A pyrolysis carbonization process based on parallel equipment

Abstract

This invention relates to the field of pyrolysis carbonization technology and proposes a pyrolysis carbonization process based on parallel equipment, comprising the following steps: S10: transferring multiple pyrolysis kettles containing raw materials into multiple parallel-connected drying furnaces for drying treatment to evaporate the moisture; S20: transferring the multiple dried pyrolysis kettles into multiple parallel-connected pyrolysis furnaces respectively for pre-carbonization, pyrolysis, and calcination of the raw materials; wherein, high-temperature flue gas from the pyrolysis furnace is introduced into the drying furnace to provide heat. Through the above technical solution, the problem of temperature control in series-connected pyrolysis furnaces being limited to the temperature range of a single functional zone, and unable to cross the temperature ranges of several carbonization functional zones, requiring frequent lifting and replacement of pyrolysis kettles by workers to adapt to different temperature zones, increasing the risk of safety accidents, is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pyrolysis carbonization, in particular to a pyrolysis carbonization process based on parallel equipment. BACKGROUND

[0002] Biomass pyrolysis carbonization refers to a process of decomposing biomass raw materials (such as wood, crop residues, livestock and poultry manure, etc.) into biomass charcoal, combustible gas, vinegar liquid and biomass oil under high temperature and anaerobic conditions. After the soil kiln process was banned, the pyrolysis carbonization system usually uses a serial processing mode. The feature of this mode is that the temperature in each pyrolysis furnace is different and relatively stable, and is suitable for different functions of pre-carbonization, pyrolysis and calcination, respectively. Therefore, in the actual processing process, the temperature of each pyrolysis furnace is controlled within the temperature range of the single function zone, and cannot cross the temperature range of several carbonization function zones. Therefore, the pyrolysis kettle containing raw materials needs to be placed in each pyrolysis furnace with different functions in sequence. In this process, workers need to frequently hoist and replace the pyrolysis kettle to adapt to different temperature zones, which increases the risk of safety accidents such as coal gas poisoning, fire and high-temperature burns. SUMMARY

[0003] The present application proposes a pyrolysis carbonization process based on parallel equipment, which solves the problem that the temperature of the serially arranged pyrolysis furnace is controlled within the temperature range of the single function zone, cannot cross the temperature range of several carbonization function zones, and workers need to frequently hoist and replace the pyrolysis kettle to adapt to different temperature zones, which increases the risk of safety accidents.

[0004] The technical scheme of the present application is as follows: a pyrolysis carbonization process based on parallel equipment is used to pyrolyze and carbonize raw materials, which includes the following steps: S10: moving a plurality of pyrolysis kettles containing raw materials into a plurality of dry ovens arranged in parallel for drying treatment; S20: moving a plurality of dry treated pyrolysis kettles into a plurality of parallel pyrolysis furnaces for pre-carbonization, pyrolysis and calcination of the raw materials; wherein the high-temperature flue gas in the pyrolysis furnace is introduced into the dry oven for heat treatment.

[0005] Optionally, it further includes the following steps:

[0006] S11: occurring after the step S10, the step S11 is to finally control the temperature of the pyrolysis kettle in the dry oven to T, 100℃≤T≤150℃, so that the raw materials in the pyrolysis kettle produce a type of wood vinegar.

[0007] Optionally, it further includes the following steps:

[0008] S30: treating and separating the crude combustible gas generated by the pyrolysis kettle to generate wood vinegar, biomass oil and pyrolysis gas.

[0009] Optionally, the step S30 includes:

[0010] S301: The crude combustion gas is subjected to cooling treatment to form liquid wood vinegar and biomass oil and low-temperature gaseous pure combustion gas;

[0011] Optionally, the step S30 further comprises:

[0012] S302: The wood vinegar and biomass oil are separated and stored separately.

[0013] The wood vinegar is recycled as a circulating coolant of a water washing tower and a condensing tower; the separated biomass oil is transported to a biomass oil pool for storage and is transported to a pyrolysis furnace for combustion and heat supply on demand.

[0014] Optionally, the pre-carbonization, pyrolysis and calcination in the step S20 are specifically:

[0015] The pyrolysis gas and biomass oil, or only the pyrolysis gas, are transported to the pyrolysis furnace for use as combustion medium to provide heat for the pyrolysis and carbonization of the raw material in the pyrolysis kettle.

