Distributed biomass pretreatment factory green low-carbon off-grid power supply method

Abstract

The invention relates to the technical field of biomass gasification power generation, and particularly discloses a distributed biomass pretreatment factory green low-carbon off-grid power supply method, which comprises the following steps of: gasifying biomass briquettes or particles produced by a biomass pretreatment factory through a biomass gasification furnace to generate crude synthesis gas; tar, dust and the like in the crude synthesis gas are removed through a downstream purification device, the purified synthesis gas is sent to an internal combustion engine generator for power generation, power is supplied to equipment in a biomass pretreatment factory after power generation, tail gas of the internal combustion engine generator is connected to a waste heat boiler, and generated steam is used for driving the equipment in the biomass pretreatment factory. And the biomass pretreatment plant is completely not connected with the commercial power grid, so that off-grid green low-carbon power supply of the biomass pretreatment plant is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass gasification power generation, and in particular to a green and low-carbon off-grid power supply method for a distributed biomass pretreatment plant. Background Art

[0002] As global energy demand continues to grow, traditional fossil energy is gradually becoming depleted. The use of fossil energy leads to large amounts of carbon emissions, exacerbating global climate change. To address this issue, green fuel, as a renewable energy source, is considered an important alternative to traditional fossil fuels.

[0003] Traditional power supply methods in biomass pretreatment plants typically rely on external power grids, which presents challenges such as high costs and significant impacts on grid stability. Furthermore, the power generation process generates carbon emissions, which is inconsistent with low-carbon and environmentally friendly development requirements. Furthermore, existing biomass energy utilization processes suffer from inefficiencies and resource waste in the processing of biomass feedstock, purification of syngas, and comprehensive energy utilization.

[0004] Therefore, a green and low-carbon off-grid power supply method for distributed biomass pretreatment plants has become an urgent problem to be solved. Summary of the Invention

[0005] The purpose of the present invention is to provide a green and low-carbon off-grid power supply method for a distributed biomass pretreatment plant, so as to solve the problems existing in the power supply mode of the existing biomass pretreatment plant, realize zero-carbon off-grid power supply, improve the utilization efficiency of biomass energy, reduce production costs, and reduce dependence on the external power grid.

[0006] To achieve the above objectives, the present invention provides a technical solution: a green and low-carbon off-grid power supply method for a distributed biomass pretreatment plant, which specifically includes the following steps:

[0007] Biomass raw material processing and storage: Biomass raw materials enter the biomass pretreatment plant, and after processing, they become biomass molding materials and are stored in the biomass molding material warehouse.

[0008] Specifically, the biomass raw materials are conveyed to the drum screen via a conveyor after passing through a crusher in a biomass pretreatment plant. The biomass raw materials screened by the drum screen enter the biomass molding fuel machine via a closed belt conveyor to produce biomass molding materials.

[0009] The biomass molding materials produced by the biomass molding fuel machine are stored in a biomass molding material warehouse, most of which are transported to methanol and aviation fuel chemical parks, and a small part is transported to the biomass gasification furnace through a conveyor.

[0010] Furthermore, when the biomass raw material is conveyed to the drum screen via a conveyor after passing through the crusher, an iron remover is provided in the middle of the conveyor to remove iron particles mixed in the biomass raw material. The biomass raw material is preferably straw.

[0011] Biomass gasification: The biomass molding material is fed into the biomass gasifier through a conveyor. After being heated at high temperature in the biomass gasifier, the biomass molding material undergoes rapid pyrolysis and undergoes fuel gasification reaction with the gasifying agent to generate combustible gas raw synthesis gas and bottom ash. The bottom ash enters the slag cooler from the bottom of the biomass gasifier for cooling and then is discharged.

[0012] Crude syngas purification: After preliminary dust removal in the cyclone dust collector, the crude syngas enters the bottom of the scrubber. During the rising process of the syngas, it comes into sufficient countercurrent contact with the washing liquid sprayed from the scrubber, thereby washing and removing the dust in it.

[0013] Power generation: The cleaned gas after washing is discharged from the top of the scrubber and enters the electric tar collector to capture tar. The qualified cleaned synthesis gas enters the internal combustion generator to generate electricity.

[0014] Based on the power load of the biomass pretreatment plant, several internal combustion generators are modularly configured to generate power, with each generator generating power independently of the others. Depending on the power load of the biomass pretreatment plant, multiple internal combustion generators can supply power to the plant individually or simultaneously, or each generator can be independently and rapidly ramped up or down. The power generation capacity of a single internal combustion generator ranges from 0.5 to 1MW.

[0015] Waste heat utilization: The high-temperature flue gas discharged from the internal combustion generator enters the waste heat boiler for heat exchange to produce superheated steam. The superheated steam enters the biomass pretreatment plant to drive its internal equipment. The condensed water returns to the waste heat boiler, and the flue gas after heat exchange is discharged into the atmosphere through the chimney.

