Methanol synthesis fuel gas resource utilization device

Abstract

The utility model belongs to the technical field of methanol synthesis fuel, and particularly relates to a methanol synthesis fuel gas resource utilization device which comprises a fuel gas pretreatment unit, the fuel gas pretreatment unit is connected with a fuel gas separation unit, and the fuel gas separation unit is connected with a product conversion unit. The product conversion unit is connected with an energy recovery unit, the whole-process resource utilization of methanol synthesis fuel gas from purification to high-added-value product conversion is realized through cooperative work of a plurality of units such as pretreatment, separation, product conversion and the like, and the energy utilization efficiency and the economic benefit are remarkably improved; the combined separation technology adopts a combined separation technology combining pressure swing adsorption and membrane separation, various components in the fuel gas can be more accurately separated, the purity of the product gas is improved, and high-quality raw materials are provided for subsequent production of high-added-value products.

Description

Technical Field

[0001] This utility model relates to the field of methanol synthesis fuel technology, and in particular to a device for the resource utilization of methanol synthesis fuel gas. Background Technology

[0002] The methanol synthesis process generates a large amount of fuel gas. Traditional treatment methods are often quite crude, with some of the fuel gas being directly emitted, resulting in energy waste and negative environmental impacts. Even when some is utilized, it is often simply burned as a low-value fuel, failing to fully exploit its potential value.

[0003] With the increasingly tense energy situation and ever-increasing environmental protection requirements, the in-depth resource utilization of methanol synthesis fuel gas has become an urgent problem to be solved. On the one hand, enterprises face pressure to reduce production costs and improve economic efficiency, and need to utilize the effective components in the fuel gas more efficiently. On the other hand, stringent environmental regulations prompt enterprises to reduce waste gas emissions and achieve green production. Therefore, the development of an innovative methanol synthesis fuel gas resource utilization device is of great practical significance. Thus, we propose a methanol synthesis fuel gas resource utilization device. Utility Model Content

[0004] The purpose of this invention is to provide a methanol synthesis fuel gas resource utilization device, which solves the existing problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A methanol synthesis fuel gas resource utilization device includes a fuel gas pipeline network, a fuel gas to gasification furnace gas-liquid separator, and a fuel gas to boiler gas-liquid separator. A portion of the fuel gas from the synthesis unit enters the flare pipeline network through a fuel gas to flare pipeline network regulating valve, while the remaining fuel gas enters the fuel gas pipeline network in two separate paths. One path of fuel gas from the fuel gas pipeline network sequentially passes through a fuel gas to gasification furnace shut-off valve, a fuel gas to gasification furnace gas-liquid separator, a fuel gas / liquefied petroleum gas (LPG) inlet gasification furnace regulating valve, and a fuel gas / LPG inlet gasification furnace pipeline before entering the gasification furnace for combustion and drying. The other path of fuel gas from the fuel gas pipeline network sequentially passes through a fuel gas to boiler shut-off valve, a fuel gas to boiler gas-liquid separator, a fuel gas inlet boiler regulating valve, and a fuel gas inlet boiler pipeline before entering the boiler for co-firing. A fuel gas to gasification furnace gas-liquid separator level control valve is installed at the lower part of both the fuel gas to gasification furnace and boiler gas-liquid separators.

[0007] As a further improvement to the above solution, a fuel gas pretreatment unit is included, which is connected to a fuel gas separation unit, a product conversion unit, and an energy recovery unit. The fuel gas pretreatment unit includes a dust removal module, a desulfurization module, and a dehydration module, with the desulfurization module connected to the dust removal module and the dehydration module connected to the desulfurization module. The fuel gas separation unit includes a pressure swing adsorption (PSA) module and a membrane separation module, with the PSA module connected to the dehydration module and the membrane separation module connected to the PSA module.

[0008] As a further improvement to the above scheme, the product conversion unit includes an ammonia synthesis reaction module and a methanol resynthesis module. The ammonia synthesis reaction module is connected to the membrane separation module, and the methanol resynthesis module is connected to the ammonia synthesis reaction module.

[0009] As a further improvement to the above solution, the energy recovery unit includes a waste heat recovery module and a pressure energy recovery module. The waste heat recovery module is connected to the methanol resynthesis module, and the pressure energy recovery module is connected to the waste heat recovery module.

[0010] As a further improvement to the above solution, the dust removal module is used for dust removal, the desulfurization module is used for desulfurization, and the dehydration module is used for dehydration.

[0011] As a further improvement to the above scheme, the pressure swing adsorption module is used to adsorb gas, and the membrane separation module is used to purify hydrogen.