[0016] Optionally, the step further comprises:

[0017] S40: The high-temperature flue gas of the plurality of parallel pyrolysis furnaces is subjected to denitration treatment; and the denitrated flue gas is transported to a plurality of parallel drying furnaces for heat supply.

[0018] Optionally, the step further comprises:

[0019] S50: The low-temperature flue gas discharged from the drying furnace is treated and discharged.

[0020] Optionally, the step further comprises:

[0021] S21: Normal-temperature air is introduced into the pyrolysis furnace to cool the pyrolysis furnace and the pyrolysis kettle.

[0022] Optionally, the step further comprises:

[0023] S22: The charcoal in the cooled pyrolysis kettle is poured out, and the pyrolysis kettle is refilled with raw material for recycling.

[0024] The working principle and beneficial effects of the present application are as follows:

[0025] In the present application, the raw wood can be raw material, can also be mechanism stick, and other types of suitable carbonization of biomass raw material with a certain shape, in the present solution, taking the raw wood as an example, the raw wood is sorted and impurities are removed after natural air drying to a moisture content of not more than 30%, and is cut to a diameter of less than 10 cm and a length of less than 50 cm, and is loaded into a pyrolysis kettle, a combustion chamber is not arranged at the bottom of the drying furnace, and high-temperature flue gas generated by the pyrolysis furnace is used to provide heat for drying, the temperature of the high-temperature flue gas gradually decreases in the process of passing into the drying furnace, and the gas generated in the pyrolysis kettle during the drying process is collected. The high-temperature flue gas is controlled by valves, after the raw wood is dried, the drying furnace flue gas inlet and outlet valves are closed, the pyrolysis kettle is lifted out of the drying furnace, and the pyrolysis kettle with the raw wood inside is completed drying, and is lifted into a plurality of parallel pyrolysis furnaces by a crane to perform pre-carbonization, pyrolysis and calcination of the raw wood. The advantage of parallel arrangement of the pyrolysis furnace is that each pyrolysis furnace and drying furnace are relatively independent, and if a single pyrolysis furnace or drying furnace has a problem, it will not cause the entire system to shut down, and has little impact on production capacity, compared with a series type, the production capacity scale is small, and it is more suitable for large-scale production; under the same scale, the system occupies less area, the system flue gas is controlled by valves, and remote control can be used, thereby reducing the labor intensity of workers. Each pyrolysis furnace can independently control the temperature in the furnace, and does not interfere with each other, which is conducive to controlling the product quality, and the pre-carbonization, carbonization, calcination and cooling process of the raw wood can be completed in one pyrolysis furnace, the pyrolysis kettle does not need to be frequently lifted and replaced in different temperature zones, and safety accidents such as coal gas poisoning, fire and high-temperature scalding can be avoided, and the safety performance is high. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above-mentioned features, technical characteristics, advantages and implementation modes of the present application will be further described in the following preferred embodiments in a clear and easy-to-understand manner in combination with the accompanying drawings.

[0027] Figure 1 The present application is a process flow diagram.

[0028] In the figure: 1, pyrolysis kettle; 2, drying furnace; 3, pyrolysis furnace; 4, combustion chamber; 5, first pipeline; 6, denitration device; 7, fuel gas purification system; 8, second pipeline; 9, wood vinegar of the first type; 10, wood vinegar of the second type; 11, biomass oil; 12, pyrolysis gas; 13, bag-type dust collector; 14, third pipeline; 15, fourth pipeline. DETAILED DESCRIPTION

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the specific implementation modes of the present application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings and other embodiments from these drawings without creative labor.

[0030] For simplicity and conciseness of the drawings, only the parts related to the present application are shown in the drawings, which do not represent the actual structure of the product. In addition, for simplicity and ease of understanding, in some drawings, only one of the parts with the same structure or function is shown, or only one of them is marked. In this text, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0031] In this text, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In addition, in the description of the present application, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] Reference Figure 1 A pyrolysis carbonization process based on parallel equipment is proposed for pyrolysis carbonization of raw materials, including the following steps: step S10: moving a plurality of pyrolysis kettles 1 containing raw materials into a plurality of dry ovens 2 arranged in parallel for drying treatment; step S20: moving a plurality of dry treated pyrolysis kettles 1 into a plurality of pyrolysis ovens 3 arranged in parallel respectively for pre-carbonization, pyrolysis and calcination of raw materials; wherein the high-temperature flue gas in the pyrolysis oven 3 is introduced into the dry oven 2 to provide heat.