[0016] The advantages of the present invention compared with the prior art are:

[0017] (1) The present invention avoids line connection with the power grid, reducing line construction costs, line corridor area and power grid capacity costs.

[0018] (2) The present invention adopts internal combustion engine power generation technology, which can realize modular configuration of multiple units and has the characteristics of fast start and stop and fast load response.

[0019] (3) The system of the present invention is completely independent of the external power grid, which reduces the impact of changes in the biomass pretreatment plant system load on the power grid.

[0020] (4) The present invention realizes the combined use of electricity and steam to drive the equipment, thus maximizing the utilization of energy.

[0021] (5) The power generation of the system in the present invention is all from biomass gasification power generation, which is clean green electricity and reduces the carbon emissions of the overall project. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a process flow chart of a green and low-carbon off-grid power supply method for a distributed biomass pretreatment plant.

[0023] Figure 2 This is a diagram of the equipment layout within a biomass pretreatment plant.

[0024] As shown in the figure: 1. Biomass molding material storage, 2. Biomass gasification furnace, 3. Cyclone dust collector, 4. Slag cooler, 5. Scrubber, 6. Electric tar collector, 7. Internal combustion generator, 8. Waste heat boiler, 9. Biomass pretreatment plant, 10. Chimney. DETAILED DESCRIPTION

[0025] Various exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0026] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0027] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0028] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0029] The green and low-carbon off-grid power supply method for a distributed biomass pretreatment plant of the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] Combined with attachment Figure 1-2 The specific implementation process of the green and low-carbon off-grid power supply method for a distributed biomass pretreatment plant of the present invention is as follows:

[0031] The biomass raw materials enter the biomass pretreatment plant 9, and the biomass raw materials are conveyed to the drum screen after passing through the crusher in the biomass pretreatment plant 9. An iron remover is set in the middle of the conveyor to remove iron parts mixed in the raw materials. The straw (biomass raw materials) screened by the drum screen enters the biomass molding fuel machine through a closed belt conveyor. The produced biomass molding materials are stored in the biomass molding material warehouse 1 for the storage and transfer of biomass molding materials. Most of the biomass molding materials are transported to the methanol and aviation fuel chemical park, and a small amount of biomass molding materials are used for gasification fuel in the biomass gasification furnace 2.

[0032] The biomass molding material in the biomass molding material storage 1 is transported to the biomass gasification furnace 2 by a conveyor. After being heated at high temperature in the biomass gasification furnace 2, the biomass raw material undergoes rapid pyrolysis and undergoes a fuel gasification reaction with the gasification agent to generate a combustible gas, crude synthesis gas. The bottom slag enters the slag cooler 4 from the bottom of the biomass gasification furnace 2 for cooling and then is discharged.

[0033] The raw synthesis gas is initially dust-removed by the cyclone dust collector 3 and then enters the bottom of the scrubber 5. During the rising process of the synthesis gas, it is fully countercurrently contacted with the washing liquid sprayed from the scrubber 5, thereby washing and removing the dust therein.

[0034] The cleaned gas after washing is discharged from the top of the scrubber 5 and enters the electric tar collector 6 to capture tar. The qualified (the tar content that meets the import requirements of internal combustion engines is generally 20mg / Nm 3 The purified synthesis gas after filtration enters the internal combustion generator 7 (internal combustion generator 7 is a generator set) to generate electricity. The capacity of a single internal combustion generator 7 is between 0.5 and 1 MW, the frequency modulation rate of the internal combustion engine reaches 70-130% of the rated power / minute, the start-stop time is about 1-3 minutes, and the economic peak-shaving range can reach 20% to 100%. Depending on the power load of the biomass pretreatment plant 9, several internal combustion generators 7 can be modularly configured to generate electricity. Each internal combustion generator 7 generates electricity independently of each other. Depending on the power load of the biomass pretreatment plant 9, multiple internal combustion generators 7 can be used to supply power to the biomass pretreatment plant 9 individually or simultaneously, and each internal combustion generator 7 can also be independently and rapidly increased or decreased in load. The entire system can use a temporary generator to power the starting equipment during startup. During normal operation, the power is generated by the internal combustion engine, and no external supplementary power supply is required.

[0035] The high-temperature flue gas discharged by the internal combustion generator 7 enters the waste heat boiler 8 for heat exchange to generate superheated steam. The superheated steam enters the biomass pretreatment plant 9 to drive high-power equipment such as the biomass briquette fuel machine. The condensed water returns to the waste heat boiler 8, and the flue gas after heat exchange is discharged into the atmosphere through the chimney 10.

