Method for collecting and utilizing combustible gas generated in charcoal production process

Abstract

The invention relates to the technical field of charcoal production, and discloses a method for collecting and utilizing combustible gas generated in the charcoal production process. The method comprises the steps that S1, in the wood heating process, wood is placed in a charcoal making furnace to be heated, the heating temperature is controlled, and combustible gas is generated by controlling the oxygen concentration in the furnace; s2, collecting the generated combustible gas through a closed gas collecting system, and guiding the gas to a lime kiln through a conveying pipeline; and S3, feeding the gas into the lime kiln, and mixing the gas with air for combustion through a combustor to ensure sufficient combustion and release of heat. Combustible gas generated in the charcoal production process is collected through the closed gas collecting system, the combustible gas is conveyed into the lime kiln to be combusted, the lime kiln is made to heat, decompose and calcine limestone through the combustible gas, and therefore the effect of collecting and recycling the combustible gas is achieved; meanwhile, the effect of reducing environmental pollution is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of charcoal production, in particular to a method for collecting and utilizing combustible gas generated in the process of charcoal production. Background Art

[0002] In the existing charcoal production technology, wood is usually heated to high temperature to decompose the organic matter in the wood to produce combustible gases. These gases are often directly discharged or not fully utilized, resulting in a large amount of energy waste and environmental pollution. Traditional technologies mostly rely on simple burners to burn these gases. However, during the combustion process, incomplete combustion is prone to occur due to improper control of the gas-air mixing ratio. This not only leads to energy waste, but also increases the emission of pollutants, causing a considerable burden on the environment.

[0003] In the existing charcoal production process, many open gas collection methods are used, which makes combustible gas easy to leak during the collection process. If a closed collection method is not adopted, it will not only cause gas waste, but also cause environmental pollution. The poor stability of the gas collection system makes it difficult to ensure the efficient use of gas in the production process.

[0004] Conventional burners are usually unable to accurately control the gas-air mixing ratio when processing these combustible gases. This unstable mixing ratio will lead to incomplete combustion, thereby reducing the release of heat and even producing harmful gases. For conventional burners, the precise control of the mixing ratio mostly relies on manual adjustment, which is prone to unstable combustion, thus affecting the efficient use of energy and environmental protection.

[0005] Existing waste gas heat recovery systems are generally inefficient, and in many cases the waste gas heat cannot be fully recovered and utilized. The heat exchange device in the prior art is complex in design and cannot efficiently transfer the heat in the waste gas to the part that needs to be heated. As a result, the waste of waste gas heat not only increases production costs, but also increases energy consumption. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides a method for collecting and utilizing combustible gas generated in the charcoal production process, which solves the problems of incomplete collection of combustible gas, inadequate combustion, low waste gas heat recovery efficiency and unstable pipeline temperature control in the production process.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for collecting and utilizing combustible gas generated during charcoal production, comprising the following steps; S1. During the wood heating process, the wood is placed in a charcoal making furnace and heated to control the heating temperature, and combustible gas is generated by controlling the oxygen concentration in the furnace; S2, collect the generated combustible gas through a closed gas collection system and guide the gas through a delivery pipeline - lime kiln; S3, the gas is sent into the lime kiln and mixed with air through the burner to ensure full combustion and release heat; S4. Recover the waste gas heat generated during the combustion process through the waste gas heat recovery system and collect the heat through a heat exchanger; S5. The heat collected by the heat exchanger is used to heat the delivery pipeline to maintain the temperature of the combustible gas.

[0008] Preferably, in step S1, an automatic temperature control system is used to accurately control the temperature in the furnace to ensure that the temperature of the wood is maintained within the range of 600°C-700°C.

[0009] Preferably, in step S1, the combustible gas is generated in the furnace by controlling the oxygen concentration, and the oxygen concentration is controlled within a range of 0%-10%.

[0010] Preferably, the closed gas collection system in step S2 includes a gas collection container, a gas flow meter, and a gas pressure sensor.

[0011] Preferably, the burner in step S3 is a recirculation burner, which can automatically adjust the gas-air mixing ratio during the combustion process and adjust the combustion temperature through a feedback system.

[0012] Preferably, in step S3, the burner controls the mixing ratio of gas and air through an automatic adjustment system to ensure that the mixing ratio during the combustion process is 1:5-1:10.

