Smoking system based on integration of wood acid pickling and pyrolysis smoking

Abstract

The invention relates to a smoking system based on wood acid pickling and pyrolysis smoking integration. The smoking system comprises a wood raw material crushing unit, a wood chip acid pickling unit, a pyrolysis smoke production unit, a smoke treatment unit and a smoking baking unit which are connected in sequence. Before pyrolysis, the acetic acid solution is used for cleaning the wood chips under the heating condition, and inorganic impurities including trace alkali metal and alkaline earth metal in the wood chips can be effectively removed. The inorganic substances are intrinsic catalysts for catalyzing the generation of polycyclic aromatic hydrocarbons and promoting the cracking of cellulose to small-molecule carbonyl compounds (bad flavor) in the pyrolysis process. The produced smoked food not only retains natural radix aucklandiae, but also promotes generation of saccharides and derivatives due to the fact that wood raw materials are cleaned by acetic acid, and a richer, mellower and more layered top-level smoked flavor is actively constructed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of smoking, in particular to a smoking system based on integrated wood pickling and pyrolysis smoking. BACKGROUND

[0002] Traditional smoking process uses direct combustion of wood to produce smoke for food smoking. The smoke produced during combustion penetrates into the food, giving the food a unique taste and aroma. However, the composition of the smoke is uncontrollable, the pyrolysis temperature is unstable, and harmful substances such as benzopyrene and polycyclic aromatic hydrocarbons (PAHs) are easily produced, posing a serious food safety hazard. At the same time, the process is discontinuous, energy consumption is high, and production efficiency is low.

[0003] To improve the pollution problem of traditional smoking, liquid smoking technology using pre-made smoking liquid has emerged. For example, patent number CN109699729B discloses a "smoking liquid atomizing device", which can effectively control harmful substances, but loses the complex flavor levels produced by natural wood pyrolysis, resulting in a single product flavor that cannot meet the market demand for traditional smoking flavor; and patent number CN116058402B discloses a "clean production method for smoked sausages", which controls the composition, moisture content and particle size of the smoking wood chips to effectively control the conversion of biomass in the smoking wood chips into polycyclic aromatic hydrocarbons, reducing the pollution of polycyclic aromatic hydrocarbons, tar and other substances on smoked products; In summary, wood raw materials are inevitably contaminated with soil, pesticides and other pollutants during collection, and wood itself contains inorganic metal trace elements that catalyze the generation of harmful substances such as polycyclic aromatic hydrocarbons during pyrolysis.

[0004] Traditional smoking methods cannot accurately control the smoking process, and current liquid smoking technology cannot reproduce the complex flavors of traditional smoking, making it impossible to provide traditional smoking flavors.

[0005] Wood smoking, smoke purification, and food smoking are mostly independent processes, with complex equipment, insufficient utilization of system heat, discontinuous production process, resulting in low overall energy efficiency and high production cost.

[0006] Existing steaming ovens or smoking rooms require external provision of smoking sources, and cannot achieve integrated and automated production from wood raw materials to smoked food. The smoking wood itself is not pretreated, harmful substances cannot be avoided from the source, and the composition of the smoking flavor cannot be actively intervened and optimized.

[0007] Therefore, there is an urgent need for a continuous and integrated device that can directly couple wood pretreatment, controllable pyrolysis, and food smoking, and effectively pretreat the smoking material before smoking to systematically control the generation of harmful substances and optimize the flavor. SUMMARY

[0008] In view of the deficiencies of the prior art, the present application provides a smoking system based on the integration of wood pickling and pyrolysis smoking to solve the above problems.

[0009] The present application provides the following technical solutions: The smoking system based on the integration of wood pickling and pyrolysis smoking comprises, in sequence, a wood raw material crushing unit, a wood chip pickling unit, a pyrolysis smoking unit, a smoke treatment unit and a smoking roasting unit.

[0010] Preferably, the wood raw material crushing unit adopts a wood crusher for crushing the wood to a particle size of less than 5 mm.

[0011] Preferably, the wood chip pickling unit comprises an acid pickling tank and a stirrer installed in the acid pickling tank, and a heating device is arranged on the acid pickling tank to control the liquid temperature in the acid pickling tank at 30-90°C.

