Biomass gas and natural gas dual-fuel heat supply system

Abstract

The invention discloses a biomass gas and natural gas dual-fuel heat supply system, which remarkably improves the reliability and stability of energy supply by simultaneously using biomass gas and natural gas, effectively deals with instability or shortage of single fuel supply, promotes diversification of an energy structure by virtue of renewability of the biomass gas, and improves the energy utilization rate. The system can reasonably adjust the mixing ratio of the two kinds of fuel, optimize the combustion process, reduce pollutant emission and achieve clean heat supply, meanwhile, according to biomass gas supply and natural gas price changes, the fuel structure is flexibly adjusted, the heat supply cost is reduced, and the energy consumption is reduced. A mixing proportion adjusting device of the mixed combustion module can achieve intelligent control, improve the combustion efficiency and reduce manual intervention and operation cost, and the heat exchange module efficiently transfers heat to a heat supply medium, improves the heat efficiency and reduces energy waste.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel heating, and particularly to a dual-fuel heating system of biomass gas and natural gas. Background Art

[0002] With the continuous growth of global energy demand and the increasingly prominent environmental problems, it has become an urgent task to find clean, efficient, and sustainable energy supply methods. Traditional fossil fuels, such as coal, oil, and natural gas, although meeting the energy demand to a certain extent, the large amounts of pollutants such as carbon dioxide, nitrogen oxides, and sulfur oxides generated during their combustion have caused serious damage to the environment, exacerbating global climate change and air pollution problems.

[0003] In this context, biomass gas, as a renewable energy source, has gradually attracted people's attention due to its advantages of cleanliness, low carbon, and renewability. Biomass gas is a combustible gas produced by the anaerobic fermentation of biomass raw materials (such as crop straws, forestry waste, livestock manure, etc.), mainly composed of methane, carbon dioxide, etc. Compared with natural gas, biomass gas produces fewer pollutants during combustion, and its raw material sources are extensive, enabling the resource utilization of waste, with good environmental and social benefits.

[0004] However, using only biomass gas or natural gas as the heating fuel has certain limitations. The calorific value of biomass gas is relatively low, and its supply stability is greatly affected by raw material sources and fermentation processes; while natural gas has a high calorific value and stable supply, but there may be problems of resource shortage or high price in some areas. Therefore, mixing biomass gas and natural gas for combustion to form a dual-fuel heating system has become a potential solution. Summary of the Invention

[0005] In view of this, the present invention proposes a dual-fuel heating system of biomass gas and natural gas, which realizes environmentally friendly, economical, and efficient heating effects through diversified energy utilization, intelligent control, and efficient heat exchange.

[0006] The technical solution of the present invention is realized as follows: A dual-fuel heating system of biomass gas and natural gas, comprising a biomass gas supply module, a natural gas supply module, a mixed combustion module, and a heat exchange module, wherein: The biomass gas supply module is used to generate and transport biomass gas to the mixed combustion module; The natural gas supply module is used to transport natural gas to the mixed combustion module; The mixing combustion module is provided with a mixing ratio adjusting device for adjusting the mixing ratio of biomass gas and natural gas, which is used to determine the mixing ratio of biomass gas and natural gas; The heat exchange module is used to transfer the heat generated by the combustion of the mixed fuel to the heating medium; The determination of the mixing ratio of biomass gas and natural gas, the specific calculation formula is: ; In the formula, R is the volume percentage of biomass gas in the mixed fuel, is the calorific value of biomass gas, is the combustion efficiency of biomass gas, is the calorific value of natural gas, is the combustion efficiency of natural gas.

[0007] As a further optional solution of the biomass gas and natural gas dual-fuel heating system, the biomass gas supply module includes a biomass raw material pretreatment device, a biomass gasifier and a biomass gas purification device, where: The biomass raw material pretreatment device is used to perform pretreatment of crushing and drying on the biomass raw material; The biomass gasifier is used to convert the pretreated biomass raw material into biomass gas; The biomass gas purification device is used to purify the biomass gas and remove impurities and harmful gases therein.

[0008] As a further optional solution of the biomass gas and natural gas dual-fuel heating system, the natural gas supply module includes a natural gas storage device, a natural gas pressure regulating device and a natural gas transmission pipeline, where: The natural gas storage device is used to store natural gas; The natural gas pressure regulating device is used to regulate the pressure of natural gas; The natural gas transmission pipeline is used to transport the natural gas with regulated pressure to the mixing combustion module; The regulation of the pressure of natural gas, the specific calculation formula is: ; In the formula, is the pressure after pressure regulation, is the initial pressure in the natural gas storage device, L is the length of the natural gas transmission pipeline, ρ is the density of natural gas, K is the pressure loss coefficient of the pipeline, A is the cross-sectional area of the pipeline.