[0013] Preferably, the combustion temperature of the mixed gas in step S3 is 1000°C-1200°C.

[0014] Preferably, the exhaust gas heat recovery system in step S4 includes a heat exchanger, a heat pipe system and a thermal energy storage device to effectively recover and store the heat in the exhaust gas.

[0015] Preferably, in step S5, the exhaust gas heat collected by the heat exchanger is used to heat the delivery pipeline, and the temperature of the combustible gas in the pipeline is maintained between 500°C and 600°C.

[0016] Preferably, the closed gas collection system in step S2 is made of high temperature resistant and corrosion resistant materials, specifically aluminum alloy, to ensure that the combustible gas does not leak during the transmission process and can withstand long-term use of high temperature gas.

[0017] The present invention provides a method for collecting and utilizing combustible gas generated during charcoal production. It has the following beneficial effects: 1. The present invention collects the combustible gas generated in the charcoal production process by adopting a closed gas collection system, and transports the combustible gas to the inside of the lime kiln for combustion, so that the lime kiln utilizes the combustible gas to heat, decompose and calcine the limestone, thereby achieving the effect of collecting and utilizing the combustible gas and reducing environmental pollution.

[0018] 2. The present invention adopts a recirculation burner and accurately controls the mixing ratio of gas and air through an automatic adjustment system to ensure the fullness and stability of the combustion process. Compared with traditional burners, this technical solution can avoid the problem of incomplete combustion, optimize heat release, improve heat utilization, and avoid the energy waste and incomplete combustion caused by uneven mixing in the past.

[0019] 3. The present invention recovers the waste gas heat generated during the combustion process through the waste gas heat recovery system, and collects the heat through the heat exchanger. This solution significantly improves the energy utilization efficiency. Compared with the problem of failure to effectively utilize the waste gas heat in the prior art, the present invention fully recovers and reuses the heat in the waste gas, transfers the recovered heat to the delivery pipeline through the heat exchanger, maintains the stable temperature of the gas in the pipeline, effectively avoids the risk of gas condensation or over-temperature, and ensures the stable operation and sustainability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0022] Please see attached Figure 1 , an embodiment of the present invention provides a method for collecting and utilizing combustible gas generated during charcoal production, comprising the following steps; S1. During the wood heating process, the wood is placed in a charcoal making furnace and heated to control the heating temperature, and combustible gas is generated by controlling the oxygen concentration in the furnace; Specifically, in this embodiment, during the wood heating process, the wood needs to be heated to a desired temperature range through a precise temperature control system. Usually, the temperature range is controlled between 600°C and 700°C. Within this temperature range, the wood will produce combustible gas through pyrolysis reaction. During this process, the organic matter in the wood will decompose and release a series of combustible gases, including methane, ethylene, propylene, carbon dioxide and water vapor.

[0023] In terms of temperature control, an automatic temperature control system is used to ensure that the temperature in the furnace is within the specified range. Generally, the automatic temperature control system consists of multiple temperature sensors and feedback adjustment devices, which adjust the output power of the heating device by monitoring the temperature changes in the furnace in real time. Specifically, when the temperature is too low, the system will automatically increase the heating power to ensure that the temperature reaches between 600℃ and 700℃ as soon as possible; when the temperature is too high, the system will reduce the heating power to prevent overheating from affecting the quality of the wood or excessive consumption of combustible gas. In this way, the wood is ensured to undergo pyrolysis reaction at the optimal temperature, thereby increasing the yield and quality of the combustible gas.

[0024] During the heating process, in order to improve the efficiency of gas generation and optimize the quality of the gas, an oxygen-deficient environment is also used in this embodiment. Specifically, the oxygen-deficient environment is achieved by adjusting the oxygen concentration in the furnace, and the oxygen concentration is controlled between 0% and 10%. Within this oxygen concentration range, the pyrolysis reaction of the wood can proceed smoothly, while avoiding too much oxygen from entering the furnace, thereby causing oxidation reactions of some gases and affecting the quality and quantity of the combustible gas. As an option, the oxygen concentration in the furnace can be adjusted by a precise oxygen supply system, which can automatically adjust the oxygen supply according to the changes in the oxygen concentration in the furnace to ensure that the furnace is always in a suitable oxygen-deficient state.