[0034] In this embodiment, biomass pyrolysis refers to a process of converting biomass into charcoal, liquid and gas and other low molecular substances through thermochemical conversion under the condition of air isolation or small amount of air supply. The gas product is a mixture of hydrogen, methane, carbon monoxide and carbon dioxide, etc., which is called pyrolysis gas. The raw material can be logs, machine-made rods, and other types of biomass raw materials suitable for carbonization with a certain shape. In this scheme, logs are taken as an example. After natural air drying to a moisture content of not more than 30%, the logs are sorted and impurities are removed, and then cut to a diameter of less than 10 cm and a length of less than 50 cm, and loaded into the pyrolysis kettle 1. The bottom of the drying furnace 2 is not provided with a combustion chamber 4, and the high-temperature flue gas generated by the pyrolysis furnace 3 is used to provide heat for drying. The temperature of the high-temperature flue gas gradually decreases in the process of passing into the drying furnace 2, and the gas generated in the pyrolysis kettle 1 during the drying process is collected. The inlet and outlet of the drying furnace 2 are controlled by valves, and after the logs are dried, the inlet and outlet valves of the drying furnace 2 are closed, the pyrolysis kettle 1 is lifted out of the drying furnace 2, and the pyrolysis kettle 1 with dried logs inside is lifted into multiple parallel pyrolysis furnaces 3 by a crane for pre-carbonization, pyrolysis and calcination of the logs. The advantage of parallel arrangement of the pyrolysis furnace 3 is that each pyrolysis furnace 3 and drying furnace 2 are relatively independent, and if a single pyrolysis furnace 3 or drying furnace 2 fails, it will not cause the entire system to shut down, and the impact on production capacity is small. Compared with the series type, the capacity scale is small, and it is more suitable for large-scale production. Under the same scale, the system occupies less area, and the flue gas is controlled by valves and can be remotely controlled, reducing the labor intensity of workers. Each pyrolysis furnace 3 can independently control the temperature in the furnace without interference, which is conducive to controlling the quality of the product, and the pre-carbonization, carbonization, calcination and cooling process of the logs can be completed in one pyrolysis furnace 3.

[0035] Specifically, the principle of realizing pre-carbonization, carbonization and calcination is that multiple pyrolysis furnaces 3 are arranged in parallel, and the temperature between them is not limited to a fixed temperature range. When the pyrolysis kettle 1 containing logs is placed in a pyrolysis furnace 3, the temperature of each pyrolysis furnace 3 can be controlled independently.

[0036] Each pyrolysis furnace 3 is provided with a combustion chamber 4 and a combustible gas burner, and the temperature in the combustion chamber 4 can be controlled by controlling the amount of gas entering the burner. The gas regulating valve commonly used to control the gas amount of the burner can automatically adjust the valve opening degree according to the set signal to accurately change the gas delivery flow, thereby controlling the amount of gas entering the burner and adjusting the temperature of the combustion chamber 4.

[0037] As preferred, each pyrolysis kettle 1 is provided with a temperature on-line detecting device, such as a thermocouple temperature sensor, a thermal resistance temperature sensor or an infrared temperature sensor, etc., to detect the temperature in the pyrolysis kettle 1 in real time. According to the temperature in the pyrolysis kettle 1, the combustion temperature in the combustion chamber 4 is controlled by controlling the amount of fuel gas entering the combustor, so as to realize the control of the temperature in the pyrolysis kettle 1.

[0038] Approximately: the temperature in the pyrolysis kettle 1 is about 150℃, the water contained in the raw material is evaporated in the drying stage, and is discharged through a pipeline or is recycled by condensation.

[0039] The temperature in the pyrolysis kettle 1 is about 150-270℃, which is the pre-carbonization stage. In this stage, the thermal decomposition reaction of the raw material is relatively obvious, and a large amount of gaseous pyroligneous liquid and a small amount of mixed gas of fuel gas are generated.

