Biomass gasification and new energy electrolysis hydrogen production coupled green alcohol production blending combustion system and method

Abstract

The invention provides a biomass gasification and new energy electrolysis hydrogen production coupled green alcohol production co-combustion system and method, and belongs to the technical field of coal power unit carbon reduction, and the system comprises a new energy power generation device used for generating electric energy; the water electrolysis hydrogen production device is used for generating H2 and O2 based on the water and the electric energy generated by the new energy power generation device; the biomass gasification device is used for gasifying biomass based on the air and O2 generated by the water electrolysis hydrogen production device to generate CO and H2; the methanol production device is used for generating methanol based on CO and H2 generated by the biomass gasification device and H2 generated by the water electrolysis hydrogen production device; and the hearth combustion device is used for carrying out blending combustion based on methanol generated by the methanol production device. According to the scheme, the carbon emission generated in the power generation process of the coal-fired power generation unit can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of carbon reduction of coal-fired power units, and specifically to a system and method for producing green alcohol by coupling biomass gasification with new energy electrolysis hydrogen production. Background Art

[0002] Biomass energy is considered a zero-carbon green fuel due to its renewability. Photovoltaic and wind power generation are also important green energy sources, and are currently important energy sources that replace non-fossil energy. In the process of generating electricity from coal-fired generators, fossil coal is burned to generate heat energy.

[0003] However, the carbon emissions from the combustion of fossil coal are relatively large. Therefore, how to reduce the carbon emissions generated during the power generation process of coal-fired power generation units has become an unresolved issue. Summary of the invention

[0004] The purpose of this application is to provide a biomass gasification and new energy electrolysis hydrogen production coupling green alcohol co-combustion system, which can solve the problem of large carbon emissions generated by fossil coal combustion in the prior art.

[0005] In a first aspect, the embodiment of the present application provides a biomass gasification and new energy electrolysis hydrogen production coupling green alcohol co-combustion system, the system comprising: New energy power generation device for generating electrical energy; Water electrolysis hydrogen production device, used to produce H2 and O2 based on water and electricity generated by new energy power generation device; Biomass gasification device, used to gasify biomass to produce CO and H2 based on air and O2 produced by water electrolysis hydrogen production device; A methanol production unit for producing methanol based on CO and H2 produced by a biomass gasification unit and H2 produced by a water electrolysis hydrogen production unit; A furnace combustion device for co-firing methanol produced in a methanol production plant.

[0006] In a possible implementation of the first aspect, the chemical equation for generating H2 and O2 by the water electrolysis hydrogen production device is as follows:

[0007] The reactants for hydrogen production by water electrolysis are , the product is and , the reaction condition is power on.

[0008] In a possible implementation of the first aspect, the chemical equation for producing CO and H2 by the biomass gasification device is as follows:

[0009] The reactants of biomass gasification are and biomass , the product is and .

[0010] In a possible implementation of the first aspect, the chemical equation for producing methanol in the methanol production device is as follows:

[0011] Among them, the reactants are and , the product is , the reaction conditions are catalyst and heating.

[0012] In a possible implementation manner of the first aspect, the system further includes a water supply device, and the water supply device is used to supply water to the water electrolysis hydrogen production device.

[0013] In a possible implementation manner of the first aspect, the biomass gasification device includes: a fluidized bed gasification device or a fixed bed gasification device.

[0014] In a possible implementation of the first aspect, the system further includes: a pressurizing device and a gas synthesis device; The pressurizing device is used to pressurize the gas synthesis device; the gas synthesis device is used to synthesize methanol.

[0015] In a possible implementation manner of the first aspect, the system further includes: a gas separation device and a gas rectification device; A gas separation device is used to separate methanol before selling; a gas distillation device is used to distill methanol before selling.

[0016] In a possible implementation of the first aspect, the system further includes a purity detection device, and the purity detection device is used to detect the purity of methanol when selling.

[0017] In a second aspect, the embodiment of the present application provides a method for producing green alcohol by coupling biomass gasification and new energy electrolysis hydrogen production, which is implemented based on the biomass gasification and new energy electrolysis hydrogen production coupling green alcohol co-combustion system of any one of the first aspects, and the method includes: Produce electricity based on renewable energy generation devices; Based on the water electrolysis hydrogen production device, water and electricity generated by the new energy power generation device are used to produce H2 and O2; Based on the biomass gasification device, the biomass is gasified using air and O2 produced by the water electrolysis hydrogen production device to produce CO and H2; Based on the methanol production device, CO and H2 produced by the biomass gasification device and H2 produced by the water electrolysis hydrogen production device are used to produce methanol; Based on the furnace combustion device, methanol produced by the methanol production device is used for blending.

[0018] In a possible implementation manner of the second aspect, the method further includes: The biomass is pretreated, the gasification gas is purified, the tar and impurities in the gasification gas are separated, and the tar and impurities are sent to the furnace combustion device for combustion.

