Biomass methanol production method and system for new energy fluctuation power supply

Abstract

The invention provides a biomass methanol production method and system for new energy fluctuation power supply, and the method comprises the following steps: (1) pretreating biomass to obtain biomass carbon; wherein a heat source for pretreatment comprises at least one of new energy power supply, flue gas and steam; (2) carrying out gasification treatment on the biomass carbon to obtain synthesis gas; (3) performing methanol synthesis treatment on the synthesis gas to obtain a methanol product, combustible tail gas and steam; (4) carrying out combustion exothermic treatment on the combustible tail gas to obtain flue gas; the preprocessing part serves as a flexible load in the whole system and bears the peak regulation effect of the micro-grid; the energy source needed by biomass pretreatment when new energy power generation output is insufficient is made up, the power supply stability of the micro-grid is improved, the configuration proportion of an energy storage system can be effectively reduced, the total project investment is reduced, and meanwhile surplus heat of methanol synthesis treatment is effectively recycled.

Description

Technical Field

[0001] The present invention belongs to the technical field of biomass chemical industry, and in particular relates to a biomass methanol production method and system for new energy fluctuating power supply. Background Art

[0002] At present, the process of producing methanol from biomass mainly relies on the heat generated by partial oxidation of biomass itself and fuel combustion. As a good carrier for green electricity consumption, green chemicals have developed rapidly in China in recent years.

[0003] However, at present, new energy power generation technology and chemical synthesis technology have both developed to maturity. However, how to resolve the contradiction between the volatility and randomness of new energy power generation and the high-load stable electricity demand of chemical synthesis is the difficulty and pain point that restricts the technical and economic feasibility of the project.

[0004] Therefore, in the process of producing green methanol from biomass, it is urgent to design a method that can absorb the volatility of renewable energy power generation. Summary of the invention

[0005] The present invention provides a biomass methanol production method and system for new energy fluctuating power supply, which is used to solve the problem in the prior art that the volatility and randomness of new energy power generation cannot meet the demand for stable electricity consumption in biomass methanol production.

[0006] In a first aspect, the present invention provides a biomass methanol production method for new energy fluctuating power supply, comprising the following steps: (1) pre-treating biomass to obtain biomass carbon; wherein the heat source of the pre-treatment includes at least one of renewable energy power supply, flue gas and steam; (2) gasifying biomass carbon to obtain synthesis gas; (3) subjecting the synthesis gas to methanol synthesis treatment to obtain methanol product, combustible tail gas and steam; (4) The combustible tail gas is subjected to a combustion and heat release treatment to obtain flue gas.

[0007] Compared with the prior art, the advantages of the present invention are as follows: the pretreatment part serves as a flexible load in the entire system and undertakes the peak-shaving function of the microgrid; the pretreatment can use the electric energy generated by new energy, the steam obtained from the methanol synthesis process, and the high-temperature flue gas after the combustion of combustible tail gas as energy sources, which makes up for the energy source required for biomass pretreatment when the output of new energy power generation is insufficient, improves the power supply stability of the microgrid, can effectively reduce the configuration ratio of the energy storage system, reduce the overall investment of the project, and effectively recycle and utilize the surplus heat of the methanol synthesis process.

[0008] Further, the pretreatment temperature is 170-190°C; and / or, The power range of renewable energy supply is 0-100% of the rated power; and / or, The temperature of the flue gas is 600~1800℃; and / or, The steam is saturated steam with a pressure of 2.0 to 4.0 MPa.

[0009] Further, when the pretreatment temperature is lower than 175°C and / or the power of the renewable energy power supply is lower than 90% of the rated power, the renewable energy power supply and the flue gas and / or steam are used as heat sources to participate in the pretreatment.

[0010] Furthermore, when the power of the renewable energy power supply is not less than 90% of the rated power, only the renewable energy power supply is used as a heat source to participate in the preprocessing.

[0011] Furthermore, the combustible tail gas includes at least one of the purge gas and the tail gas obtained by pressure swing adsorption hydrogen extraction.