[0040] The temperature in the pyrolysis kettle 1 is about 270-450℃, which is the carbonization stage. The raw material is rapidly thermally decomposed to generate a large amount of gaseous mixed gas of biomass oil, pyroligneous liquid and fuel gas.

[0041] The temperature in the pyrolysis kettle 1 is about 450-600℃, which is the calcination stage. In this stage, the pyrolysis products (mainly biomass oil, pyroligneous liquid and fuel gas) are very few, and mainly the volatile substances remaining in the charcoal are discharged to improve the fixed carbon content in the charcoal.

[0042] Therefore, the pyrolysis kettle 1 does not need to be frequently lifted and replaced in different temperature zones, which can avoid safety accidents such as coal gas poisoning, fire and high-temperature scalding, and has high safety performance.

[0043] Further, the method further comprises the step of: S11: finally controlling the temperature of the pyrolysis kettle 1 in the drying furnace 2 to be T, 100℃≤T≤150℃, so that the raw material in the pyrolysis kettle 1 generates a type of pyroligneous liquid 9.

[0044] In this embodiment, the drying furnace 2 is connected in parallel, and the number of drying furnace 2 through which the high-temperature flue gas passes is used to control the temperature in the drying furnace 2 and the flue gas exhaust temperature, which not only ensures full recovery of high-temperature flue gas sensible heat, but also ensures that the logs in the drying furnace 2 are only dried and preliminarily heated, but do not produce combustible gas, so that poisoning accidents can be avoided and the safety of the system is improved. By controlling the temperature in the drying furnace 2, a higher quality type of wood vinegar 9 can be extracted. Here, the type of wood vinegar refers to wood vinegar produced at an ambient temperature of 150°C or below. As a preferred option, the temperature of the drying furnace 2 needs to be controlled at about 200°C, so that the temperature of the pyrolysis kettle 1 gradually rises and is ultimately controlled between 100°C and 150°C. When the temperature is higher, the pyrolysis of the raw materials in the kettle may occur, resulting in combustible gas and biomass oil. Wood vinegar is mainly a liquid product obtained by condensing and separating the steam gas mixture derived from the pyrolysis of raw materials. The composition of the wood vinegar collected is different as the reaction temperature changes during the pyrolysis of the raw materials. When the temperature of the steam gas produced during the pyrolysis of the raw materials is about 90°C (generally 82°C, with a strong smoke aroma), the gas produced is collected, and after cooling, it is a type of wood vinegar 9. When the temperature is greater than 150°C, the collection is stopped. By using this method, a high-concentration, large-quantity wood vinegar can be obtained, and the product type is increased because it does not contain biomass oil. Above this temperature, the vinegar will contain biomass oil components.

[0045] The temperature of the drying furnace 2 is controlled to be no more than 200°C, and when the temperature in the pyrolysis kettle 1 in the drying furnace 2 rises to about 90°C (generally 82°C), the collected water vapor is cooled to obtain a type of wood vinegar 9. When the temperature of the pyrolysis kettle 1 is higher than 150°C, the collection of the type of wood vinegar 9 is stopped, and the pyrolysis kettle 1 is moved from the drying furnace to the pyrolysis furnace for further heating and temperature rise. As the temperature rises, the logs in the pyrolysis kettle enter the pyrolysis carbonization stage, producing crude combustible gas, which contains a second type of wood vinegar 10 (which refers to crude combustible gas containing biomass oil and wood vinegar generated at a temperature above 200°C, and wood vinegar obtained by removing and separating biomass oil and combustible gas therefrom) and biomass oil. In summary, the drying furnace 2 not only collects a type of wood vinegar 9, but also has the function of preheating the raw materials.

[0046] It should be noted that wood vinegar is a mixture with quite complex components, and its main components are water, followed by organic acids, phenols, alcohols, and ketones. The collection temperature of wood vinegar is as follows:

[0047] The wood vinegar collected below 80°C is mostly water (about 97% or more), and the proportion of organic acids and phenols, alcohols and other substances is very small (about 3% or less). The wood vinegar collected at 80-150°C has a reduced water content (about 40%) after the removal of most of the water below 80°C, and the proportion of organic acids and other phenols, alcohols and other substances increases (about 60% or more). The wood vinegar collected above 150°C has biomass oil and its decomposition products dissolved in it (about 30% of organic impurities), and needs to be separated before use. It should be noted that the above proportion data is affected by many factors such as raw material type (e.g. different wood), preparation process, equipment conditions, etc. Here, the experimental data is for reference only, and only shows the changes in the composition of the wood vinegar collected at different temperatures, providing guidance for the quality of wood vinegar collection.