[0019] The new energy power generation device in the present application generates electric energy, the water electrolysis hydrogen production device generates H2 and O2 based on water and the electric energy generated by the new energy power generation device, the biomass gasification device gasifies biomass based on air and the O2 generated by the water electrolysis hydrogen production device to produce CO and H2, the methanol production device produces methanol based on the CO and H2 generated by the biomass gasification device and the H2 generated by the water electrolysis hydrogen production device, and the furnace combustion device performs co-combustion based on the methanol produced by the methanol production device.

[0020] The methanol produced by the present application is a green fuel that can replace fossil coal consumption, reduce carbon emissions generated during the power generation process of coal-fired generator sets, and has strong ease of use and practicality.

[0021] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a structural schematic diagram of a biomass gasification and new energy electrolysis hydrogen production coupling green alcohol co-combustion system provided in an embodiment of the present application; Figure 2 It is a schematic diagram of the steps of the method for producing green alcohol by coupling biomass gasification with new energy electrolysis hydrogen production provided in the embodiment of the present application. DETAILED DESCRIPTION

[0024] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0025] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or photovoltaic components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, photovoltaic components and / or combinations thereof.

[0026] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0027] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] As used in this specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0029] In addition, in the description of the present application, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0030] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0031] Biomass energy is considered a zero-carbon green fuel due to its renewability. Photovoltaic and wind power generation are also important green energy sources, and are currently important energy sources that replace non-fossil energy. In the process of generating electricity from coal-fired generators, fossil coal is burned.

[0032] However, the carbon emissions from the combustion of fossil coal are relatively large. Therefore, how to reduce the carbon emissions generated during the power generation process of coal-fired power generation units has become an unresolved issue.

[0033] Photovoltaic power generation faces the main problem of not being able to be fully absorbed. The main reasons include: imbalance between electricity supply and demand (the maximum output period of distributed photovoltaics is at noon, while the maximum demand for electricity load is usually in the evening, which makes it difficult for photovoltaic power to be absorbed immediately on site), insufficient capacity of the distribution network (the design and operation of the traditional distribution network is based on the "one-way power supply" principle, while distributed photovoltaics need to be directly connected to the distribution network to form a two-way flow of electricity) and lack of an effective trading mechanism.

[0034] First, wind power generation is intermittent, volatile and random, which makes it very difficult to predict and dispatch wind power generation. Secondly, the mismatch between the construction and management of power grids and peak-shaving power sources and power source construction is also an important reason that hinders the consumption of wind power. Due to the insufficient construction of power grids and peak-shaving power sources, wind power cannot be delivered and consumed in time, resulting in serious wind abandonment. The imperfection of policies and market mechanisms is also an important factor that leads to the inability to consume wind power.

[0035] In response to the above-mentioned defects, an embodiment of the present application provides a biomass gasification and new energy electrolysis hydrogen production coupling green alcohol co-combustion system, in which the new energy power generation device generates electricity, the water electrolysis hydrogen production device generates H2 and O2 based on water and the electricity generated by the new energy power generation device, the biomass gasification device gasifies biomass based on air and O2 generated by the water electrolysis hydrogen production device to produce CO and H2, the methanol production device produces methanol based on the CO and H2 generated by the biomass gasification device and the H2 generated by the water electrolysis hydrogen production device, and the furnace combustion device performs co-combustion based on the methanol produced by the methanol production device.

[0036] The methanol produced by the present application is a green fuel that can replace fossil coal consumption, reduce carbon emissions generated during the power generation process of coal-fired generator sets, and has strong ease of use and practicality.

[0037] The specific process implemented by this application is introduced below through specific embodiments.

[0038] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of the biomass gasification and new energy electrolysis hydrogen production coupling green alcohol co-combustion system provided in the embodiment of the present application. Figure 1 As shown, the system includes: a new energy power generation device, a water electrolysis hydrogen production device, a biomass gasification device, a methanol production device and a furnace combustion device.

[0039] The new energy power generation device is used to generate electric energy, the water electrolysis hydrogen production device is used to generate H2 and O2 based on water and the electric energy generated by the new energy power generation device, and the biomass gasification device is used to gasify biomass based on air and O2 generated by the water electrolysis hydrogen production device to generate CO and H2.

[0040] The methanol production unit is used to produce methanol based on CO and H2 produced by the biomass gasification unit and H2 produced by the water electrolysis hydrogen production unit. The furnace combustion unit is used to blend and burn the methanol produced by the methanol production unit.

[0041] The furnace combustion device is a furnace burner. Green alcohol is fed into the furnace through an independent system and burned by a dedicated burner.