[0036] The biomass pretreatment plant 9 of the present invention houses a biomass gasifier 2, which gasifies the biomass molding material produced therein. The resulting biomass gasification gas is purified and then fed into an internal combustion generator 7. Multiple small internal combustion engine units combine to generate electricity and independently provide off-grid power, maintaining high efficiency even at minimal loads. The entire system is not connected to the grid and is powered entirely by the internal combustion generator 7, which offers rapid start / stop and load-variability, allowing for flexible deployment.

[0037] The power supply scheme of the present invention completely utilizes biomass gasification synthesis gas as fuel, thus realizing green power supply for the biomass pretreatment plant 9 .

[0038] The electrical equipment of the biomass pretreatment plant 9 is directly powered by the internal combustion generator 7, which completely separates the power consumption of the biomass pretreatment plant 9 from the power grid and realizes completely off-grid power supply.

[0039] The present invention adopts the internal combustion generator 7 to generate electricity, which can adapt to the frequent start and stop and variable load conditions of the biomass pretreatment plant 9, thereby improving the power supply reliability of the fuel base and the power plant biomass pretreatment plant 9.

[0040] The present invention uses an internal combustion generator 7 to generate electricity. The internal combustion generator 7 itself consumes little water for power generation and is suitable for biomass pretreatment plants 9 dispersed in rural areas and water-scarce areas.

[0041] The fuel used in the biomass gasification device comes from the biomass pellet fuel produced by the biomass pretreatment plant 9, which reduces the transportation of raw materials and reduces the cost of power generation. The remaining biomass pellets are used for gasification to synthesize green methanol or green aviation fuel.

[0042] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A green, low-carbon, off-grid power supply method for a distributed biomass pretreatment plant, characterized by: The following steps are involved: S1. Biomass raw materials enter the biomass pretreatment plant, are processed into biomass molding materials and stored in the biomass molding material storage; S2. The biomass molding material is fed into the biomass gasifier via a conveyor. After being heated at high temperature in the biomass gasifier, the biomass molding material undergoes rapid pyrolysis and reacts with the gasifying agent to generate a combustible crude synthesis gas and bottom ash. The bottom ash is cooled in a slag cooler from the bottom of the biomass gasifier and then discharged. S3, after preliminary dust removal in the cyclone dust collector, the raw syngas enters the bottom of the scrubber. During its ascent, the syngas comes into full countercurrent contact with the scrubbing liquid sprayed from the scrubber, thereby removing the dust in it; S4. The cleaned gas after washing is discharged from the top of the scrubber and enters the electric tar collector to capture tar. The qualified cleaned synthesis gas enters the internal combustion generator to generate electricity; S5. The high-temperature flue gas discharged from the internal combustion generator enters the waste heat boiler for heat exchange to produce superheated steam. The superheated steam enters the biomass pretreatment plant to drive its internal equipment. The condensed water returns to the waste heat boiler. The flue gas after heat exchange is discharged into the atmosphere through the chimney.

2. The green, low-carbon, off-grid power supply method for a distributed biomass pretreatment plant according to claim 1, characterized in that: The biomass raw materials are conveyed to the drum screen through a conveyor after passing through a crusher in a biomass pretreatment plant. After being screened by the drum screen, the biomass raw materials are conveyed to the biomass briquette fuel machine through a closed belt conveyor to produce biomass briquette.

3. The green, low-carbon, off-grid power supply method for a distributed biomass pretreatment plant according to claim 2, characterized in that: The biomass molding materials produced by the biomass molding fuel machine are stored in a biomass molding material storage warehouse, and part of the biomass molding materials are fed to the biomass gasification furnace through a conveyor.

4. The green, low-carbon, off-grid power supply method for a distributed biomass pretreatment plant according to claim 3, characterized in that: In the process of the biomass raw material being conveyed to the drum screen via a conveyor after passing through the crusher, an iron remover is provided in the middle of the conveyor to remove iron mixed in the biomass raw material.

5. The green, low-carbon, off-grid power supply method for a distributed biomass pretreatment plant according to claim 4, characterized in that: The biomass raw material is straw.

6. A green, low-carbon, off-grid power supply method for a distributed biomass pretreatment plant according to any one of claims 1 to 5, characterized in that: According to the power load of the biomass pretreatment plant, several internal combustion generators are modularly configured to generate electricity, and each generator generates electricity independently of each other; according to the power load of the biomass pretreatment plant, multiple internal combustion generators supply power to the biomass pretreatment plant individually or simultaneously, or each internal combustion generator can quickly increase or decrease the load individually.

7. A green, low-carbon, off-grid power supply method for a distributed biomass pretreatment plant according to claim 6, characterized in that: The power generation capacity of a single internal combustion generator is between 0.5-1MW.

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