[0025] The wood heating process in step S1 ensures the efficient generation of combustible gas during the wood heating process through the coordinated work of the precise temperature control system and the oxygen concentration control system. By controlling the temperature within the range of 600℃-700℃ and the oxygen concentration within the range of 0%-10%, the wood is heated under the charcoal making furnace to carbonize the wood, which can maximize the yield and quality of combustible gas while optimizing the wood distillation reaction. This control method not only improves production efficiency, but also ensures the quality of charcoal, meeting the needs of industrial production.

[0026] S2, collect the generated combustible gas through a closed gas collection system and guide the gas through a delivery pipeline - lime kiln; Specifically, in step S1, the wood is precisely heated and decomposed in an oxygen-deficient environment to generate combustible gases. These generated combustible gases need to be efficiently and stably collected and transported to the next step, namely the combustion process in the lime kiln. In this embodiment, step S2 specifically involves how to collect these combustible gases through a closed gas collection system and guide the gases through a delivery pipeline to the lime kiln for further processing.

[0027] In this embodiment, the design of the closed gas collection system is very critical, which can ensure that the generated combustible gas will not leak during the entire collection and transportation process, and the collection process is efficient and stable. Generally, the closed gas collection system is composed of multiple key components, including a gas collection container, a gas flow meter, and a gas pressure sensor.

[0028] During the gas collection process, first, all the generated combustible gases will flow into the gas collection container through the gas outlet in the furnace. The gas collection container needs to have sufficient volume to accommodate the large amount of combustible gases released during the wood heating process. Generally, the collection container should be made of high temperature and corrosion resistant materials to ensure its stability and safety in a long-term high temperature environment.

[0029] During the gas collection process, a gas flow meter is also needed to monitor the gas flow to ensure that the flow of combustible gas remains stable during the collection and transmission process. Gas flow meters are usually installed at the inlet or outlet of the gas pipeline. By monitoring the gas flow in real time, they can provide important data support for the subsequent transportation process.

[0030] In this embodiment, the gas delivery pipeline also has the characteristics of high temperature resistance and corrosion resistance, and the material of the pipeline should be able to withstand long-term high temperature and corrosive environment. Generally, the delivery pipeline can be made of stainless steel pipes, alloy steel pipes or other materials coated with high temperature resistant coatings. These pipeline materials can ensure that there is no leakage during gas transmission, and at the same time can avoid damage to the pipeline itself due to temperature fluctuations.

[0031] The closed gas collection system in step S2 can ensure the stability, safety and efficiency of the combustible gas during the collection and transportation process through efficient gas collection containers, accurate gas flow meters and gas pressure sensors, and high-temperature and corrosion-resistant transportation pipelines. This technical solution ensures the smooth transition of gas from the wood heating stage to the lime kiln, providing high-quality combustible gas for the subsequent combustion process. This design not only improves production efficiency, but also optimizes energy utilization and avoids gas waste.

[0032] S3, the gas is sent into the lime kiln and mixed with air through the burner to ensure full combustion and release heat; Specifically, in step S2, the combustible gas of the lime kiln is accurately collected and transported and is ready for combustion. Next, step S3 involves mixing the combustible gas with air and fully burning it in the burner in the lime kiln to release the necessary heat for the lime calcination process. In this embodiment, the key to this step is how to ensure efficient and complete combustion through a reasonable gas-air mixing ratio and accurate combustion temperature control.

[0033] In this embodiment, the mixing process of gas and air is carried out by a burner in the lime kiln. The burner adopts a reflow burner, which is a device that can effectively mix gas and air and control the combustion temperature. The working principle of the reflow burner is to mix the combustible gas from the gas delivery pipeline with air in a predetermined ratio and then send it into the lime kiln for combustion. Compared with the traditional burner, the reflow burner can effectively avoid gas waste during the combustion process and ensure that the mixed gas is fully burned.

[0034] The mixing ratio of gas to air needs to be adjusted according to the actual production situation to ensure the stability and efficiency of combustion. In this embodiment, the mixing ratio of gas to air is usually controlled between 1:5-1:10. Within this mixing ratio range, the gas can fully contact with the air and burn quickly in the burner, thereby releasing the required heat. It should be noted that too high or too low a gas to air ratio will affect the efficiency and stability of combustion, and may even lead to incomplete combustion or energy waste.