[0048] It should be noted that the above proportion data is affected by many factors such as raw material type (e.g. different wood), preparation process, equipment conditions, etc. Here, the experimental data is for reference only, and only shows the changes in the composition of the wood vinegar collected at different temperatures, providing guidance for the quality of wood vinegar collection.

[0049] Further, it further includes the step of: S30: treating and separating the crude fuel gas generated by the pyrolysis kettle 1 to generate the second type of wood vinegar 10, biomass oil 11 and pyrolysis gas 12. Step S30 includes: S301: cooling the crude fuel gas to form liquid second type of wood vinegar 10, biomass oil 11 and low-temperature gaseous pure fuel gas 12; Step S30 further includes: S302: separating and storing the second type of wood vinegar 10 and biomass oil 11 separately; wherein the second type of wood vinegar 10 is used as a circulating coolant for the water washing tower and the condensing tower; the separated biomass oil 11 is transported to the biomass oil pool for storage and delivered to the pyrolysis furnace 3 as needed for combustion.

[0050] In this embodiment, the gaseous mixture containing biomass oil, wood vinegar and fuel gas generated during each stage of the pyrolysis process, i.e. the crude fuel gas, the separation principle of each substance in the crude fuel gas is: as the temperature of the fuel gas decreases, the biomass oil and wood vinegar vapor in the crude fuel gas condenses into liquid biomass oil and wood vinegar mixture, which enters the vinegar buffer pool. In the vinegar buffer pool, the wood vinegar and biomass oil are separated and stratified into tar layer and vinegar layer due to the density difference. The wood vinegar can be directly sold as crude vinegar, or can be refined and processed to sell refined wood vinegar, or can be added with other ingredients to make high-value-added products to increase system revenue. The biomass oil extracted from the tar layer can be sold as a product, or can be transported to the combustion chamber of the pyrolysis furnace for combustion. The time required for refining and separating wood vinegar and biomass oil is relatively long, and separation equipment such as centrifugal oil-water separator, filter type oil-water separator, etc. can also be used for separation.

[0051] Specifically, one of the reference examples is that the high-temperature crude gas enters a water washing tower to directly contact with the low-temperature second type wood vinegar 10 for preliminary cooling of the high-temperature crude gas. The crude gas after preliminary cooling enters a first-stage condensing tower and a second-stage condensing tower (in the actual process, the number of stages of the condensing tower is not limited to two, and multiple stages of condensing towers can be set according to the actual situation) in turn to repeatedly contact with the low-temperature second type wood vinegar 10 for further cooling, and the biomass oil 11 in the crude gas is also further removed and separated. Then, the crude gas indirectly contacts with the circulating cooling water. The second type wood vinegar 10 in the crude gas condenses into liquid with the decrease of the temperature of the crude gas. The second type wood vinegar 10 and the biomass oil 11 condensed into liquid are separated and recovered. The crude gas reduced to normal temperature is the pyrolysis gas 12. The second type wood vinegar 10 is one of the main products in the original wood pyrolysis carbonization process (stored separately from the first type wood vinegar 9), mixed in the crude gas in gaseous form, and enters the gas purification system 7 together with the crude gas for cooling and purification of the crude gas generated by the pyrolysis kettle 1. With the decrease of the temperature of the crude gas, the second type wood vinegar 10 and the biomass oil 11 gradually condense into liquid and are discharged from the bottom of the water washing tower, the condensing tower, the intercooler and other equipment, and enter the circulating liquid buffer tank. In the buffer tank, the second type wood vinegar 10 and the biomass oil 11 are preliminarily separated and placed. The second type wood vinegar 10 is used as the circulating coolant of the water washing tower and the condensing tower. With the progress of production, the amount of the second type wood vinegar 10 and the biomass oil 11 gradually increases. When the storage capacity of the circulating buffer tank reaches a certain amount, the mixed liquid of the second type wood vinegar 10 and the biomass oil 11 in the buffer tank is further separated by an oil-water separator. The separated second type wood vinegar 10 is transported to the wood vinegar buffer tank for temporary storage, and then is centrally transported to the wood vinegar storage tank for storage. The separated biomass oil 11 is stored in the biomass oil tank and is transported to each pyrolysis furnace 3 for combustion and heat supply according to the production needs. In the case of permission, part of the biomass oil 11 can be introduced into the pyrolysis furnace 3 for auxiliary combustion and heat supply, which can reduce the use amount of pure gas and can be used for power generation and other purposes to improve the energy utilization rate.