[0012] Preferably, the wood chip pickling unit uses an aqueous acetic acid solution as the pickling solution, the concentration of which is 1wt%-10wt%, and the pH value of the pickling solution is controlled at 2-3; the solid-liquid volume ratio of the wood chips to the pickling solution is controlled at 1 / 10-1 / 2, and the pickling time is controlled at 4-12 hours; after the wood chips are pickled in the wood chip pickling unit, the moisture content of the naturally air-dried wet wood chips is maintained within the range of 10%-40% by weight.

[0013] Preferably, a feeding device is arranged between the wood raw material crushing unit and the wood chip pickling unit, and the feeding device comprises at least two groups of feeding hoppers arranged in an up-down manner, and a third valve is installed at the output end of the feeding hoppers.

[0014] Preferably, the pyrolysis smoking unit comprises a screw conveyor and a first electric heater wrapped outside the screw conveyor, the output end of the screw conveyor is connected with a gas-solid separator, and the lower end of the gas-solid separator is connected with a biochar collector through a first valve.

[0015] Preferably, the pyrolysis smoking unit controls the internal temperature thereof at 400-500°C, and makes the wood chips pyrolyze in an oxygen-free environment to generate high-temperature smoke and biochar; and the smoke treatment unit controls the temperature of the internal smoke thereof at 100-200°C.

[0016] Preferably, the smoke treatment unit comprises a gas-oil separator with a second electric heater built-in, and the lower end of the gas-oil separator is connected with a heavy tar collector through a second valve.

[0017] Preferably, the smoking and baking unit comprises an oven, and a plurality of hollow racks arranged in layers in the oven, a temperature and humidity control module and an air blowing system are installed on the oven, the temperature and humidity control module is used for controlling the temperature and humidity in the oven, and the air blowing system is used for controlling the air inlet and outlet of the oven.

[0018] Preferably, the smoked and baked plum is used for forming black plums; Preferably, the wood is composed of 48%-52% of plum branch, 18%-22% of plum wood and 27%-33% of fruit wood by weight percentage; In the first stage, the temperature in the smoking and baking unit is set to 60-65 DEG C, the relative humidity is 50%-60%, the circulating air speed is 2-3 m / s, and the smoking time lasts for 20-24 hours; In the second stage, the temperature in the smoking and baking unit is set to 40-45 DEG C, the relative humidity is below 30%, the circulating air speed is 4-3 m / s, and the smoking and drying continues for 20-24 hours; After the smoking and drying, the black plums are taken out after the temperature in the smoking and baking unit naturally decreases to below 40 DEG C.

[0019] The present application has the following beneficial technical effects: Before pyrolysis, the wood chips are cleaned under heating condition by using acetic acid solution, which can effectively remove the inorganic impurities in the wood chips, including trace amounts of alkali metals and alkaline earth metals.

[0020] The produced smoked food not only has natural wood fragrance, but also actively builds richer, more mellow and more layered top-grade smoked flavor due to the generation of sugars and derivatives promoted by the acetic acid cleaning of wood raw materials, and the flavor complexity and fullness are far superior to traditional smoking and cannot be compared with liquid smoking products.

[0021] Through the acetic acid cleaning measure to inhibit the generation of polycyclic aromatic hydrocarbons from the source, and combined with flue gas purification, the content of benzopyrene and total polycyclic aromatic hydrocarbons in the final product is zero. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the present application; Figure 2 is a structural schematic diagram of the wood chip pickling unit of the present application; Figure 3 is a structural schematic diagram of the pyrolysis and smoking unit of the present application; Figure 4 is a structural schematic diagram of the flue gas treatment unit of the present application; Figure 5Figure is a schematic diagram of the smoke roasting unit structure of the present application.