[0012] As a further improvement to the above scheme, the ammonia synthesis reaction module is used to generate ammonia gas, and the methanol resynthesis module is used to synthesize methanol.

[0013] As a further improvement to the above solution, the waste heat recovery module is used to improve energy utilization efficiency, and the pressure energy recovery module is used to recover pressure energy.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This utility model discloses a methanol synthesis fuel gas resource utilization device. Through the coordinated work of multiple units such as pretreatment, separation and product conversion, the whole process of resource utilization of methanol synthesis fuel gas from purification to high value-added product conversion is realized, which significantly improves energy utilization efficiency and economic benefits.

[0016] This utility model discloses a methanol synthesis fuel gas resource utilization device. The combined separation technology adopts a combination of pressure swing adsorption and membrane separation, which can more accurately separate the components in the fuel gas, improve the purity of the product gas, and provide high-quality raw materials for the subsequent production of high value-added products.

[0017] This utility model discloses a methanol synthesis fuel gas resource utilization device, which includes a waste heat recovery and pressure energy recovery unit to recover and utilize the waste heat and pressure energy generated during the operation of the device in a tiered manner, thereby reducing the energy consumption of the device and conforming to the environmental protection concept of energy conservation and emission reduction. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural schematic diagram of a methanol synthesis fuel gas resource utilization device proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of the frame structure of a methanol synthesis fuel gas resource utilization device proposed in this utility model;

[0021] Figure 3 This is a schematic diagram of the frame structure of a methanol synthesis fuel gas resource utilization device proposed in this utility model;

[0022] Figure 4 This is a schematic diagram of the frame structure of a methanol synthesis fuel gas resource utilization device proposed in this utility model;

[0023] Figure 5 This is a schematic diagram of the frame structure of a methanol synthesis fuel gas resource utilization device proposed in this utility model;

[0024] Figure 6 This is a schematic diagram of the frame structure of a methanol synthesis fuel gas resource utilization device proposed in this utility model.

[0025] In the diagram: 1. Fuel gas pipeline; 2. Fuel gas to flare pipeline regulating valve; 3. Fuel gas to gasifier shut-off valve; 4. Fuel gas to gasifier gas-liquid separator; 5. Fuel gas to gasifier gas-liquid separator level control valve; 6. Liquefied petroleum gas pipeline; 7. Liquefied petroleum gas to gasifier shut-off valve; 8. Fuel gas / liquefied petroleum gas to gasifier regulating valve; 9. Fuel gas / liquefied petroleum gas to gasifier pipeline; 10. Fuel gas to boiler shut-off valve; 11. Fuel gas to boiler gas-liquid separator; 12. Fuel gas to boiler gas-liquid separator. 13. Level control valve; 14. Fuel gas inlet regulating valve; 15. Fuel gas inlet pipeline; 16. Fuel gas pretreatment unit; 17. Fuel gas separation unit; 18. Product conversion unit; 19. Energy recovery unit; 20. Dust removal module; 21. Desulfurization module; 22. Dehydration module; 23. Pressure swing adsorption module; 24. Membrane separation module; 25. Ammonia synthesis reaction module; 26. Methanol resynthesis module; 27. Waste heat recovery module; 28. Pressure energy recovery module. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.

[0028] Example 1

[0029] refer to Figure 1-5A methanol synthesis fuel gas resource utilization device includes a fuel gas pipeline network 1, a fuel gas to gasification furnace gas-liquid separator 4, and a fuel gas to boiler gas-liquid separator 11. A portion of the fuel gas from the synthesis unit enters the flare pipeline network through a fuel gas to flare pipeline network regulating valve 2, while the remaining fuel gas enters the fuel gas pipeline network 1 in two separate paths. After the fuel gas pipeline network 1, a fuel gas path sequentially passes through a fuel gas to gasification furnace shut-off valve 3, a fuel gas to gasification furnace gas-liquid separator 4, a fuel gas / liquefied petroleum gas inlet gasification furnace regulating valve 8, and a fuel... Gas / liquefied petroleum gas enters the gasifier through pipeline 9 and then enters the gasifier for combustion and drying. After fuel gas pipeline 1, another fuel gas line is set up to pass through the fuel gas to boiler shut-off valve 10, the fuel gas to boiler gas-liquid separator 11, the fuel gas to boiler regulating valve 13, and the fuel gas to boiler pipeline 14 before entering the boiler for co-firing. The lower part of the fuel gas to gasifier gas-liquid separator 4 is equipped with a fuel gas to gasifier gas-liquid separator level control valve 5. The lower part of the fuel gas to boiler gas-liquid separator 11 is equipped with a fuel gas to boiler gas-liquid separator level control valve 12.