[0035] Specifically, during the mixing process of gas and air, the air flow rate and gas flow rate are precisely adjusted to ensure that the combustion temperature of the mixed gas can be controlled between 1000℃ and 1200℃. This temperature range not only helps to ensure the full combustion of the gas, but also releases enough heat for the calcination process of lime. According to the combustion requirements, the temperature control system can automatically increase or decrease the ratio of gas to air to keep the combustion temperature stable.

[0036] In order to ensure the stability of the combustion temperature, the burner is equipped with a temperature control system, which adjusts the air flow and the supply of combustible gas by real-time monitoring of the temperature sensor data. When the temperature approaches the upper limit, the system will automatically reduce the gas flow and reduce the combustion intensity; conversely, when the temperature is too low, the system will increase the gas flow to ensure a continuous and stable combustion process.

[0037] The gas and air mixed combustion process in step S3 ensures high efficiency and stability of combustion with the help of a recirculation burner and precise temperature. Through the precise control of a reasonable gas and air mixing ratio and a temperature range, the combustion process can be ensured to be complete, releasing enough heat for the calcination of lime, while also avoiding incomplete combustion or heat loss. Further automated control systems not only improve the stability of the entire system, but also reduce errors in human operation, ensuring the best performance of the combustion process.

[0038] S4. Recover the waste gas heat generated during the combustion process through the waste gas heat recovery system and collect the heat through a heat exchanger; Specifically, in the aforementioned step S3, the fully burned gas releases a large amount of heat, which is not only important for the calcination process in the lime kiln, but can also be used to improve the overall energy efficiency of the system. In order to make full use of the heat in the exhaust gas, the present invention designs an exhaust gas heat recovery system. The system can efficiently recover the exhaust gas heat generated during the combustion process and transfer it to the part that needs to be heated through a heat exchanger.

[0039] In this embodiment, the core components of the exhaust gas heat recovery system include a heat exchanger, a heat pipe system, and a thermal energy storage device. The heat exchanger is used to recover heat from the exhaust gas, and the heat pipe system helps to transfer the recovered heat to the thermal energy storage device. In this process, the heat of the exhaust gas is recovered and conducted at multiple stages, ultimately achieving the effect of efficient utilization. The heat in the exhaust gas can not only improve the thermal efficiency of the system when passing through the heat exchanger, but also reduce the overall energy consumption.

[0040] Specifically, the exhaust gas first enters through the air inlet of the heat exchanger, and multiple heat exchange channels are set inside the heat exchanger, which exchange heat with the cooling medium (such as water or air) flowing through the system. Through this process, the heat in the exhaust gas is transferred to the cooling medium and further stored or used to heat other system components.

[0041] The heat pipe system is a key component that connects the heat exchanger and the thermal energy storage device. The design of the heat pipe is based on the principle of heat conduction, which can transfer the heat recovered from the exhaust gas to the thermal energy storage device. By adopting a multi-stage heat pipe system, the heat in the exhaust gas can be quickly transferred and stored centrally, providing a stable heat source for subsequent heating needs.

[0042] The exhaust gas heat recovery system in this embodiment achieves efficient recovery and reuse of exhaust gas heat through a carefully designed heat exchanger, heat pipe system and thermal energy storage device. The system can significantly improve energy utilization efficiency, reduce energy consumption in the production process, and reduce environmental pollution. At the same time, through the optimization and adjustment of the intelligent control system, the exhaust gas heat recovery system can flexibly adapt to the needs of different production conditions and provide a stable and continuous heat source for the overall system.

[0043] S5. The heat collected by the heat exchanger is used to heat the delivery pipeline to maintain the temperature of the combustible gas; Specifically, in the aforementioned step S4, the exhaust gas heat recovery system has recovered and stored the exhaust gas heat generated during the combustion process through the heat exchanger. This heat can not only be used to increase the working temperature of the lime kiln, but also heat the delivery pipeline through the heat exchanger, thereby ensuring that the gas maintains a suitable temperature during the delivery process, avoiding the subsequent combustion process being affected by the low gas temperature.

