2: Second heat supply center. Detailed implementation mode

[0029] 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.

[0030] Example 1

[0031] This embodiment provides a method for supplying energy to a molten salt medium using green energy, and the method includes the following steps:

[0032] S1: Set green power production equipment in at least a part of the refinery to obtain green power; the green power production equipment is at least one of wind power, hydropower, and photovoltaic power; the set wind power, hydropower, and photovoltaic power equipment does not affect the normal operation of the devices in the refinery;

[0033] S2: Use the green power to heat the molten salt medium; use the heated molten salt as an energy supply alternative fuel to supply heat for the hydrogen production process. Specifically:

[0034] As Figure 1 shown, the system adopted by the hydrogen production process includes: raw material feed pipe A, conversion product discharge pipe B, molten salt replenishment device D, hydrogenation equipment E, pre-conversion equipment F, conversion equipment G, first heat exchanger M, second heat exchanger N, third heat exchanger Q, first heat supply center T1, second heat supply center T2, and the green power production equipment C;

[0035] The green power production equipment C is respectively connected to the heat energy inlets of the first heat supply center T1 and the second heat supply center T2;

[0036] The heated molten salt outlet of the first heat supply center T1, the molten salt medium inlet and outlet of the third heat exchanger, the molten salt medium inlet and outlet of the second heat exchanger, the molten salt medium inlet and outlet of the first heat exchanger, and the cooling molten salt inlet of the first heat supply center are connected in sequence;

[0037] The heated molten salt outlet of the second heat supply center T2, the molten salt medium inlet and outlet of the conversion equipment, and the cooling molten salt inlet of the second heat supply center are connected in sequence;

[0038] The raw material feed pipe A, the raw material inlets and outlets of the first heat exchanger, the hydrogenation device E, the raw material inlets and outlets of the second heat exchanger, the pre-reformation device F, the raw material inlets and outlets of the third heat exchanger, the material inlet of the reforming device G, the material outlet of the reforming device, and the reformed product discharge pipe B are connected in sequence;

[0039] The molten salt replenishing device D, the molten salt medium inlets and outlets of the first heat exchanger, the molten salt medium inlets and outlets of the second heat exchanger, and the molten salt medium inlet of the third heat exchanger are connected in sequence.

[0040] The hydrogen production process specifically includes the following steps:

[0041] S1: Obtain green power using the green power production device. The first heat supply center uses the green power to heat the molten salt medium flowing through the third heat exchanger, the second heat exchanger, and the first heat exchanger; the second heat supply center uses the green power to heat the molten salt medium in the reforming device;

[0042] S2: After the raw material gas of the hydrogen production process is heated by the molten salt medium in the first heat exchanger, it is sent to the hydrogenation device E for hydrogenation treatment to obtain hydrogenated material; the hydrogenated material is heated by the molten salt medium in the second heat exchanger and then sent to the pre-reformation device F for treatment to obtain pre-reformed material; the pre-reformed material is heated by the molten salt medium in the third heat exchanger and then sent to the reforming device G for treatment to obtain reformed material, and is sent to downstream treatment through the reformed product discharge pipe B to obtain hydrogen products.

[0043] The hydrogen production process further includes using the molten salt replenishing device D to provide molten salt for the first heat exchanger M, the second heat exchanger N, and the third heat exchanger Q.

[0044] The steam reforming hydrogen production device used in this embodiment is 140,000 standard cubic meters per hour. Adopting the process of this embodiment will reduce the fuel consumption by 16,077 kg of standard oil per hour, which is equivalent to reducing carbon dioxide emissions by 47 tons per hour.

[0045] The various embodiments of the present invention have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for supplying energy to a molten salt medium using green energy, characterized in that, the method comprises the following steps: S1: Set up green power production equipment in at least a part of the refinery area to obtain green power; S2: Use the green power to heat the molten salt medium; and then use the heated molten salt medium as the heat supply medium for the process with a heating requirement and / or store the thermal energy converted from the green power through the molten salt medium.

2. The method for supplying energy to a molten salt medium using green energy according to claim 1, wherein, the green power production equipment is at least one of wind power, hydropower and photovoltaic power equipment; the installed wind power, hydropower and photovoltaic power equipment does not affect the normal operation of the devices in the refinery.

3. The method for supplying energy to a molten salt medium using green energy according to claim 1, wherein, the composition of the molten salt is determined according to the heat supply temperature level of the process with a heating requirement.