[0023] The reference signs in the figures are: 100, wood raw material crushing unit; 200, wood chip pickling unit; 21, pickling tank; 22, stirrer; 23, heating device; 24, liquid discharge valve; 300, pyrolysis smoke making unit; 31, screw conveyor; 32, first electric heater; 33, gas-solid separator; 34, biochar collector; 35, first valve; 400, smoke gas treatment unit; 41, gas-oil separator; 42, heavy tar collector; 43, second valve; 500, smoke roasting unit; 51, oven; 52, hollow placement bar; 53, temperature and humidity control module; 54, air blowing system; 600, feeding device; 61, feeding hopper; 62, third valve. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0025] Embodiment one: A smoke system based on wood pickling and pyrolysis smoking integration, as shown in Figures 1-5 , comprises: It comprises wood raw material crushing unit 100, wood chip pickling unit 200, pyrolysis smoke making unit 300, smoke gas treatment unit 400 and smoke roasting unit 500 connected in sequence.

[0026] The wood raw material crushing unit 100 adopts a wood crusher to crush the collected wood to below 5mm in particle size.

[0027] As shown in Figure 2 , the wood chip pickling unit 200 comprises a pickling tank 21, which is an acid-resistant container and is internally provided with a stirrer 22 for mixing wood chips and pickling liquid. The pickling tank 21 is equipped with a heating device 23, which can accurately control the liquid temperature at 30-90℃; Pickling liquid: aqueous acetic acid as pickling liquid, with a concentration of 1wt%-10wt%, and the pH value of the pickling liquid is about 2-3; Solid-liquid ratio and pickling time: the solid-liquid volume ratio of wood chips to pickling liquid is controlled between 1 / 10 and 1 / 2, and the pickling time is controlled between 4-12 hours; Wood chip dewatering: after the pickling is completed, the pickling liquid is discharged, and the moisture content of the naturally dried wood chips is maintained within the range of 10%-40% by weight; Acid washing effectively removes inorganic impurities from sawdust, including trace amounts of alkali and alkaline earth metals. These inorganic substances are intrinsic catalysts that catalyze the formation of polycyclic aromatic hydrocarbons (PAHs) and promote the decomposition of cellulose into small-molecule carbonyl compounds (undesirable flavors) during pyrolysis. Removing inorganic impurities not only inhibits PAH formation at its source but, more importantly, alters the pyrolysis pathway, significantly promoting the conversion of cellulose into sugars and sugar derivatives (such as L-glucan). These substances are key precursors to the sweet, caramel, and complex aroma layers in high-quality smoked flavors, thus achieving a leap from "passive harm reduction" to "active flavor enhancement," fundamentally unifying flavor and safety.

[0028] A feeding device 600 is installed between the sawdust pickling unit 200 and the pyrolysis smoke-making unit 300. The feeding device 600 is used to continuously and controllably add pickled sawdust into the pyrolysis smoke-making unit 300. The feeding device 600 adopts a two-stage feeding design, including two feed hoppers 61 arranged vertically. A third valve 62 is installed at the output end below the feed hoppers 61. Feeding can be achieved without stopping the machine through the two feed hoppers 61, ensuring the continuity of production.

[0029] like Figure 3 As shown, the pyrolysis-based flue gas production unit 300 includes a pyrolyzer, with its feed end connected to the output end of the feed hopper 61. The main body of the pyrolyzer is a jacketed cylinder, with a screw conveyor 31 inside, driven by a motor, and a first electric heater 32 encased in the outer jacket. The temperature inside the screw conveyor 31 is precisely controlled at 400℃–500℃ by a control system, allowing the sawdust to undergo rapid pyrolysis in an anaerobic environment, generating high-temperature flue gas and biochar.

[0030] The pyrolysis flue gas production unit 300 also includes a gas-solid separator 33, which is connected to the discharge end of the pyrolyzer. Utilizing the principles of gravity and inertia, the gas-solid separator separates the solid biochar produced after pyrolysis from the high-temperature flue gas. Below the gas-solid separator 33 is a biochar collector 34, and a first valve 35 is installed on its connecting pipe to facilitate periodic emptying of the biochar without interrupting system operation.