[0012] Further, the temperature of the gasification treatment is 600-1800° C.; and / or, The temperature of methanol synthesis process is 240~320℃.

[0013] In a second aspect, the present invention provides a biomass methanol production system for new energy fluctuating power supply, which is used to execute the biomass methanol production method for new energy fluctuating power supply described in the first aspect, comprising a new energy power generation unit, a pretreatment unit, a gasification unit, a methanol synthesis unit, a gas storage unit and a combustion unit; The pretreatment unit includes a tube layer and a shell layer, and the shell layer is sleeved on the outside of the tube layer; The biomass is connected to the pipe layer inlet of the pretreatment unit, the new energy power generation unit is connected to the pipe layer of the pretreatment unit, the pipe layer outlet of the pretreatment unit is connected to the inlet of the gasification unit, the outlet of the gasification unit is connected to the inlet of the methanol synthesis unit, the product outlet of the methanol synthesis unit is used to output the methanol product, the steam outlet of the methanol synthesis unit is connected to the shell layer inlet of the pretreatment unit, the tail gas outlet of the methanol synthesis unit is connected to the inlet of the gas storage unit, the outlet of the gas storage unit is connected to the inlet of the combustion unit, and the outlet of the combustion unit is connected to the shell layer inlet of the pretreatment unit.

[0014] Further, it also includes an energy storage unit; The new energy power generation unit is also respectively connected to the gasification unit, the methanol synthesis unit and the energy storage unit.

[0015] Furthermore, the pipe layer of the pretreatment unit includes an electric heating module and a temperature measurement module; the new energy power generation unit is connected to the electric heating module and the temperature measurement module in the pipe layer.

[0016] Furthermore, the electric heating module includes at least two heating rods, and the power of the heating rods is not less than 500W. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a biomass methanol production system in one embodiment of the present invention.

[0018] Description of reference numerals: 1. New energy power generation unit; 2. Pretreatment unit; 3. Gasification unit; 4. Methanol synthesis unit; 5. Gas storage unit; 6. Combustion unit; 7. Energy storage unit. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In a first aspect, the present invention provides a biomass methanol production method for renewable energy fluctuating power supply, comprising the following steps: (1) pre-treating biomass to obtain biomass carbon; wherein the heat source of the pre-treatment includes at least one of renewable energy power supply, flue gas and steam; (2) gasifying biomass carbon to obtain synthesis gas; (3) subjecting the synthesis gas to methanol synthesis treatment to obtain methanol product, combustible tail gas and steam; (4) The combustible tail gas is subjected to a combustion and heat release treatment to obtain flue gas.

[0021] The present invention provides a biomass methanol production method for new energy fluctuating power supply, wherein the pretreatment part serves as a flexible load in the entire system and undertakes the peak-shaving effect of the microgrid; the pretreatment can use the electric energy generated by new energy, the steam obtained from the methanol synthesis process, and the high-temperature flue gas after the combustion of combustible tail gas as energy sources, which makes up for the energy source required for biomass pretreatment when the new energy power generation output is insufficient, improves the power supply stability of the microgrid, can effectively reduce the configuration ratio of the energy storage system, reduce the overall investment of the project, and effectively recycle and utilize the surplus heat of the methanol synthesis process.

[0022] Furthermore, the pretreatment temperature is 170~190°C; the power range of the new energy power supply is 0~100% of the rated power; the temperature of the flue gas is 600~1800°C; and the steam is saturated steam with a pressure of 2.0~4.0MPa.

[0023] In a specific embodiment, when the pretreatment temperature is lower than 175°C and / or the power of the new energy power supply is lower than 90% of the rated power, the new energy power supply and flue gas and / or steam are used as heat sources to participate in the pretreatment. At this time, the new energy power supply cannot meet the temperature requirements required for the pretreatment, and flue gas and / or steam are added as heat sources to participate in the pretreatment. By preferentially using flue gas and / or steam to provide supplementary heat energy for the pretreatment, the system power load is further reduced, and the peak load regulation function is realized, which can further improve the stability of the pretreatment heat supply and further improve the quality of the methanol product.