[0044] In this embodiment, the recovered waste gas heat is transferred through the heat exchanger to the delivery pipeline, the main purpose of which is to ensure that the gas temperature in the pipeline is maintained within a suitable range. Generally, the gas temperature in the pipeline should be maintained between 500°C and 600°C. This temperature range can ensure that the gas will not condense or lose heat due to low temperature during transportation, and also avoid affecting the stability of the pipeline material or causing unnecessary energy consumption of the system due to high temperature.

[0045] The temperature in the pipeline should be kept between 500℃ and 600℃. This temperature range helps ensure the stability and combustion efficiency of the combustible gas during transportation. Too low a temperature may cause gas condensation or even poor gas flow in the pipeline; while too high a temperature will increase the heat loss of the pipeline and reduce the overall efficiency of the system. Through proper temperature control, ensure that the gas in the pipeline is always in the optimal temperature range.

[0046] In step S5 of this embodiment, the heat in the exhaust gas is effectively transferred to the delivery pipeline through the heat exchanger, ensuring that the temperature of the gas in the pipeline is always kept within a stable range, thereby avoiding adverse effects on the gas transportation process due to too low or too high temperature. Through efficient heat exchangers, precise temperature control systems and reasonable pipeline design, energy utilization efficiency can be maximized, energy consumption of the system can be reduced, and the stability and safety of the overall production process can be improved.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for collecting and utilizing combustible gas generated during charcoal production, characterized in that: The steps include: S1. During the wood heating process, the wood is placed in a charcoal making furnace and heated to control the heating temperature, and combustible gas is generated by controlling the oxygen concentration in the furnace; S2, collect the generated combustible gas through a closed gas collection system and guide the gas through a delivery pipeline - lime kiln; S3, the gas is sent into the lime kiln and mixed with air through the burner to ensure full combustion and release heat; S4. Recover the waste gas heat generated during the combustion process through the waste gas heat recovery system and collect the heat through a heat exchanger; S5. The heat collected by the heat exchanger is used to heat the delivery pipeline to maintain the temperature of the combustible gas.

2. The method for collecting and utilizing combustible gas generated during charcoal production according to claim 1, characterized in that: In step S1, an automatic temperature control system is used to accurately control the temperature in the furnace to ensure that the temperature of the wood is maintained within the range of 600°C-700°C.

3. The method for collecting and utilizing combustible gas generated during charcoal production according to claim 1, characterized in that: In the step S1, the combustible gas is generated in the furnace by controlling the oxygen concentration, and the oxygen concentration is controlled at 0%-10%.

4. The method for collecting and utilizing combustible gas generated during charcoal production according to claim 1, characterized in that: The closed gas collection system in step S2 includes a gas collection container, a gas flow meter, and a gas pressure sensor.

5. The method for collecting and utilizing combustible gas generated during charcoal production according to claim 1, characterized in that: The burner in step S3 is a reflow burner, which can automatically adjust the gas-air mixing ratio during the combustion process and adjust the combustion temperature through a feedback system.

6. The method for collecting and utilizing combustible gas generated during charcoal production according to claim 1, characterized in that: In step S3, the burner controls the mixing ratio of gas and air through an automatic adjustment system to ensure that the mixing ratio during the combustion process is 1:5-1:

10.

7. The method for collecting and utilizing combustible gas generated during charcoal production according to claim 1, characterized in that: The combustion temperature of the mixed gas in step S3 is 1000°C-1200°C.

8. The method for collecting and utilizing combustible gas generated during charcoal production according to claim 1, characterized in that: The exhaust gas heat recovery system in step S4 includes a heat exchanger, a heat pipe system and a thermal energy storage device, which effectively recovers and stores the heat in the exhaust gas.

9. The method for collecting and utilizing combustible gas generated during charcoal production according to claim 1, characterized in that: In step S5, the exhaust gas heat collected by the heat exchanger is used to heat the delivery pipeline, and the temperature of the combustible gas in the pipeline is maintained between 500°C and 600°C.

10. The method for collecting and utilizing combustible gas generated during charcoal production according to claim 1, characterized in that: The closed gas collection system in step S2 is made of high temperature resistant and corrosion resistant materials, specifically aluminum alloy, to ensure that the combustible gas does not leak during the transmission process and can withstand long-term use of high temperature gas.

Images