[0042] In some embodiments, electricity generated by renewable energy is used to electrolyze water to produce hydrogen and oxygen. The main products after biomass gasification are CO and H2, which are raw materials for producing methanol. The molar ratio of CO and H2 required for producing methanol is 1:2. The proportion of hydrogen in the gasification gas is insufficient, which is supplemented by electrolysis of hydrogen generated by renewable energy. Electrolytic oxygen is added to the air used for biomass gasification to improve the quality of gasification gas. The produced methanol can be sold or sent to thermal power units for combustion as fuel through burners, which is conducive to improving low-load stable combustion and peak regulation.

[0043] In some embodiments, biomass to methanol is usually produced by gasification in a gasifier to produce CO and H2, which are then hydrogenated and reacted under catalysis to produce methanol. The H2 produced by electrolyzing water using electricity generated by new energy sources is added to the gasified gas to make up for the lack of H2, and the O2 produced is added to the air used for gasification to form oxygen-rich gasification to improve the quality of the gasified gas. The produced methanol can be sold or blended, and the storage and transportation problems of hydrogen are solved at the same time. The sensible heat of the gasified gas cooling can be used in systems such as unit heat recovery.

[0044] According to one embodiment of the present application, the chemical equation for producing H2 and O2 by the water electrolysis hydrogen production device is as follows:

[0045] The reactants for hydrogen production by water electrolysis are , the product is and , the reaction condition is power on.

[0046] According to one embodiment of the present application, the chemical equation for the production of CO and H2 by a biomass gasification device is as follows:

[0047] The reactants of biomass gasification are and biomass , the product is and .

[0048] In some embodiments, biomass gasification also includes other chemical reactions such as the reaction of C and CO2, which are not listed here. Among them, the chemical equation for the reaction of C and CO2 is as follows:

[0049] Among them, the reactants are and biomass , the product is .

[0050] According to one embodiment of the present application, the chemical equation for producing methanol in a methanol production device is as follows:

[0051] Among them, the reactants are and , the product is , the reaction conditions are catalyst and heating. This reaction needs to be heated in the presence of a catalyst to effectively synthesize methanol.

[0052] According to one embodiment of the present application, the system further includes a water supply device, which is used to supply water to the water electrolysis hydrogen production device.

[0053] According to an embodiment of the present application, the biomass gasification device includes: a fluidized bed gasification device or a fixed bed gasification device.

[0054] According to an embodiment of the present application, the system further comprises: a pressurizing device and a gas synthesis device. The pressurizing device is used to pressurize the gas synthesis device. The gas synthesis device is used to synthesize methanol.

[0055] According to an embodiment of the present application, the system further comprises: a gas separation device and a gas rectification device. The gas separation device is used to separate the methanol when selling, and the gas rectification device is used to rectify the methanol when selling.

[0056] In some embodiments, if methanol is sold, in actual production, process steps such as gas compression, synthesis, gas separation and distillation are usually involved to ensure the purity and yield of the final product. These steps are not required when methanol is burned in a furnace.

[0057] According to an embodiment of the present application, the system further comprises a purity detection device, which is used to detect the purity of methanol when it is sold. The purity of methanol fed into the coal-fired unit for combustion can be relaxed and does not need to reach a very high purity.

[0058] See also Figure 2 , Figure 2 This is a schematic diagram of the steps of the method for producing green alcohol by coupling biomass gasification and new energy electrolysis hydrogen production provided in the embodiment of the present application. The method is implemented based on a system for producing green alcohol by coupling biomass gasification and new energy electrolysis hydrogen production. The method may include the following steps: S201, generating electric energy based on a new energy power generation device.

[0059] S202, based on the water electrolysis hydrogen production device, uses water and electricity generated by new energy power generation equipment to produce H2 and O2.

[0060] S203, based on the biomass gasification device, uses air and O2 produced by the water electrolysis hydrogen production device to gasify the biomass to produce CO and H2.

[0061] S204, based on a methanol production device, uses CO and H2 produced by a biomass gasification device and H2 produced by a water electrolysis hydrogen production device to produce methanol.

[0062] S205, based on a furnace combustion device, uses methanol produced by a methanol production device for blending.

[0063] It should be noted that the specific implementation principle of this embodiment has been described in the above embodiments and will not be repeated here.

[0064] According to one embodiment of the present application, the method further includes: pre-treating the biomass, purifying the gasification gas, separating the tar and impurities in the gasification gas, and sending the tar and impurities into a furnace combustion device for combustion.

[0065] In one embodiment, impurities separated during the gasification gas purification process can be sent to the furnace for local disposal and burned in the furnace.

[0066] In the embodiment of the present application, the biomass gasification and new energy electrolysis hydrogen production coupling green alcohol co-combustion system, the new energy power generation device generates electricity, the water electrolysis hydrogen production device generates H2 and O2 based on water and the electricity generated by the new energy power generation device, the biomass gasification device gasifies biomass based on air and O2 generated by the water electrolysis hydrogen production device to produce CO and H2, the methanol production device produces methanol based on the CO and H2 generated by the biomass gasification device and the H2 generated by the water electrolysis hydrogen production device, and the furnace combustion device performs co-combustion based on the methanol produced by the methanol production device.