[0009] As a further optional solution of the biomass gas and natural gas dual-fuel heating system, the hybrid combustion module further includes an ignition device and a combustion chamber, where: The ignition device is used to ignite the hybrid fuel; The combustion chamber provides a space for the combustion of the hybrid fuel; The mixing ratio adjustment device adjusts the mixing ratio by controlling the opening degrees of the intake valves of the biomass gas and natural gas.

[0010] As a further optional solution of the biomass gas and natural gas dual-fuel heating system, the hybrid combustion module adopts a staged combustion technology, divides the combustion chamber into multiple combustion zones, and realizes low nitrogen oxide emissions by controlling the fuel supply amount and air supply amount in different zones. Among them, the specific formula for determining the air supply amount is: ; In the formula, A ( x ) is the air supply amount at position x , is the basic air supply amount, is the temperature-air supply amount adjustment coefficient, T ( x ) is the temperature distribution of the combustion zone, is the average temperature of the combustion chamber. As a further optional solution of the biomass gas and natural gas dual-fuel heating system, the heat exchange module includes a heat exchanger and a heating medium circulation pipeline, where: The heat exchanger is used to realize the heat exchange between the heat generated by the combustion of the hybrid fuel and the heating medium; The heating medium circulation pipeline is used to circulate and transport the heating medium and transfer the heat to the heating area.

[0011] As a further optional solution of the biomass gas and natural gas dual-fuel heating system, the heat exchanger adopts a finned tube structure, and evaluates the enhanced heat transfer effect of the finned tube according to the geometric parameters of the finned tube. The specific evaluation formula is: ; In the formula, is the enhanced heat transfer effect, is the convective heat transfer coefficient with fins, is the convective heat transfer coefficient without fins, is the fin efficiency, is the fin height, is the root diameter of the fin, is the thermal conductivity of the fin material.

[0012] As a further optional solution of the biomass gas and natural gas dual-fuel heating system, the heating system further includes a fault alarm module, which is used to send out a fault alarm signal and display the fault location and type when the operating parameters of each module exceed the preset range.

[0013] As a further optional solution of the biomass gas and natural gas dual-fuel heating system, the heating system further includes an intelligent control module, which is used for users to remotely access the intelligent control module through the Internet, real-time understand the operating status of the heating system, and perform remote operation and control.

[0014] The beneficial effects of the present invention are as follows: By using both biomass gas and natural gas as fuels simultaneously, the system can flexibly cope with the situation of unstable or short supply of a single fuel, improving the reliability and stability of energy supply. The renewable nature of biomass gas helps to reduce the dependence on fossil fuels and promote the diversification of the energy structure. By reasonably adjusting the mixing ratio of biomass gas and natural gas, the combustion process can be further optimized, pollutant emissions can be reduced, and cleaner heating can be achieved. The system can flexibly adjust the fuel structure according to the supply situation of biomass gas and the price change of natural gas, and select a fuel combination with lower cost, thereby reducing the heating cost. The hybrid combustion module can give full play to the advantages of the two fuels and improve the combustion efficiency by adjusting the mixing ratio of biomass gas and natural gas. The hybrid combustion module is equipped with a mixing ratio adjustment device, which can automatically adjust the mixing ratio of biomass gas and natural gas according to actual needs to achieve intelligent control. This automatic control not only improves the operating efficiency of the system, but also reduces manual intervention and operating costs. The heat exchange module effectively transfers the heat generated by the combustion of the mixed fuel to the heating medium, improving the heat efficiency and reducing energy waste. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic diagram of the composition of a biomass gas and natural gas dual-fuel heating system of the present invention. Detailed Embodiments

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Reference Figure 1 , a dual-fuel heating system for biomass gas and natural gas, comprising a biomass gas supply module, a natural gas supply module, a mixed combustion module, and a heat exchange module, wherein: The biomass gas supply module is used to generate and transport biomass gas to the mixed combustion module; The natural gas supply module is used to transport natural gas to the mixed combustion module; The mixed combustion module is provided with a mixing ratio adjustment device for adjusting the mixing ratio of biomass gas and natural gas, and is used to determine the mixing ratio of biomass gas and natural gas; The heat exchange module is used to transfer the heat generated by the combustion of the mixed fuel to the heating medium; The determination of the mixing ratio of biomass gas and natural gas, the specific calculation formula is: ; In the formula, R is the volume percentage of biomass gas in the mixed fuel, is the calorific value of biomass gas, is the combustion efficiency of biomass gas, is the calorific value of natural gas, is the combustion efficiency of natural gas.