[0030] In this embodiment, a fuel gas pretreatment unit 101 is included, which is connected to a fuel gas separation unit 102. The fuel gas separation unit 102 is connected to a product conversion unit 103, and the product conversion unit 103 is connected to an energy recovery unit 104. The fuel gas pretreatment unit 101 includes a dust removal module 105, a desulfurization module 106, and a dehydration module 107. The desulfurization module 106 is connected to the dust removal module 105, and the dehydration module 107 is connected to the desulfurization module 107. The fuel gas separation unit 102 includes a pressure swing adsorption module 108 and a membrane separation module 109. The pressure swing adsorption module 108 is connected to the dehydration module 7, and the membrane separation module 109 is connected to the pressure swing adsorption module 108.

[0031] In this embodiment, the product conversion unit 103 includes an ammonia synthesis reaction module 1010 and a methanol resynthesis module 1011. The ammonia synthesis reaction module 1010 is connected to the membrane separation module 109, and the methanol resynthesis module 11 is connected to the ammonia synthesis reaction module 1010.

[0032] In this embodiment, the energy recovery unit 104 includes a waste heat recovery module 1012 and a pressure energy recovery module 1013. The waste heat recovery module 1012 is connected to the methanol resynthesis module 1011, and the pressure energy recovery module 1013 is connected to the waste heat recovery module 1012.

[0033] In this embodiment, the dust removal module 105 is used for dust removal, the desulfurization module 106 is used for desulfurization, and the dehydration module 107 is used for dehydration. The dust removal module 105 uses a cyclone dust collector as the primary dust removal device, which uses the principle of centrifugal force to separate larger dust particles from the fuel gas. The cyclone dust collector has a simple structure, low cost, and high dust removal efficiency, and can effectively remove larger impurities from the fuel gas, reducing the burden on subsequent processing equipment. The desulfurization module 106 uses wet desulfurization technology, with an alkaline solution as the desulfurizing agent. When the fuel gas passes through the desulfurization tower, sulfur dioxide and other sulfur-containing compounds in it react chemically with the alkaline solution to generate substances such as sulfites or sulfates, thereby achieving the purpose of desulfurization. The desulfurization tower is equipped with multiple layers of spray devices and packing layers to increase the gas-liquid contact area and improve the desulfurization efficiency.

[0034] The dehydration module 107 utilizes the cooling and condensation principle to cool the fuel gas to below the dew point temperature through a shell-and-tube heat exchanger, causing the water vapor in it to condense into liquid water. The water is then separated out by a gas-liquid separator. The gas-liquid separator uses a combination of gravity settling and filtration to ensure the dehydration effect and prevent the water from having an adverse effect on subsequent processing steps.

[0035] In this embodiment, the pressure swing adsorption module 108 is used to adsorb gases, and the membrane separation module 109 is used to purify hydrogen. The pressure swing adsorption module 108 adopts multi-tower pressure swing adsorption technology, which utilizes the difference in adsorption capacity of the adsorbent for different gas molecules to achieve the separation of various components in the fuel gas under different pressure conditions. For example, activated carbon adsorbent preferentially adsorbs gases such as carbon dioxide and carbon monoxide, while hydrogen is discharged as unadsorbed product gas. By periodically changing the pressure of the adsorption tower, the regeneration of the adsorbent and the continuous production of product gas are achieved.

[0036] After the pressure swing adsorption module, the membrane separation module 109 adds a membrane separation device to further purify hydrogen. The membrane separation technology is based on the different permeation rates of different gas molecules in the membrane material to achieve gas separation. By selecting a hydrogen separation membrane with high selectivity and high throughput, such as a palladium alloy membrane, the purity of hydrogen can be improved to a higher level to meet the needs of subsequent high value-added product production.

[0037] In this embodiment, the ammonia synthesis reaction module 1010 is used to generate ammonia, and the methanol resynthesis module 1011 is used to synthesize methanol. The ammonia synthesis reaction module 1010 separates high-purity hydrogen and nitrogen, which can be separated by air and then reacted with a catalyst to synthesize ammonia. The ammonia synthesis reactor is a fixed-bed reactor, filled with an iron-based catalyst. By controlling parameters such as reaction temperature, pressure, and gas flow rate, hydrogen and nitrogen react chemically on the catalyst surface to generate ammonia. Ammonia is an important chemical raw material with high economic value.

[0038] The methanol resynthesis module 1011 mixes the separated carbon monoxide and carbon dioxide with some hydrogen and feeds it back into the methanol synthesis reactor for methanol resynthesis. The methanol synthesis reactor is a shell-and-tube reactor, with the tubes filled with a methanol synthesis catalyst, such as a copper-based catalyst. By optimizing the reaction conditions, the methanol synthesis efficiency is improved, the carbon element in the fuel gas is recycled, and the resource utilization rate is improved.