[0031] like Figure 4 As shown, the flue gas treatment unit 400 includes a gas-oil separator 41, whose inlet is connected to the flue gas outlet of the gas-solid separator 33 via an insulated pipe. The gas-oil separator 41 is equipped with a second electric heater, which can precisely control the temperature of the high-temperature flue gas between 100℃ and 200℃, allowing high-molecular-weight, poor-flavor, and harmful heavy tar components in the flue gas to selectively condense and precipitate at this temperature. A heavy tar collector 42 is connected to the bottom of the gas-oil separator 41 for collecting and storing the condensed heavy tar. A second valve 43 is provided on the pipeline between the heavy tar collector 42 and the gas-oil separator 41 to facilitate regular discharge and cleaning of the tar.

[0032] As shown in Figure 5 The smoke roasting unit 500 includes an oven 51, and the flue gas inlet of the oven 51 is directly connected to the gas outlet of the gas-oil separator 41 through a pipeline. The clean and warm flue gas after removal of heavy tar is introduced into the closed cavity of the oven 51 from the top or the upper side of the oven 51.

[0033] A plurality of hollow racks 52 made of food-grade stainless steel are arranged in the cavity of the oven 51 in layers to carry the food to be processed (such as whole fish, green plums, etc.).

[0034] A temperature and humidity control module 53 is installed on the oven 51, which includes high-precision temperature and humidity sensors arranged on the inner wall of the oven 51, and an electric heating unit, a compressor and a steam generating device arranged outside the oven 51. According to the preset program, the temperature and humidity in the cavity of the oven 51 are controlled by the high-precision temperature and humidity sensors and the electric heating unit, the compressor and the steam generating device, so as to realize the combination and flexible switching of various processing modes such as drying, smoking and curing.

[0035] A blowing system 54 is installed on the oven 51, which includes an air circulation fan arranged in the oven 51, and adjustable air inlets and outlets are designed on the box body, which is used to cool down or ensure uniform airflow in the box during smoking and non-smoking stages, and ensure uniform heating and smoking of the food.

[0036] Working principle: First, the wood raw materials such as sawdust are crushed to a particle size of less than 5 mm by the wood raw material crushing unit 100, and then sent to the sawdust pickling unit 200. The sawdust is stirred in a 1wt%-10wt% acetic acid solution under heating conditions. After treatment, drainage and drying, pretreated sawdust free of inorganic impurities is obtained.

[0037] Subsequently, the pretreated sawdust is continuously sent to the pyrolyzer through the feeding device 600. The pretreated sawdust is uniformly forwarded by the screw conveyor 31 in the pyrolyzer, and heated by the first electric heater 32 in the process, and controlled pyrolysis is carried out at a temperature range of 400-500°C to produce high-temperature flue gas and biochar. Then it is conveyed to the gas-solid separator 33, and the flue gas and the biochar are separated in the gas-solid separator 33, and the biochar is collected into the biochar collector 34.

[0038] The high-temperature flue gas enters the gas-oil separator 41 and is condensed at 100-200°C, which can effectively condense and remove heavy tar components with large molecular weight, poor flavor and possible harm, while retaining small-molecule, volatile, good flavor substances, further improving the safety and flavor purity of the smoked food. The heavy tar is removed and collected by the heavy tar collector 42, and the remaining hot flue gas rich in small-molecule flavor substances is introduced into the oven 51 from the top end through a pipeline.

[0039] In the oven 51, the hot flue gas is in full contact with the food on the hollow food shelf 52, and the food is smoked.

[0040] The temperature and humidity control module 53 precisely regulates the temperature and humidity of the smoking environment, and the air blowing system 54 ensures uniform distribution of the flue gas. Finally, the smoking, baking and drying of the food are completed in one processing flow, producing smoked food with excellent flavor and high safety.

[0041] By using acetic acid cleaning to inhibit the generation of polycyclic aromatic hydrocarbons from the source, after cleaning the inorganic impurities with acetic acid, the directional thermal conversion of the sawdust volatile matter is ensured, thereby ensuring the highest smoke production efficiency; combined with flue gas purification, the content of benzopyrene and total polycyclic aromatic hydrocarbons in the final product is zero.