[0024] In another specific embodiment, when the power of the new energy power supply is not less than 90% of the rated power, only the new energy power supply is used as a heat source to participate in the pretreatment, which can meet the temperature required for the pretreatment, further improve the stability of the pretreatment heat supply, and further improve the quality of the methanol product obtained.

[0025] Specifically, the combustible tail gas includes at least one of the purge gas and the tail gas after the purge gas is treated by pressure swing adsorption and hydrogen extraction.

[0026] Optionally, the temperature of the gasification treatment is 600~1800°C; the temperature of the methanol synthesis treatment is 240~320°C.

[0027] Second, see Figure 1 The present invention provides a biomass methanol production system for new energy fluctuating power supply, which is used to implement the biomass methanol production method for new energy fluctuating power supply of the first aspect, including a new energy power generation unit 1, a pretreatment unit 2, a gasification unit 3, a methanol synthesis unit 4, a gas storage unit 5 and a combustion unit 6; The pretreatment unit 2 includes a tube layer and a shell layer, and the shell layer is sleeved on the outside of the tube layer; The biomass is connected to the pipe layer inlet of the pretreatment unit 2, the new energy power generation unit 1 is connected to the pipe layer of the pretreatment unit 2, the pipe layer outlet of the pretreatment unit 2 is connected to the inlet of the gasification unit 3, the outlet of the gasification unit 3 is connected to the inlet of the methanol synthesis unit 4, the product outlet of the methanol synthesis unit 4 is used to output the methanol product, the steam outlet of the methanol synthesis unit 4 is connected to the shell layer inlet of the pretreatment unit 2, the tail gas outlet of the methanol synthesis unit 4 is connected to the inlet of the gas storage unit 5, the outlet of the gas storage unit 5 is connected to the inlet of the combustion unit 6, and the outlet of the combustion unit 6 is connected to the shell layer inlet of the pretreatment unit 2.

[0028] In a specific embodiment, an energy storage unit 7 is also included; the new energy power generation unit 1 is also connected to the gasification unit 3, the methanol synthesis unit 4 and the energy storage unit 7 respectively.

[0029] Specifically, the pipe layer of the pre-processing unit 2 includes an electric heating module and a temperature measuring module; the new energy power generation unit 1 is connected to the electric heating module and the temperature measuring module in the pipe layer.

[0030] Furthermore, the electric heating module includes at least two heating rods, and the power of the heating rods is not less than 500W.

[0031] In a specific embodiment, the gas storage unit 5 is a gas storage cabinet, and the combustion unit 6 is a combustion heating furnace.

[0032] Hereinafter, a biomass methanol production method for new energy fluctuating power supply provided by the present invention is described in detail through specific embodiments. Example

[0033] This embodiment adopts Figure 1 The biomass methanol production system shown in the figure adopts the project site wind power curve to simulate the electric power signal of the whole system, and uses the common energy management and control system to control the energy storage and the power load of each unit. The pretreatment unit 2 adopts 3 heating rods with a power of 1500 watts to control the pretreatment temperature range to 180°C. The biomass carbon produced by the pretreatment unit 2 is ground and densely transported to the gasification unit 3. The synthesis gas produced by the gasification unit 3 is converted and purified and then sent to the methanol synthesis reactor to synthesize methanol. The exhaust gas obtained by the methanol synthesis reactor is sent to the gas storage cabinet as combustible tail gas.

[0034] When in use, firstly, a stable power supply is used to provide starting energy for the biomass methanol production system. After the system has been running stably for 1 hour, the stable power supply is switched to a power supply signal simulated according to the wind power curve. When the electric power drops to less than 90% of the rated power, the energy management and control system gives priority to reducing the power load of the pretreatment unit 2. At this time, the temperature of the pretreatment unit 2 begins to drop. When the temperature sensor detects a temperature lower than 175°C, the combustion heating furnace is started, and the flue gas volume is controlled by the temperature in the pretreatment unit 2. The temperature fluctuation range is controlled within the set temperature range of 180±10°C. When the electric power recovers, it gradually replaces the combustible exhaust combustion heating to meet the system operation requirements.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 replace some or all of the technical features therein by equivalents. If these modifications and variations fall within the scope of the claims of the present invention and their equivalent technologies, they should be considered to be within the protection scope of the present invention.