[0039] In this embodiment, the waste heat recovery module 1012 is used to improve energy utilization efficiency, and the pressure energy recovery module 13 is used to recover pressure energy. The waste heat recovery module 1012 generates a large amount of waste heat during the fuel gas pretreatment, separation and product conversion processes. This heat is recovered by using a waste heat boiler to heat water and generate steam. The steam can be used to drive a steam turbine to generate electricity, providing some power for the device itself, or used in other production processes that require steam, thereby improving energy utilization efficiency.

[0040] In processes involving pressure changes, such as pressure swing adsorption, the pressure energy recovery module 1013 is equipped with a pressure energy recovery device, such as a turbine expander. By utilizing the pressure energy during the gas depressurization process, the turbine expander is driven to rotate, which in turn drives a generator to generate electricity, thereby realizing the recovery and utilization of pressure energy and further reducing the energy consumption of the device.

[0041] The implementation principle of the methanol synthesis fuel gas resource utilization device in this application embodiment is as follows: When the gasifier does not need to be heated, the fuel gas to gasifier shut-off valve 3 and the fuel gas / liquefied petroleum gas inlet gasifier regulating valve 8 are closed; part of the fuel gas from the synthesis unit enters the flare network through the fuel gas to flare network regulating valve 2 to ensure the gas supply for the flare lamp, and the remaining fuel gas passes through the fuel gas network 1, the fuel gas to boiler shut-off valve 10, the fuel gas to boiler gas-liquid separator 11, the fuel gas inlet boiler regulating valve 13, and the fuel gas inlet boiler pipeline 14 in sequence to enter the boiler for co-firing; the fuel gas to boiler gas-liquid separator 11 is equipped with a fuel gas to boiler gas-liquid separator liquid level control valve 12 at the lower part, which is used to separate the fuel gas entering the boiler into liquid to ensure that the fuel gas does not carry liquid into the boiler, thereby improving the combustion completeness and stability of the fuel gas.

[0042] During the heating and warming process of the gasifier, the fuel gas inlet regulating valve 13 is gradually closed according to the fuel gas consumption of the gasifier. Part of the fuel gas from the synthesis unit enters the flare network through the fuel gas to flare network regulating valve 2 to ensure the gas supply for the flare lamp. The remaining fuel gas passes through the fuel gas network 1, the fuel gas to gasifier shut-off valve 3, the fuel gas to gasifier gas-liquid separator 4, the fuel gas / liquefied petroleum gas inlet regulating valve 8, and the fuel gas / liquefied petroleum gas inlet gasifier pipeline 9 to enter the gasifier for combustion and heating. The fuel gas to gasifier gas-liquid separator 4 is equipped with a fuel gas to gasifier gas-liquid separator level control valve 5 at the bottom. Its function is to separate the fuel gas entering the gasifier into liquid to ensure that the fuel gas does not carry liquid and improve the combustion completeness and stability of the fuel gas.

[0043] Install the following equipment in sequence: cyclone dust collector, desulfurization tower, heat exchanger, gas-liquid separator, pressure swing adsorption tower, membrane separation unit, ammonia synthesis reactor, methanol synthesis reactor, waste heat boiler, and turbine expander; ensure that the connecting pipes between each piece of equipment are securely installed and well-sealed to prevent gas leakage;

[0044] After the equipment is installed, a comprehensive system commissioning is carried out. Individual equipment is commissioned to check its operating status and ensure that it is operating normally. Then, linkage commissioning is carried out to simulate the actual production process and adjust the operating parameters of each unit to bring the equipment to its optimal operating state.

[0045] The raw material gas input introduces the fuel gas generated during the methanol synthesis process into the fuel gas pretreatment unit 101, where it undergoes dust removal, desulfurization, and dehydration treatment sequentially according to the predetermined process flow. During operation, parameters such as the flow rate, temperature, pressure, and concentration of various pollutants of the fuel gas are monitored in real time, and the operating parameters of the equipment are adjusted according to the actual situation to ensure the pretreatment effect.

[0046] The pretreated fuel gas enters the fuel gas separation unit 102, where hydrogen, carbon monoxide, carbon dioxide, and other components are separated by pressure swing adsorption and membrane separation technology. The separated gases then enter the product conversion unit 3 for ammonia synthesis and methanol resynthesis reactions. During the reaction process, reaction conditions such as temperature, pressure, and gas composition are strictly controlled to ensure product quality and yield.

