Offshore methanol preparation and energy combined use system
By designing an offshore methanol energy combination system, using hydrogen as fuel and reactants, and using water as a steam source for secondary utilization, the problems of high energy consumption and environmental pollution in traditional processes are solved, and clean and efficient methanol synthesis is achieved.
Patent Information
- Application Number
- CN202421342807.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-06-13
AI Technical Summary
The traditional comprehensive process of synthesis of methanol with hydrogen and CO2 is high in energy consumption and causes pollution to the environment.
An offshore methanol energy combination system was designed to reduce energy consumption and reduce pollution by using hydrogen as fuel and reactants while using the reaction product water as a steam source.
While synthesizing methanol with hydrogen and CO2, it reduces energy consumption and avoids environmental pollution through the use of clean fuel of hydrogen.
Smart Images
Figure CN222872125U_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of ship construction and design, and in particular relates to an offshore methanol energy combined use system. Background Art
[0002] In recent years, countries around the world have conducted a lot of research on CO2 emission reduction and utilization: on the one hand, CO2 emission reduction is achieved by optimizing energy structure, developing clean energy, and improving energy utilization; on the other hand, CO2 is captured and recycled to reduce the amount of CO2 discharged into the atmosphere. At present, the research hotspots are mainly focused on the capture and storage of CO2, and less attention is paid to its resource utilization. With the innovation and progress of science and technology, the resource utilization of CO2 has shown increasingly important scientific and economic value.
[0003] China is rich in renewable energy resources and has mature technology for producing hydrogen using renewable energy. CO2 hydrogenation can produce methanol, which can then be converted into olefins, gasoline, diesel and aromatics, etc. It can also directly produce olefins and gasoline and diesel. Methanol, as the target product of CO2 hydrogenation, has received widespread attention because it is both a clean and efficient fuel and an important chemical raw material. Compared with the production of methanol from synthesis gas, the technology of producing methanol from CO2 hydrogenation can provide cleaner raw materials than coal, which can reduce global greenhouse gas emissions while reducing local air and water pollution. It is understood that the cycle mode of producing hydrogen from renewable energy and then using CO2 hydrogenation to synthesize methanol can be used as a solution to the problem of energy shortage after the oil and gas era.
[0004] The conventional comprehensive process for synthesizing methanol from hydrogen and CO2 consumes a lot of energy and pollutes the environment. The present invention comprehensively utilizes the product water of the reaction process as heating steam and uses hydrogen as fuel, thereby reducing energy consumption and causing no pollution to the environment. Summary of the invention
[0005] In order to solve the above problems, the present invention provides an offshore methanol production energy combined use system, the technical solution adopted is:
[0006] A combined use system for preparing methanol energy offshore, wherein a CO2 storage tank is connected to a CO2 gas supply unit, a CO2 drying dust filter, and an inlet of a compressor unit in sequence through a pipeline; a hydrogen storage tank is connected to a hydrogen gas supply unit, a hydrogen drying dust filter, and an inlet of a compressor unit in sequence through a pipeline.
[0007] The compressor unit outlet is connected to the first-stage reactor, the first-stage cooler, the first-stage gas-liquid separator, the second-stage reactor, the second-stage cooler, and the second-stage gas-liquid separator; three pipelines extend from the second-stage gas-liquid separator, the first pipeline returns to the passage from the first-stage gas-liquid separator to the second-stage reactor; the second pipeline is connected to the methanol storage tank; and the third pipeline is connected to the boiler.
[0008] Pipelines extend from the outlet of the first-stage gas-liquid separator and are respectively connected to the boiler inlet and the methanol storage tank, and the boiler outlet is respectively connected to the first-stage reactor and the second-stage reactor.
[0009] The above-mentioned offshore methanol production energy combined use system further comprises the second-stage reactor being connected to a second-stage reactor catalyst unit.
[0010] The above-mentioned offshore methanol production energy combined use system further comprises the first-stage reactor being connected to a first-stage reactor catalyst unit.
[0011] In the above-mentioned offshore methanol production combined energy use system, further, the water separated by the first and second stage gas-liquid separators is used as the steam water source of the boiler, and the generated steam is used for heating the first stage reactor and the second stage reactor.
[0012] In the above-mentioned offshore methanol energy combined use system, further, the first-stage gas-liquid separator is heated by boiler steam.
[0013] The comprehensive functional design of the present invention not only realizes the synthesis of methanol from hydrogen and carbon dioxide, but also utilizes the hydrogen in the storage tank as a reactant and as a boiler fuel, while the reaction product water is also reused as a steam source; hydrogen as a clean fuel also ensures that the entire system does not emit any polluting gases. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 is a system schematic diagram of the present invention;
[0015] In the figure, 1-CO2 storage tank, 2-hydrogen storage tank, 3-CO2 gas supply unit, 4-hydrogen gas supply unit, 5-CO2 drying dust filter, 6-hydrogen drying dust filter, 7-compressor unit, 8-first stage reactor, 9-first stage reactor catalyst unit, 10-first stage cooler, 11-boiler, 12-first stage gas-liquid separator, 13-second stage reactor, 14-second stage reactor catalyst unit, 15-methanol storage tank, 16-second stage cooler, 17-second stage gas-liquid separator. DETAILED DESCRIPTION
[0016] The present invention will be further described in conjunction with the accompanying drawings.