4. The method for supplying energy to a molten salt medium using green energy according to claim 1, wherein, the process with a heating requirement is a hydrogen production process.

5. The method for supplying energy to a molten salt medium using green energy according to claim 4, wherein, use the heated molten salt as an energy supply alternative fuel to supply heat to the hydrogen production process.

6. The method for supplying energy to a molten salt medium using green energy according to claim 5, wherein, the system adopted by the hydrogen production process includes: a raw material feed pipe, a converted product discharge pipe, a hydrogenation device, a pre-conversion device, a conversion device, a first heat exchanger, a second heat exchanger, a third heat exchanger, a first heat supply center, a second heat supply center and the green power production equipment; the green power production equipment is respectively connected to the heat energy inlets of the first heat supply center and the second heat supply center; the heated molten salt outlet of the first heat supply center, the molten salt medium inlet and outlet of the third heat exchanger, the molten salt medium inlet and outlet of the second heat exchanger, the molten salt medium inlet and outlet of the first heat exchanger and the cooled molten salt inlet of the first heat supply center are connected in sequence; the heated molten salt outlet of the second heat supply center, the molten salt medium inlet and outlet of the conversion device and the cooled molten salt inlet of the second heat supply center are connected in sequence; the raw material feed pipe, the raw material inlet and outlet of the first heat exchanger, the hydrogenation device, the raw material inlet and outlet of the second heat exchanger, the pre-conversion device, the raw material inlet and outlet of the third heat exchanger, the material inlet of the conversion device, the material outlet of the conversion device and the converted product discharge pipe are connected in sequence.

7. The method for supplying energy to a molten salt medium using green energy according to claim 6, wherein, the system adopted by the hydrogen production process further includes a molten salt replenishing device; the molten salt replenishing device, the molten salt medium inlet and outlet of the first heat exchanger, the molten salt medium inlet and outlet of the second heat exchanger and the molten salt medium inlet of the third heat exchanger are connected in sequence.

8. The method for supplying energy to a molten salt medium using green energy according to claim 5, wherein, the hydrogen production process comprises the following steps: S1: Obtain green power using the green power production equipment, and the first heat supply center uses the green power to heat the molten salt medium flowing through the third heat exchanger, the second heat exchanger and the first heat exchanger; the second heat supply center uses the green power to heat the molten salt medium in the conversion device; S2: After the feed gas of the hydrogen production process is heated by the molten salt medium in the first heat exchanger, it is sent to the hydrogenation equipment for hydrogenation treatment to obtain a hydrogenated material; the hydrogenated material is heated by the molten salt medium in the second heat exchanger and then sent to the pre-reformer for treatment to obtain a pre-reformed material; the pre-reformed material is heated by the molten salt medium in the third heat exchanger and then sent to the reformer for treatment to obtain a reformed material, which is sent downstream for treatment through the reformed product discharge pipe to obtain a hydrogen product.

9. The method for supplying energy to the molten salt medium using green energy according to claim 8, wherein, the hydrogen production process includes using the molten salt replenishing device to supply molten salt to the first heat exchanger, the second heat exchanger, and the third heat exchanger.

10. The method for supplying energy to the molten salt medium using green energy according to claim 1, wherein, the process with a heating requirement is at least one of carbon dioxide capture process, steam generation process, atmospheric and vacuum distillation process, desulfurization and mercaptan removal process, light hydrocarbon recovery process, residue hydrotreating process, diesel hydrotreating process, kerosene hydrotreating process, wax oil hydrotreating process, catalytic cracking process, catalytic integration process, C2 recovery process, gas fractionation process, aromatics extraction process, LPG recovery process, solvent deasphalting process, coal gasification process, coal-to-hydrogen process, residue gasification process, residue-to-hydrogen process, coal-to-olefin process, residue-to-olefin process, SZORB process, sulfur recovery process, solvent regeneration process, MTBE process, acrylonitrile process, reforming process, PP process, polyethylene process, polypropylene process, EOEG process, pyrolysis gasoline hydrogenation process, ethylbenzene-styrene process, ethylene process, ABS process, alkylation process, isononyl alcohol process, synthetic ammonia process, heavy oil hydrotreating process, aromatics combination process, steam cracking process, butadiene extraction process, benzene extraction process, ethylene-vinyl acetate resin process, high-density ethylene process, full-density ethylene process, styrene process, C5 separation process, acid water gas process, solvent deasphalting process, higher alcohol process, detergent process, cosmetics production process, fertilizer production process, chemical product production process, and oil product production process.

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