[0019] In this embodiment, by using both biomass gas and natural gas as fuels simultaneously, the system can flexibly cope with the situation of unstable or insufficient supply of a single fuel, improving the reliability and stability of energy supply. The renewability of biomass gas helps reduce the dependence on fossil fuels and promote the diversification of the energy structure. By reasonably adjusting the mixing ratio of biomass gas and natural gas, the combustion process can be further optimized, pollutant emissions can be reduced, and cleaner heating can be achieved. The system can flexibly adjust the fuel structure according to the supply situation of biomass gas and the price change of natural gas, and select a fuel combination with lower cost, thereby reducing the heating cost. The hybrid combustion module can give full play to the advantages of the two fuels and improve the combustion efficiency by adjusting the mixing ratio of biomass gas and natural gas. The hybrid combustion module is equipped with a mixing ratio adjustment device, which can automatically adjust the mixing ratio of biomass gas and natural gas according to actual needs to achieve intelligent control. This automatic control not only improves the operation efficiency of the system, but also reduces manual intervention and operating costs. The heat exchange module effectively transfers the heat generated by the combustion of the hybrid fuel to the heating medium, improving the thermal efficiency and reducing energy waste.

[0020] Preferably, the biomass gas supply module includes a biomass raw material pretreatment device, a biomass gasifier, and a biomass gas purification device, where: The biomass raw material pretreatment device is used for pretreating the biomass raw material by crushing and drying; The biomass gasifier is used for converting the pretreated biomass raw material into biomass gas; The biomass gas purification device is used for purifying the biomass gas to remove impurities and harmful gases therein.

[0021] In this embodiment, the biomass raw material pretreatment device crushes and dries the biomass raw material to make the raw material reach an appropriate particle size and moisture content, which helps improve the efficiency and stability of the subsequent gasification process and ensures that the biomass raw material can participate in the gasification reaction fully and evenly; the biomass gasifier converts the pretreated biomass raw material into biomass gas. By optimizing the gasification conditions and reaction process, the gasification efficiency and gas production are improved. This not only meets the demand for biomass gas in the heating system, but also improves the energy utilization efficiency of the whole system; the biomass gas purification device purifies the biomass gas and effectively removes impurities and harmful gases in the gas, such as tar, dust, sulfides, etc. This not only improves the cleanliness and combustion performance of biomass gas, but also reduces pollutant emissions during the combustion process, which is beneficial to environmental protection and air quality improvement; through the close cooperation of the three links of pretreatment, gasification, and purification, the operation of the whole biomass gas supply module is more stable and reliable. This reduces system failures or downtime caused by raw material problems, unstable gasification processes, or poor gas quality, ensuring the continuous and stable operation of the heating system.

[0022] Preferably, the natural gas supply module includes a natural gas storage device, a natural gas pressure regulating device, and a natural gas transmission pipeline, where: The natural gas storage device is used to store natural gas; The natural gas pressure regulating device is used to regulate the pressure of natural gas; The natural gas transmission pipeline is used to transport the natural gas with regulated pressure to the mixed combustion module; The formula for regulating the pressure of natural gas is specifically: ; In the formula, is the pressure after regulation, is the initial pressure in the natural gas storage device, L is the length of the natural gas transmission pipeline, ρ is the density of natural gas, K is the pressure loss coefficient of the pipeline, A is the cross-sectional area of the pipeline.

[0023] In this embodiment, the natural gas storage device can store a certain amount of natural gas to ensure that the system can still continuously and stably supply natural gas during demand fluctuations or supply interruptions, enhancing the reliability and stability of the entire heating system; the natural gas pressure regulating device is used to precisely regulate the pressure of natural gas to make it meet the requirements of the mixed combustion module. Through pressure regulation, it can ensure the best combustion effect when natural gas and biomass gas are mixed and burned, improving combustion efficiency and heating quality; the natural gas transmission pipeline transports the natural gas with regulated pressure to the mixed combustion module, ensuring the smooth transportation of natural gas. At the same time, by optimizing pipeline design and material selection, pressure loss and energy loss during transportation can be reduced, improving transportation efficiency; the pressure regulation calculation formula takes into account multiple factors such as the initial pressure in the natural gas storage device, the length of the natural gas transmission pipeline, the density of natural gas, the pressure loss coefficient of the pipeline, and the cross-sectional area of the pipeline, making the pressure regulation process more scientific and accurate, helping to achieve stable supply and efficient utilization of natural gas, enabling the natural gas supply module to flexibly adjust the supply volume and pressure of natural gas according to actual needs to adapt to the heating requirements under different working conditions. This flexibility helps to optimize the operation of the entire heating system and improve energy utilization efficiency.