Claims

1. A biomass methanol production method for new energy fluctuating power supply, characterized in that: The following steps are involved: (1) pre-treating biomass to obtain biomass carbon; wherein the heat source of the pre-treatment includes at least one of renewable energy power supply, flue gas and steam; (2) gasifying biomass carbon to obtain synthesis gas; (3) subjecting the synthesis gas to methanol synthesis treatment to obtain methanol product, combustible tail gas and steam; (4) The combustible tail gas is subjected to a combustion and heat release treatment to obtain flue gas.

2. The biomass methanol production method using new energy fluctuating power supply according to claim 1 is characterized in that: The pretreatment temperature is 170-190°C; and / or, The power range of renewable energy supply is 0-100% of the rated power; and / or, The temperature of the flue gas is 600~1800℃; and / or, The steam is saturated steam with a pressure of 2.0 to 4.0 MPa.

3. The biomass methanol production method using new energy fluctuating power supply according to claim 1 is characterized in that: When the pretreatment temperature is lower than 175°C and / or the power of the renewable energy power supply is lower than 90% of the rated power, the renewable energy power supply and the flue gas and / or steam are used as heat sources to participate in the pretreatment.

4. The biomass methanol production method using new energy fluctuating power supply according to claim 1 is characterized in that: When the power of the renewable energy power supply is not less than 90% of the rated power, only the renewable energy power supply is used as a heat source to participate in the pretreatment.

5. The biomass methanol production method using new energy fluctuating power supply according to claim 1 is characterized in that: The combustible tail gas includes at least one of the purge gas and the tail gas after the purge gas is treated by pressure swing adsorption and hydrogen extraction.

6. The biomass methanol production method using new energy fluctuating power supply according to any one of claims 1 to 5, characterized in that: The temperature of the gasification treatment is 600-1800°C; and / or, The temperature of methanol synthesis process is 240~320℃.

7. A biomass methanol production system for new energy fluctuating power supply, used to implement the biomass methanol production method for new energy fluctuating power supply according to any one of claims 1 to 6, characterized in that: It includes a new energy power generation unit, a pretreatment unit, a gasification unit, a methanol synthesis unit, a gas storage unit and a combustion unit; The pretreatment unit includes a tube layer and a shell layer, and the shell layer is sleeved on the outside of the tube layer; The biomass is connected to the pipe layer inlet of the pretreatment unit, the new energy power generation unit is connected to the pipe layer of the pretreatment unit, the pipe layer outlet of the pretreatment unit is connected to the inlet of the gasification unit, the outlet of the gasification unit is connected to the inlet of the methanol synthesis unit, the product outlet of the methanol synthesis unit is used to output the methanol product, the steam outlet of the methanol synthesis unit is connected to the shell layer inlet of the pretreatment unit, the tail gas outlet of the methanol synthesis unit is connected to the inlet of the gas storage unit, the outlet of the gas storage unit is connected to the inlet of the combustion unit, and the outlet of the combustion unit is connected to the shell layer inlet of the pretreatment unit.

8. The biomass methanol production system for new energy fluctuating power supply according to claim 7 is characterized in that: Also includes an energy storage unit; The new energy power generation unit is also respectively connected to the gasification unit, the methanol synthesis unit and the energy storage unit.

9. The biomass methanol production system for new energy fluctuating power supply according to claim 8 is characterized in that: The pipe layer of the pretreatment unit includes an electric heating module and a temperature measuring module; the new energy power generation unit is connected with the electric heating module and the temperature measuring module in the pipe layer.

10. The biomass methanol production system for new energy fluctuating power supply according to claim 9, characterized in that: The electric heating module includes at least two heating rods, and the power of the heating rods is not less than 500w.

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