[0052] Further, the pre-carbonization, pyrolysis and calcination in step S20 are specifically that the pyrolysis gas 12 and the biomass oil 11, or only the pyrolysis gas 12, are transported to the pyrolysis furnace 3 to be used as combustion medium to provide heat for the pyrolysis and carbonization of the original wood in the pyrolysis kettle 1.

[0053] In this embodiment, the pyrolysis furnace 3 is provided with a combustion chamber 4 at the bottom, and the pyrolysis gas 12 and biomass oil 11, or only the pyrolysis gas 12, are transported to the pyrolysis furnace 3 as combustion medium to provide heat for the pyrolysis and carbonization of the logs in the pyrolysis kettle 1. The pyrolysis furnace 3 has a combustion chamber 4 at the bottom, which is provided with a crude gas burner and a biomass oil burner. The self-produced crude gas and biomass oil 11 are burned to generate heat to heat the pyrolysis kettle 1. By controlling the combustion of crude gas and biomass oil, the pre-carbonization, pyrolysis and calcination of logs in the pyrolysis kettle 1 are completed in the same pyrolysis furnace 3, which improves the energy utilization rate.

[0054] Further, it further comprises the step of: S40: treating the high-temperature flue gas of the plurality of parallel pyrolysis furnaces 3 by denitrification, wherein the denitrified flue gas is transported to the plurality of parallel drying furnaces 2 to provide heat.

[0055] In this embodiment, the high-temperature flue gas of the plurality of parallel pyrolysis furnaces 3 is collected, and the flue gas temperature is about 350-400℃, which is transported to the SCR reactor for denitrification treatment to meet the environmental protection requirements.

[0056] Further, it further comprises the step of: S50: treating and discharging the low-temperature flue gas discharged from the drying furnace 2.

[0057] In this embodiment, as a preferred embodiment, the treatment and discharge can be that the collected low-temperature flue gas is transported to the bag filter 13 through a pipeline. The bag filter 13 can remove most of the particulate matter in the flue gas, including fine dust and ash, reducing the particulate matter emission to the environment and reducing air pollution. The flue gas purified by the bag filter 13 is extracted from the bag filter 13 by the flue gas induced draft fan and is sent to the subsequent treatment equipment or directly discharged. The flue gas induced draft fan ensures the stability of the flue gas flow and prevents poor discharge caused by pressure changes. By controlling the flue gas flow rate, the operating efficiency of the entire system is optimized. The flue gas treated by the bag filter 13 and the flue gas induced draft fan is finally discharged into the atmosphere through a chimney or other discharge port.

[0058] Further, it further comprises the steps of: S21, introducing normal temperature air into the pyrolysis furnace 3 as needed to cool the pyrolysis furnace 3 and the pyrolysis kettle 1, and S22, pouring out the charcoal in the cooled pyrolysis kettle 1 and sending it to the charcoal bin, and the pyrolysis kettle 1 is refilled with logs for recycling.

[0059] In this embodiment, after the calcination is completed, the supply of the crude gas and the biomass oil 11 is cut off, and air is supplied in an appropriate amount as needed, and the pyrolysis furnace 3 and the pyrolysis kettle 1 are slowly cooled. When the temperature in the pyrolysis kettle 1 is lower than 150°C, no combustible gas is emitted, and the pyrolysis kettle 1 can be removed to the cooling area for further cooling. Specifically, the flue gas outlet valve of the pyrolysis furnace 3 is closed, the valve connecting the pyrolysis kettle 1 and the gas purification system 7 is closed, the pyrolysis kettle 1 is lifted and moved into the cooling rack for deep cooling. When the temperature in the pyrolysis kettle 1 is lower than 50°C, the lid of the pyrolysis kettle 1 is opened, and the charcoal in the pyrolysis kettle 1 is poured out in the charcoal pouring device.