[0024] Preferably, the mixed combustion module further includes an ignition device and a combustion chamber, where: The ignition device is used to ignite the mixed fuel; The combustion chamber provides a space for the combustion of the mixed fuel; The mixing ratio regulating device regulates the mixing ratio by controlling the opening degrees of the intake valves of biomass gas and natural gas.

[0025] In this embodiment, the ignition device is used to reliably ignite the mixed fuel, ensuring a rapid and stable start of the combustion process, which is crucial for the continuous operation of the heating system and avoids heating interruptions caused by ignition failures; the combustion chamber provides sufficient combustion space for the mixed fuel, enabling the fuel to burn fully, improving the combustion efficiency, and reducing the pollution of the environment by unburned fuel; the mixing ratio adjustment device can precisely adjust the mixing ratio of the two fuels by controlling the opening degrees of the intake valves of the biomass gas and natural gas. This flexibility allows the system to optimize the fuel structure according to actual needs, fuel supply conditions, or price changes, achieving economical and efficient heating; by precisely adjusting the mixing ratio, it can ensure that the biomass gas and natural gas reach the optimal combustion state in the combustion chamber, thereby improving the overall combustion efficiency, which not only reduces fuel consumption but also lowers the operating cost; by optimizing the combustion process and mixing ratio, it is possible to reduce pollutant emissions generated during the combustion process, such as nitrogen oxides, sulfur oxides, and particulate matter, which is of great significance for improving air quality and protecting the environment; this technical solution enables the mixed combustion module to adapt to different types and qualities of biomass gas and natural gas, enhancing the adaptability and robustness of the system.

[0026] Preferably, the mixed combustion module adopts the staged combustion technology, dividing the combustion chamber into multiple combustion zones, and achieving low nitrogen oxide emissions by controlling the fuel supply and air supply in different zones. Among them, the specific formula for determining the air supply is: ; In the formula, A ( x ) is the air supply at position x , is the basic air supply, is the temperature-air supply adjustment coefficient, T ( x ) is the temperature distribution of the combustion zone, is the average temperature of the combustion chamber.

[0027] In this embodiment, the staged combustion technology can optimize the combustion process by precisely controlling the supply of fuel and air in different combustion zones, reduce the formation of high-temperature oxygen-rich zones, thereby reducing the generation and emission of nitrogen oxides; by precisely controlling the supply of fuel and air in each combustion zone, it can ensure that the fuel burns under optimal conditions, improve the combustion efficiency, and reduce the loss of unburned fuel. This not only improves the energy utilization efficiency but also reduces the operating cost; the staged combustion technology makes the combustion process more stable and controllable, reduces safety hazards such as flame extinction and flashback caused by unstable combustion. At the same time, by adjusting the combustion conditions in different zones, it can adapt to different types and qualities of fuels, enhancing the adaptability and robustness of the system; the air supply determination formula takes into account the temperature distribution in the combustion zone and the average temperature of the combustion chamber, enabling the air supply to be dynamically adjusted according to changes in combustion conditions. This precise air supply control helps to achieve more efficient combustion and lower pollutant emissions; the staged combustion technology and the air supply determination formula enable the hybrid combustion module to flexibly adjust the combustion strategy and air supply according to actual demands, fuel supply conditions, or price changes. This flexibility helps to optimize the operation of the entire heating system, improve the energy utilization efficiency and economy. It should be noted that the x is the position coordinate of the combustion zone.

[0028] Preferably, the heat exchange module includes a heat exchanger and a heating medium circulation pipeline, where: The heat exchanger is used to achieve heat exchange between the heat generated by the combustion of the hybrid fuel and the heating medium; The heating medium circulation pipeline is used to circulate and transport the heating medium, transferring the heat to the heating area.