[0067] The methanol produced by the present application is a green fuel that can replace fossil coal consumption, reduce carbon emissions generated during the power generation process of coal-fired generator sets, and has strong ease of use and practicality.

[0068] In addition, this application plan aims to solve the problem that electricity generated by new energy cannot be consumed in a timely manner. The transportation and use of hydrogen cannot be carried out on a large scale at present, resulting in idle waste caused by insufficient annual operating hours of new energy. It can consume and transform the electricity generated by wind power or photovoltaic (solar thermal) in a larger range to form green energy methanol.

[0069] This application scheme replaces fossil coal consumption with green fuels, achieves carbon reduction effects, increases the operating load rate of new energy, enriches product categories, and meets market demand.

[0070] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0071] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A biomass gasification and new energy electrolysis hydrogen production coupling green alcohol co-combustion system, characterized in that: The system comprises: New energy power generation device for generating electrical energy; A water electrolysis hydrogen production device, used to produce H2 and O2 based on water and the electricity generated by the new energy power generation device; A biomass gasification device, used to gasify biomass based on air and O2 produced by the water electrolysis hydrogen production device to produce CO and H2; A methanol production device for producing methanol based on the CO and H2 produced by the biomass gasification device and the H2 produced by the water electrolysis hydrogen production device; A furnace combustion device is used for co-firing the methanol produced by the methanol production device.

2. The biomass gasification and new energy electrolysis hydrogen production coupling green alcohol co-combustion system according to claim 1 is characterized in that: The chemical equation for producing H2 and O2 by the water electrolysis hydrogen production device is as follows: The reactants for hydrogen production by water electrolysis are , the product is and , the reaction condition is power on.

3. The biomass gasification and new energy electrolysis hydrogen production coupling green alcohol co-combustion system according to claim 1 is characterized in that: The chemical equation for the biomass gasification device to produce CO and H2 is as follows: The reactants of biomass gasification are and biomass , the product is and .

4. The biomass gasification and new energy electrolysis hydrogen production coupling green alcohol co-combustion system according to claim 1 is characterized in that: The chemical equation for producing methanol in the methanol production device is as follows: Among them, the reactants are and , the product is , the reaction conditions are catalyst and heating.

5. The biomass gasification and new energy electrolysis hydrogen production coupling green alcohol co-combustion system according to claim 1 is characterized in that: The system also includes a water supply device, which is used to supply water to the water electrolysis hydrogen production device.

6. The biomass gasification and new energy electrolysis hydrogen production coupled green alcohol co-combustion system according to any one of claims 1 to 5, characterized in that: The biomass gasification device includes: a fluidized bed gasification device or a fixed bed gasification device.

7. The biomass gasification and new energy electrolysis hydrogen production coupled green alcohol co-combustion system according to claim 1 is characterized in that: The system also includes: a pressurizing device and a gas synthesis device; The pressurizing device is used to pressurize the gas synthesis device; the gas synthesis device is used to synthesize methanol.

8. The biomass gasification and new energy electrolysis hydrogen production coupled green alcohol co-combustion system according to claim 7 is characterized in that: The system also includes: a gas separation device and a gas rectification device; The gas separation device is used to separate methanol before selling; the gas distillation device is used to distill methanol before selling.

9. The biomass gasification and new energy electrolysis hydrogen production coupled green alcohol co-combustion system according to claim 1 is characterized in that: The system also includes a purity detection device, which is used to detect the purity of methanol when it is sold.

10. A method for producing green alcohol by coupling biomass gasification with new energy electrolysis hydrogen production, characterized in that: The method is realized by coupling the biomass gasification and new energy electrolysis hydrogen production with the green alcohol co-combustion system according to any one of claims 1 to 9, and the method comprises: Produce electricity based on renewable energy generation devices; Based on the water electrolysis hydrogen production device, water and the electricity generated by the new energy power generation device are used to generate H2 and O2; Based on the biomass gasification device, the air and the O2 produced by the water electrolysis hydrogen production device are used to gasify the biomass to produce CO and H2; Based on a methanol production device, CO and H2 produced by the biomass gasification device and H2 produced by the water electrolysis hydrogen production device are used to produce methanol; Based on the furnace combustion device, the methanol produced by the methanol production device is used for blending.

11. The method for producing green alcohol by coupling biomass gasification with new energy electrolysis hydrogen production according to claim 10, characterized in that: The method further comprises: The biomass is pretreated, the gasification gas is purified, the tar and impurities in the gasification gas are separated, and the tar and impurities are sent to the furnace combustion device for combustion.

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