[0042] There are significant differences between the sawdust after acetic acid cleaning and the untreated sawdust in the smoking and baking process. The acid cleaning process effectively removes (removal rate of more than 99%) trace amounts of inorganic impurities such as alkali metals and alkaline earth metals in the sawdust, which are originally internal catalysts for catalyzing the generation of polycyclic aromatic hydrocarbons (PAHs) and promoting the cracking of cellulose into small molecules with undesirable flavor. Therefore, the acid-washed sawdust can significantly inhibit the generation of polycyclic aromatic hydrocarbons from the root.

[0043] In the pyrolysis stage, due to the removal of impurities, the pyrolysis process is more controllable and efficient, and more complete pyrolysis can be achieved at slightly lower temperatures (-50°C), producing purer flue gas with reduced heavy tar components. This directly improves the smoking efficiency: the proportion of effective flavor substances (such as phenols and sugar derivatives) in the flue gas is higher, allowing the smoking time required to achieve the desired color and flavor to be moderately shortened. At the same time, acetic acid cleaning also actively intervenes in the pyrolysis path, promoting the conversion of cellulose to flavor precursor substances such as sugars and levoglucosan, thereby building a more rich, mellow and layered top-level smoking flavor with stability and purity far exceeding untreated sawdust.

[0044] In addition, the acid-washed sawdust absorbs water more uniformly, and the moisture content is easier to accurately control, ensuring the stability of the pyrolysis process. Finally, the smoked products produced using acid-washed sawdust have a cleaner surface, uniform color, and no tar residue, reducing the need for subsequent cleaning.

[0045] In summary, the acid pickling pretreatment realizes the transition from "passive harm reduction" to "active flavor modulation", which not only ensures food safety but also significantly improves the flavor quality and process controllability of the product.

[0046] Example two, including all the contents of example one, the difference is: Smoked plum for making food; Plum selection: choose fresh plums with moderate maturity, complete shape, no disease and insect pests and mechanical damage.

[0047] Washing: rinse the plums with clean water to remove surface dust and impurities.

[0048] Wilt: evenly spread the washed plums on the ventilated bamboo tray, and spread in the ventilated and cool place for several hours until the surface water is naturally dried. This step helps the penetration of the subsequent smoked ingredients.

[0049] Wood chip pretreatment: weigh 50% of plum branches, 20% of plum wood, and 30% of fruit wood (such as apple wood) by weight percentage, crush the particle size to less than 2mm and mix evenly.

[0050] Put the mixed wood chips into the acid pickling tank, add 10wt% acetic acid solution, and the solid-liquid ratio is 1 / 5.

[0051] Start stirring and heating, control the temperature at 40°C, and continue cleaning for 4 hours.

[0052] After treatment, drain the waste acid and naturally air dry to about 20% moisture content.

[0053] Pyrolysis and smoking preparation: put the pretreated wood chips into the pyrolyzer through the feeding device 600, control the feeding speed to be 1kg / h, and set the pyrolysis temperature to be 450℃. This temperature is conducive to producing smoke with soft flavor and rich in phenolic and sugar derivatives.

[0054] The high-temperature smoke generated by pyrolysis enters the gas-oil separator 41 after removing the biochar by the gas-solid separator 33, and the internal temperature is controlled at 120℃. The heavy tar is removed by condensation to obtain clean hot smoke rich in small molecule flavor substances.

[0055] After wilting, evenly and single-layerly place the plums on the multi-layer hollow placement bars 52 of the oven 51, and the loading amount should not be too dense to ensure smooth airflow.

[0056] Introduce the clean hot smoke from the top of the oven 51, and the smoking process is divided into two stages: First stage (deep smoking and dehydration): Control the temperature in the oven 51 at 60-65°C, relative humidity at 50-60%, circulating air speed at 2-3 m / s, and smoking time for 20-24 hours. This stage aims to make the green plum surface uniformly adsorb the smoke components and start the slow evaporation of internal moisture, and the plum color gradually deepens.

[0057] Second stage (drying and shaping): Reduce the temperature in the oven 51 to 40-45°C, reduce the relative humidity to below 30%, adjust the air speed to 4-5 m / s, and continue to smoke and dry for 20-24 hours. This stage further dehydrates and shrinks the green plum, the fruit flesh becomes solid and black, the smoke flavor penetrates the fruit core, and finally meets the finished product requirements of dark plum (usually with a moisture content of less than 20%).