[0029] In this embodiment, as the core component, the heat exchanger can achieve efficient heat exchange between the heat generated by the combustion of the hybrid fuel and the heating medium. By optimizing the design and material selection of the heat exchanger, the heat exchange efficiency can be improved, heat loss can be reduced, and more heat can be ensured to be transferred to the heating medium; the heating medium circulation pipeline ensures that the heating medium can continuously and stably circulate and transport heat to the heating area. This circulation and transportation method enables the heating system to maintain a stable heating temperature, meet the heating demands of users, and improve the reliability and stability of heating; through efficient heat exchange and stable heating, this technical solution can reduce energy waste and the energy consumption of the heating system. At the same time, optimizing the design of the heat exchanger and the circulation pipeline also helps to reduce the system resistance and pumping energy consumption, further improving the energy utilization efficiency; by optimizing the heat exchange process and reducing the direct impact and corrosion of heat on the equipment, the service life of the heat exchanger and the heating medium circulation pipeline can be extended. At the same time, the stable heating conditions also help to reduce the stress generated by the equipment due to temperature fluctuations, further protecting the equipment safety.

[0030] Preferably, the heat exchanger adopts a finned-tube structure, and according to the geometric parameters of the finned tube, the enhanced heat transfer effect of the finned tube is evaluated. The specific evaluation formula is: ; In the formula, is the enhanced heat transfer effect, is the convective heat transfer coefficient with fins, is the convective heat transfer coefficient without fins, is the fin efficiency, is the fin height, is the root diameter of the fin, is the thermal conductivity of the fin material.

[0031] In this embodiment, the finned-tube structure expands the heat transfer area by adding fins, thus significantly improving the heat transfer efficiency of the heat exchanger. The presence of fins enables heat to be transferred to the heating medium more quickly, reducing the thermal resistance in the heat transfer process; through the specific evaluation formula, the enhanced heat transfer effect of the finned tube can be accurately calculated. This accurate evaluation helps to optimize the design parameters of the finned tube, such as fin height, fin efficiency, root diameter of the fin, and thermal conductivity of the fin material, etc., to further improve the heat transfer efficiency; each parameter in the evaluation formula provides clear guidance for fin design. By adjusting parameters such as fin height, efficiency, root diameter, and material thermal conductivity, the heat transfer performance of the finned tube can be optimized to better adapt to specific heating requirements; the finned-tube structure and accurate heat transfer evaluation together improve the energy utilization efficiency of the heat exchanger. By reducing heat loss and resistance in the heat transfer process, more heat can be effectively transferred to the heating medium, thus improving the energy utilization efficiency of the entire heating system; the finned-tube structure makes the heat exchanger more stable and reliable during the heat transfer process. The presence of fins increases the heat transfer area and also enhances the structural strength of the heat exchanger, reducing the risk of deformation and damage caused by thermal stress.

[0032] Preferably, the heating system further includes a fault alarm module. The fault alarm module is used to send a fault alarm signal and display the fault location and type when the operating parameters of each module exceed the preset range.

[0033] In this embodiment, the fault alarm module can monitor the operating parameters of each module in the heating system in real time, such as temperature, pressure, flow rate, etc. Once these parameters exceed the preset safety range, the module will immediately send out an alarm signal to alert the operator and prompt timely measures to avoid potential safety accidents. When a fault occurs in the system, the fault alarm module can quickly display the location and type of the fault, which helps the operator quickly locate the problem, reduce the fault troubleshooting time, and improve the maintenance efficiency. By promptly sending out the fault alarm signal and quickly locating the fault, the operator can quickly take measures for repair, thereby reducing the system downtime. The fault location and type information provided by the fault alarm module provides clear guidance for maintenance work, and the maintenance personnel can prepare the repair tools and materials accordingly, improving the efficiency and accuracy of the maintenance work.

[0034] Preferably, the heating system further includes an intelligent control module, which is used for the user to remotely access the intelligent control module through the Internet, to understand the operating status of the heating system in real time, and to perform remote operation and control.

[0035] In this embodiment, the user can access the intelligent control module through the Internet at any time and place, and view the operating parameters of the heating system in real time, such as temperature, pressure, flow rate, etc., so as to comprehensively understand the operating status of the system. Without the need to be on-site, the user can perform remote operation and control on the heating system through the intelligent control module, such as adjusting the temperature setting, opening and closing valves, etc., greatly improving the convenience and flexibility of use. The intelligent control module can monitor the operating status of the heating system in real time. Once an abnormality or fault is detected, it will immediately send a warning message to the user, and provide corresponding treatment suggestions or automatically take emergency measures, thereby effectively avoiding the occurrence or expansion of accidents. The intelligent control module also has a data backup and recovery function, which can regularly back up the operating data of the heating system and quickly recover it when needed to ensure the security and integrity of the data.