[0060] Specifically, the plurality of drying furnaces 2 are connected in parallel with respect to the first pipeline 5, the storage container of the biomass oil 11 is connected to the combustion chamber 4 of the pyrolysis furnace 3 through the third pipeline 14 and the branch pipeline connecting the third pipeline 14 and the pyrolysis furnace 3; the storage container of the pyrolysis gas 12 is connected to the combustion chamber 4 of the pyrolysis furnace 3 through the fourth pipeline 15 and the branch pipeline connecting the fourth pipeline 15 and the pyrolysis furnace 3; the gas generated by the plurality of pyrolysis furnaces 3 is respectively discharged from the upper part of each pyrolysis furnace 3 and then enters the first pipeline 5; the gas generated by the pyrolysis kettle 1 in the pyrolysis furnace 3 after being heated by the pyrolysis furnace 3 is discharged from the pipeline connected to the pyrolysis kettle 1 and then enters the second pipeline 8.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A parallel equipment based pyrolytic carbonization process for pyrolytic carbonization of a feedstock, characterized by, It comprises the following steps: S10: move a plurality of pyrolysis kettles (1) filled with raw materials into a plurality of dry ovens (2) arranged in parallel for drying treatment; S11: finally control the temperature of the pyrolysis kettle (1) in the dry oven (2) to T, 100℃≤T≤150℃, so that the raw materials in the pyrolysis kettle (1) produce steam gas, and the steam gas is collected and stored separately when the temperature reaches 82℃~90℃, and the collection is stopped when the temperature is greater than 150℃, and the steam gas after cooling is a type of wood vinegar; S20: move a plurality of dry treated pyrolysis kettles (1) into a plurality of pyrolysis ovens (3) arranged in parallel for pre-carbonization, pyrolysis and calcination of the raw materials; Wherein, the high-temperature flue gas in the pyrolysis oven (3) is introduced into the dry oven (2) to provide heat; S30: collect the raw fuel gas generated at a temperature above 200℃ in the pyrolysis kettle (1) and process and separate it to generate a second type of wood vinegar (10), biomass oil (11) and pyrolysis gas (12); The step S30 comprises: S301: cooling treatment of the raw fuel gas to form liquid second type of wood vinegar (10), biomass oil (11) and low-temperature gaseous pure fuel gas.

2. A pyrolytic carbonization process based on parallel equipment according to claim 1, characterized in that, The step S30 further comprises: S302: separate and store the second type of wood vinegar (10) and biomass oil (11) separately; Wherein, the second type of wood vinegar (10) is used as a circulating coolant for water washing tower and condensing tower; the separated biomass oil (11) is transported to a biomass oil pool for storage and delivered to the pyrolysis oven (3) as needed for combustion heating.

3. A pyrolytic carbonization process based on parallel equipment according to claim 1, characterized in that, The pre-carbonization, pyrolysis and calcination in step S20 are specifically: The pyrolysis gas (12) and biomass oil (11), or only the pyrolysis gas (12) are transported to the pyrolysis oven (3) as combustion medium to provide heat for the pyrolysis and carbonization of the raw materials in the pyrolysis kettle (1).

4. A pyrolytic carbonization process based on parallel equipment according to claim 2, characterized in that, It further comprises the steps: S40: denitration treatment of the high-temperature flue gas of the plurality of parallel pyrolysis ovens (3); Wherein, the denitrated flue gas is transported to a plurality of parallel dry ovens (2) to provide heat.

5. A pyrolytic carbonization process based on parallel equipment according to claim 4, characterized in that, It further comprises the steps: S50: treat and discharge the low-temperature flue gas discharged from the dry oven (2).

6. A pyrolytic carbonization process based on parallel equipment according to claim 5, characterized in that, It further comprises the steps: S21: introduce normal temperature air into the pyrolysis oven (3) as needed to cool down the pyrolysis oven (3) and the pyrolysis kettle (1).

7. A pyrolytic carbonization process based on a parallel plant according to claim 6, characterized in that, It further comprises the steps: S22: pour out the charcoal in the cooled pyrolysis kettle (1), and refill the pyrolysis kettle (1) with raw materials for recycling.

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