[0058] During the whole process, the temperature and humidity control module 53 ensures the accurate and stable process parameters, and the air blowing system 54 ensures the uniform distribution of smoke and hot air among the green plums, preventing local over-drying or uneven smoking.

[0059] After the smoking and drying is completed, the pyrolysis system is turned off, and the dark plum is taken out after the temperature in the oven 51 naturally decreases to below 40°C.

[0060] Under the premise of ensuring the pretreatment effect, the same acidity of the smoke solution can be used to replace acetic acid for pickling, and the efficiency of removing inorganic matter is similar.

[0061] Acid pickling condition fine tuning: If the processing time requirement is shorter, 10wt% acetic acid can be used at 85°C for 2 hours; if the acid concentration requirement is lower, 5wt% acetic acid can be used with appropriately extended processing time to 4 hours.

[0062] Pyrolysis temperature adjustment: According to the specific characteristics of the wood chips used (such as hardwood or softwood), the working temperature of the pyrolyzer can be adjusted within a certain range (for example, 400-500°C) to optimize the gas production and flavor composition.

[0063] Finally, according to the requirements, vacuum packaging or sealed bag packaging is carried out, and the product is stored in a cool and dry place, resulting in a traditional dark plum product with black color, rich smoke flavor, and soft flesh.

[0064] Example Three: Includes all the contents of Example Two, with the following differences: 1) Wood chip pretreatment: a) Break the branches of plum trees, plum wood and apple wood chips into particles with a particle size of less than 1 mm.

[0065] b) Use 5wt% acetic acid solution to stir and wash at 60°C for 6 hours, with a solid-liquid ratio of 1:10.

[0066] c) After acid pickling, naturally air dry to a moisture content of 20%.

[0067] 2) Prunus mume production: a) Select fresh Prunus mume with moderate maturity, complete fruit shape, no disease and insect pests, and no mechanical damage.

[0068] b) Rinse the Prunus mume with clean water to remove surface dust and impurities.

[0069] c) Evenly spread the washed Prunus mume on a ventilated bamboo tray in a ventilated and cool place for several hours until the surface moisture is naturally dried.

[0070] 3) Smoking and baking: a) Mix the pre-treated sawdust according to the above ratio and send it to the pyrolysis unit.

[0071] b) Control the pyrolysis temperature at 450°C, and make the sawdust pyrolyze to generate high-temperature smoke and biochar in an oxygen-free environment.

[0072] c) After the smoke gas passes through the gas-oil separator to remove heavy tar, it enters the smoking and baking unit.

[0073] d) Evenly and single-layerly place the wilted Prunus mume on the multi-layered hollow placement bars of the oven.

[0074] e) The smoking process is divided into two stages: First stage (deep smoking and dehydration): control the oven temperature at 60-65°C, relative humidity at 50-60%, circulating air speed at 2-3 m / s, and smoking time for 20-24 hours.

[0075] Second stage (drying and shaping): reduce the oven temperature to 40-45°C, reduce the relative humidity to below 30%, and adjust the air speed to 4-5 m / s, continue to smoke and dry for 20-24 hours.

[0076] Finished product processing: a) After the smoking and drying is completed, turn off the pyrolysis system, and after the oven temperature naturally drops to below 40°C, take out the Prunus mume.

[0077] b) Perform sensory evaluation and physicochemical index detection on the Prunus mume to ensure that it meets the standards: spherical or oblate spherical shape, surface is dark black or brown and wrinkled, fruit core is hard and brown yellow, with weak odor and extremely sour taste; the moisture content is not more than 16.0%, the total ash content is not more than 5.0%, the water-soluble extract is not less than 24.0%, and the citric acid content is not less than 12.0% calculated as dry product.

[0078] The above embodiments only express the specific implementation of the present application, which is described in more detail and in more detail, but cannot be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. A smoking system based on the integration of wood acid pickling and pyrolysis smoking, characterized in that, The wood material crushing unit (100), the wood chip pickling unit (200), the pyrolysis smoke making unit (300), the smoke treatment unit (400) and the smoke roasting unit (500) are sequentially connected.