[0017] like Figure 1 In the offshore methanol energy production combined use system shown, the CO2 storage tank is connected to the CO2 gas supply unit, the CO2 drying dust filter, and the inlet of the compressor unit in sequence through pipelines; the hydrogen storage tank is connected to the hydrogen gas supply unit, the hydrogen drying dust filter, and the inlet of the compressor unit in sequence through pipelines.
[0018] The compressor unit outlet is connected to the first-stage reactor, the first-stage cooler, the first-stage gas-liquid separator, the second-stage reactor, the second-stage cooler, and the second-stage gas-liquid separator; three pipelines extend from the second-stage gas-liquid separator, the first pipeline returns to the passage from the first-stage gas-liquid separator to the second-stage reactor; the second pipeline is connected to the methanol storage tank; and the third pipeline is connected to the boiler.
[0019] The outlet of the first-stage gas-liquid separator has pipelines extending therefrom, which are respectively connected to the boiler inlet and the methanol storage tank. The first-stage gas-liquid separator is heated by boiler steam, and the boiler outlet is respectively connected to the first-stage reactor and the second-stage reactor. The first-stage reactor is connected to the first-stage reactor catalyst unit, and the second-stage reactor is connected to the second-stage reactor catalyst unit. The water separated by the first and second-stage gas-liquid separators is used as the steam water source of the boiler, and the generated steam is used to heat the first-stage reactor and the second-stage reactor.
[0020] The hydrogen and CO2 stored in the storage tank enter the compressor through the hydrogen supply unit and the CO2 supply unit respectively.
[0021] Hydrogen and CO2 are pressurized and enter the first-stage reactor. Under the action of the catalyst, hydrogen and CO2 react to produce methanol, water, and carbon monoxide.
[0022] All products enter the first-stage gas-liquid separator after passing through the condenser. The superheated steam generated by the gas-liquid separator boiler heats the gas-liquid separator. Due to the different boiling points of methanol and water, at normal pressure, the boiling point of methanol is 64.7°C, the boiling point of water is 100°C, and the boiling point difference is 35.3°C. Under reduced pressure conditions, the pressure of the system is reduced, so that the boiling points of methanol and water both drop, and the boiling point difference also decreases accordingly. By adjusting the temperature and pressure of the vacuum distillation equipment, the low-boiling-point methanol evaporates first, and the effective separation of methanol and water can be achieved.
[0023] The separated methanol enters the methanol storage tank, and the separated water enters the boiler.
[0024] Carbon monoxide, CO2 and unreacted hydrogen enter the second-stage reactor, where hydrogen reacts with CO under the action of a catalyst. The products of the second-stage reactor include methanol, water and carbon monoxide.
[0025] All products enter the second-stage gas-liquid separator through the condenser. The second-stage gas-liquid separator is also heated by the superheated steam generated by the boiler. The methanol with the lower boiling point evaporates first due to the different boiling points of methanol and water. The separated methanol enters the methanol storage tank, and the separated water enters the boiler.
[0026] The separated carbon monoxide, CO2 and unreacted hydrogen are returned to the inlet of the second-stage reactor. The water separated by the first and second-stage gas-liquid separators is used as the steam water source of the boiler, and the generated steam is used to heat the first and second-stage reactors; the hydrogen stored in the storage tank is supplied to the boiler as clean fuel.
[0027] CO2 hydrogenation to methanol catalysts mainly include the following three systems:
[0028] a Copper-based catalyst, with copper as the main active ingredient of the catalyst, the most typical one is Cu / ZnO / Al2O3;
[0029] b. Supported precious metal catalysts, such as Pd / ZrO2, Pd / Ga2O3 catalysts, etc.;
[0030] c Metal oxides with semiconductor properties, such as ZnO-ZrO2, In2O3, etc.
[0031] The reactor needs to maintain a certain temperature and pressure, the specific temperature and pressure depend on the reaction principle and the type of catalyst.
Claims
1. An offshore methanol production energy combined use system, characterized in that: The CO2 storage tank (1) is connected to the CO2 gas supply unit (3), the CO2 drying dust removal filter (5), and the inlet of the compressor unit (7) in sequence through pipelines; the hydrogen storage tank (2) is connected to the hydrogen gas supply unit (4), the hydrogen drying dust removal filter (6), and the inlet of the compressor unit in sequence through pipelines; The compressor unit outlet is connected to the first-stage reactor (8), the first-stage cooler (10), the first-stage gas-liquid separator (12), the second-stage reactor (13), the second-stage cooler (16), and the second-stage gas-liquid separator (17); three pipelines extend from the second-stage gas-liquid separator, the first pipeline returns to the passage from the first-stage gas-liquid separator to the second-stage reactor; the second pipeline is connected to the methanol storage tank (15); and the third pipeline is connected to the boiler (11); Pipelines extend from the outlet of the first-stage gas-liquid separator and are respectively connected to the boiler inlet and the methanol storage tank, and the boiler outlet is respectively connected to the first-stage reactor and the second-stage reactor.
2. The offshore methanol production energy combined use system according to claim 1 is characterized in that: The second stage reactor is connected to a second stage reactor catalyst unit (14).
3. The offshore methanol production energy combined use system according to claim 1 is characterized in that: The first stage reactor is connected to a first stage reactor catalyst unit (9).
4. The offshore methanol production energy combined use system according to claim 1 is characterized in that: The water separated by the first and second stage gas-liquid separators is used as the steam water source of the boiler, and the generated steam is used to heat the first stage reactor and the second stage reactor.
5. The offshore methanol production energy combined use system according to claim 1 is characterized in that: The first stage gas-liquid separator is heated by boiler steam.