[0036] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A biomass gas and natural gas dual-fuel heating system, characterized in that, It includes a biomass gas supply module, a natural gas supply module, a mixed combustion module, and a heat exchange module, where: The biomass gas supply module is used to generate and transport biomass gas to the mixed combustion module; The natural gas supply module is used to transport natural gas to the mixed combustion module; The mixed combustion module is provided with a mixing ratio adjustment device for adjusting the mixing ratio of biomass gas and natural gas, and is used to determine the mixing ratio of biomass gas and natural gas; The heat exchange module is used to transfer the heat generated by the combustion of the mixed fuel to the heating medium; The determination of the mixing ratio of biomass gas and natural gas, the specific calculation formula is: ； In the formula, R is the volume fraction of biomass gas in the mixed fuel, is the calorific value of biomass gas, is the combustion efficiency of biomass gas, is the calorific value of natural gas, is the combustion efficiency of natural gas.

2. The biomass gas and natural gas dual-fuel heating system according to claim 1, wherein, The biomass gas supply module includes a biomass raw material pretreatment device, a biomass gasifier, and a biomass gas purification device, where: The biomass raw material pretreatment device is used to perform pretreatment of crushing and drying on the biomass raw material; The biomass gasifier is used to convert the pretreated biomass raw material into biomass gas; The biomass gas purification device is used to purify the biomass gas and remove impurities and harmful gases therein.

3. A biomass gas and natural gas dual-fuel heating system according to claim 2, characterized in that, The natural gas supply module includes a natural gas storage device, a natural gas pressure regulating device, and a natural gas transmission pipeline, where: The natural gas storage device is used to store natural gas; The natural gas pressure regulating device is used to adjust the pressure of natural gas; The natural gas transmission pipeline is used to transport the natural gas with adjusted pressure to the mixed combustion module; The adjustment of the pressure of natural gas, the specific calculation formula is: ； Wherein, is the pressure after pressure regulation, is the initial pressure in the natural gas storage device, L is the length of the natural gas transmission pipeline, ρ is the density of natural gas, K is the pressure loss coefficient of the pipeline, A is the cross-sectional area of the pipeline.

4. A biomass gas and natural gas dual-fuel heating system according to claim 3, wherein The mixed combustion module further includes an ignition device and a combustion chamber, where: The ignition device is used to ignite the mixed fuel; The combustion chamber provides a space for the combustion of the mixed fuel; The mixing ratio adjustment device adjusts the mixing ratio by controlling the opening degrees of the intake valves of biomass gas and natural gas.

5. A biomass gas and natural gas dual-fuel heating system according to claim 4, characterized in that, The mixed combustion module adopts a staged combustion technology, divides the combustion chamber into multiple combustion zones, and realizes low nitrogen oxide emissions by controlling the fuel supply amount and air supply amount in different zones. Among them, the specific formula for determining the air supply amount is: ； In the formula, A ( x ) is the air supply at position x , is the basic air supply, is the temperature-air supply adjustment coefficient, T ( x ) is the temperature distribution in the combustion zone, is the average temperature of the combustion chamber.

6. The dual-fuel heating system using biomass gas and natural gas according to claim 5, characterized in that The heat exchange module includes a heat exchanger and a heating medium circulation pipeline, where: The heat exchanger is used to realize the heat exchange between the heat generated by the combustion of the mixed fuel and the heating medium; The heating medium circulation pipeline is used to circulate and transport the heating medium and transfer the heat to the heating area.

7. A biomass gas and natural gas dual-fuel heating system according to claim 6, characterized in that, The heat exchanger adopts a finned tube structure, and evaluates the enhanced heat transfer effect of the finned tube according to the geometric parameters of the finned tube. The specific evaluation formula is: ； In the formula, To enhance the heat transfer effect, is the convective heat transfer coefficient with fins, is the convective heat transfer coefficient without fins, is the fin efficiency, is the fin height, is the root diameter of the fin, is the thermal conductivity of the fin material.

8. A biomass gas and natural gas dual-fuel heating system according to claim 7, characterized in that, The heating system further includes a fault alarm module. The fault alarm module is used to send a fault alarm signal and display the fault location and type when the operation parameters of each module are monitored to exceed the preset range.

9. A biomass gas and natural gas dual-fuel heating system according to claim 8, characterized in that, The heating system further includes an intelligent control module. The intelligent control module is used for users to remotely access the intelligent control module through the Internet, real-time understand the operation status of the heating system, and perform remote operation and control.

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