[0047] During the operation of the device, the energy recovery unit 4 works synchronously; the waste heat boiler recovers waste heat to generate steam, and the turbine expander recovers pressure energy to generate electricity; the use of steam and electricity is rationally allocated to prioritize meeting the energy needs of the device itself, and excess energy can be transported to other production processes.

[0048] In the embodiments provided in this application, it should be understood that the disclosed systems, modules, and methods can be implemented in other ways. For example, the module embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between modules or units, and may be electrical, mechanical, or other forms.

[0049] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. This application is not limited to the exact structures described above and illustrated in the accompanying drawings, and it should not be considered that the specific implementation of this application is limited to these descriptions. For those skilled in the art, various changes and modifications made without departing from the concept of this application should be considered to fall within the protection scope of this application.

Claims

1. A methanol synthesis fuel gas resource utilization device, characterized in that, include: Fuel gas pipeline (1) and fuel gas pretreatment unit (101), fuel gas to gasifier gas-liquid separator (4), fuel gas to boiler gas-liquid separator (11); wherein, part of the fuel gas from the synthesis unit enters the flare pipeline through the fuel gas to flare pipeline regulating valve (2), and the remaining fuel gas enters the fuel gas pipeline (1) in two separate paths; after the fuel gas pipeline (1), one path of fuel gas is set up to pass through the fuel gas to gasifier shut-off valve (3), the fuel gas to gasifier gas-liquid separator (4), the fuel gas / liquefied petroleum gas inlet gasifier regulating valve (8), and the fuel gas / liquefied petroleum gas inlet gasifier pipeline (9) into the gasifier combustion oven; after the fuel gas pipeline (1), another path of fuel gas is set up to pass through the fuel gas to boiler shut-off valve (10) and the fuel gas to boiler gas-liquid separator (11). Separator (11), fuel gas inlet boiler regulating valve (13), and fuel gas inlet boiler pipeline (14) enter the boiler for co-firing; the lower part of the fuel gas to gasification furnace gas-liquid separator (4) is provided with a fuel gas to gasification furnace gas-liquid separator level control valve (5); the lower part of the fuel gas to boiler gas-liquid separator (11) is provided with a fuel gas to boiler gas-liquid separator level control valve (12); the fuel gas pretreatment unit (101) is connected to a fuel gas separation unit (102); the fuel gas separation unit (102) is connected to a product conversion unit (103); the product conversion unit (103) is connected to an energy recovery unit (104); the fuel gas pretreatment unit (101) includes a dust removal module (105), a desulfurization module (106), and a dehydration module (107).

2. The methanol synthesis fuel gas resource utilization device according to claim 1, characterized in that, The desulfurization module (106) is connected to the dust removal module (105), and the dehydration module (107) is connected to the desulfurization module (106). The fuel gas separation unit (102) includes a pressure swing adsorption module (108) and a membrane separation module (109). The pressure swing adsorption module (108) is connected to the dehydration module (107), and the membrane separation module (109) is connected to the pressure swing adsorption module (108).

3. The methanol synthesis fuel gas resource utilization device according to claim 2, characterized in that, The product conversion unit (103) includes an ammonia synthesis reaction module (1010) and a methanol resynthesis module (1011). The ammonia synthesis reaction module (1010) is connected to the membrane separation module (109), and the methanol resynthesis module (1011) is connected to the ammonia synthesis reaction module (1010).

4. The methanol synthesis fuel gas resource utilization device according to claim 3, characterized in that, The energy recovery unit (104) includes a waste heat recovery module (1012) and a pressure energy recovery module (1013). The waste heat recovery module (1012) is connected to the methanol resynthesis module (1011), and the pressure energy recovery module (1013) is connected to the waste heat recovery module (1012).

5. The methanol synthesis fuel gas resource utilization device according to claim 4, characterized in that, The dust removal module (105) is used for dust removal, the desulfurization module (106) is used for desulfurization, and the dehydration module (107) is used for dehydration.

6. The methanol synthesis fuel gas resource utilization device according to claim 5, characterized in that, The pressure swing adsorption module (108) is used to adsorb gas, and the membrane separation module (109) is used to purify hydrogen.

7. The methanol synthesis fuel gas resource utilization device according to claim 6, characterized in that, The ammonia synthesis reaction module (1010) is used to generate ammonia gas, and the methanol resynthesis module (1011) is used to synthesize methanol.

8. A methanol synthesis fuel gas resource utilization device according to claim 7, characterized in that, The waste heat recovery module (1012) is used to improve energy utilization efficiency, and the pressure energy recovery module (1013) is used to recover pressure energy.

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