2. The smoking system based on integration of wood pickling and pyrolysis smoking according to claim 1, characterized in that, The wood material crushing unit (100) is provided with a wood crusher for crushing the wood into a particle size of less than 5 mm.

3. The smoking system based on integration of wood pickling and pyrolysis smoking according to claim 1, characterized in that, The wood chip pickling unit (200) comprises an acid pickling tank (21) and a stirrer (22) installed in the acid pickling tank (21), and a heating device (23) is arranged on the acid pickling tank (21) for controlling the liquid temperature in the acid pickling tank (21) to be 30-90℃.

4. The smoking system based on integration of wood pickling and pyrolysis smoking according to claim 1, characterized in that, The wood chip pickling unit (200) uses an aqueous acetic acid solution as the pickling solution, and the concentration of the pickling solution is 1wt%-10wt%, the pH value of the pickling solution is controlled to be 2-3, the solid-liquid volume ratio of the wood chip and the pickling solution is controlled to be 1 / 10-1 / 2, and the pickling time is controlled to be 4-12 hours; the moisture content of the wood chip after being pickled by the wood chip pickling unit (200) is maintained to be 10%-40% by weight.

5. The system according to claim 1, wherein the system is characterized by: The wood material crushing unit (100) and the wood chip pickling unit (200) are provided with a feeding device (600) comprising at least two groups of feeding hoppers (61) arranged in an upper-lower mode, and a third valve (62) is installed at the output end of the feeding hopper (61).

6. The smoking system based on integration of wood pickling and pyrolysis smoking according to claim 1, characterized in that, The pyrolysis smoke making unit (300) comprises a screw conveyor (31) and a first electric heater (32) wrapped outside the screw conveyor (31), the output end of the screw conveyor (31) is connected with a gas-solid separator (33), and the lower end of the gas-solid separator (33) is connected with a biochar collector (34) through a first valve (35).

7. The system according to claim 1, wherein the system is integrated with wood acid pickling and pyrolysis smoking. The pyrolysis smoke making unit (300) controls the internal temperature to be 400-500℃, and makes the wood chip pyrolyze in an oxygen-free environment to generate high-temperature smoke and biochar; and the smoke treatment unit (400) controls the temperature of the internal smoke to be 100-200℃.

8. The smoking system based on integration of wood pickling and pyrolysis smoking according to claim 1, characterized in that, The smoke treatment unit (400) comprises a gas-oil separator (41) provided with a second electric heater, and the lower end of the gas-oil separator (41) is connected with a heavy tar collector (42) through a second valve (43).

9. The system according to claim 1, wherein the system is integrated with wood acid pickling and pyrolysis smoking. The smoke roasting unit (500) comprises an oven (51) and a plurality of hollow racks (52) arranged in an upper-lower mode inside the oven (51), a temperature and humidity control module (53) and a blowing system (54) are installed on the oven (51), the temperature and humidity control module (53) is used for controlling the temperature and humidity inside the oven (51), and the blowing system (54) is used for controlling the air inlet and outlet of the oven (51).

10. The smoking system based on integration of wood pickling and pyrolysis smoking according to claim 1, characterized in that, The method is used for smoking green plum to form dark plum; The wood is composed of 48%-52% of plum branch, 18%-22% of plum wood and 27%-33% of fruit wood; and the moisture content of the pickled wood chip is controlled to be 18%-22%. The first stage is that the temperature in the smoking and baking unit (500) is set to 60-65 DEG C, the relative humidity is 50-60%, the circulating air speed is 2-3 m / s, and the smoking time lasts for 20-24 hours. The second stage is that the temperature in the smoking and baking unit (500) is set to 40-45 DEG C, the relative humidity is below 30%, the circulating air speed is 4-3 m / s, and the smoking and drying continue for 20-24 hours. After the smoking and drying are finished, the temperature in the smoking and baking unit (500) is naturally reduced to below 40 DEG C, and then the dark plums are taken out.

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