Cooking system for fungus grass raw materials

Abstract

The invention provides a cooking system for fungus grass raw materials. The cooking system is used for solving the problem that a large amount of heat energy is wasted in the prior art. The cooking system comprises a cooking pot, the top end of the cooking pot is connected with a feeding device, the bottom end of the cooking pot is communicated with a blowing pot, the top end of the cooking pot is provided with a suction opening, the side wall of the cooking pot is provided with a middle circulation connector, the inner side wall of the cooking pot is provided with a filter screen, the middle circulation connector is communicated with a warm black liquor tank, and the warm black liquor tank is communicated with a filter device and a condensing device. The side wall of the digester is communicated with a shunt pipe, the shunt pipe comprises one-way pipes which are respectively communicated with the top end and the bottom end of the digester, the one-way pipes are communicated through a connecting pipe, the one-way pipes are communicated with an alkali liquor tank, the alkali liquor pipe is communicated with a hot black liquor tank, a steam heating device is arranged on the hot liquor pipe, and the middle part of the digester is connected with a circulating pipe; and the circulating pipe is communicated with the hot black liquor tank and the hot liquor pipe through a three-way pipe. According to the method, the cooking black liquor generated in the previous cooking period is used as a heat source, so that the energy consumption is obviously reduced.

Description

Technical Field

[0001] The invention relates to the field of vertical cookers, and in particular to a cooking system for mushroom grass raw materials. Background Art

[0002] In the pulp and paper, biomass energy and other industrial production processes based on mushroom grass raw materials, cooking is a key pretreatment step to destroy the cell structure of the raw materials and release cellulose, hemicellulose and lignin for subsequent separation and processing. Traditional cooking systems mostly use external heat sources (such as steam and hot water) to heat the raw materials. After cooking, the black liquor containing a large amount of heat energy is usually directly filtered and discharged, resulting in a huge waste of heat energy resources. Summary of the invention

[0003] The present invention provides a cooking system for mushroom grass raw materials, which solves the problem of large amount of heat energy waste in the prior art.

[0004] The technical solution of the present invention is achieved in this way:

[0005] A cooking system for mushroom grass raw materials comprises a cooking pot, the top of the cooking pot is connected with a feeding device, the pulp outlet at the bottom of the cooking pot is connected with a spray pot through a pulp pump pipe, the top of the cooking pot is provided with an exhaust port, the side wall of the cooking pot is provided with a middle circulation interface, the inner side wall of the cooking pot is provided with a filter screen that can cover the middle circulation interface, the middle circulation interface is connected with a warm black liquid tank through a neutralizing liquid pipe, the warm black liquid tank is connected with a filtering device and a condensing device, the side wall of the cooking pot is connected with a shunt pipe, and the shunt pipe includes a shunt A one-way pipe is separately connected to the top and bottom of the cooking pot, the one-way pipes are connected through connecting pipes, the one-way pipe is connected to an alkali liquid tank through an alkali liquid pipe, the alkali liquid pipe is connected to a hot black liquid tank through a hot liquid pipe, a steam heating device is arranged on the hot liquid pipe, a circulation pipe is connected to the middle of the cooking pot, the circulation pipe is connected to the hot black liquid tank, the hot black liquid tank and the hot liquid heating device through a three-way pipe, the cooking pot is connected to a steam pipe, liquid pumps are arranged on the alkali liquid pipe and the hot liquid pipe, and valves are arranged on the three-way pipe and the one-way pipe.

[0006] Furthermore, the warm black liquor tank is connected to a filter device and a condensation device, the filter device is connected to a fiber metering bin, the condensation device is connected to a condensation wastewater treatment device and an odor treatment device, and a heat exchanger is provided outside the condensation device, and cold alkali liquid is introduced into the heat exchanger. Preheating and cooling the warm black liquor through the heat exchanger can reduce the demand for external energy, thereby reducing overall energy consumption, and the use of the condensation device and the odor treatment device helps to reduce the emission of harmful gases.

[0007] Furthermore, the feeding device includes an auger conveyor, and the side wall at the top of the cooking pot is connected to a steam inlet. The blowing effect of the steam makes the material evenly distributed, which facilitates more efficient heat conduction during the cooking process, reduces heat loss caused by uneven materials, helps to reduce energy consumption, and improves energy utilization efficiency.

[0008] Furthermore, the steam inlet is hinged with a plurality of S-shaped adjustment plates, which can be interlocked in sequence, and the same end of the adjustment plate is hinged with a driven rod, which is connected to each other through a connecting rod, and a stepper motor is fixed to the outside of the steam inlet, and the output shaft of the stepper motor is connected to one of the adjustment plates, and a limit plate is provided in the steam inlet, which can be against the end of the adjustment plate. The stepper motor realizes precise control of the adjustment plate, making the entire feeding and steam blowing process more automated, and can also realize precise adjustment of parameters such as the steam inlet opening and the steam injection angle, so as to meet the needs of different materials and cooking processes.

[0009] Furthermore, there are a plurality of intermediate circulation interfaces arranged in an array along the axis of the cooking pot, and a filter screen corresponding to the intermediate circulation interfaces is fixed to the inner side wall of the cooking pot. The filter screen is cylindrical and fixed to the side wall of the cooking pot through a connecting column, and the upper and lower ends of the filter screen are sealed against the side wall of the cooking pot through a sealing plate. By providing a plurality of intermediate circulation interfaces and corresponding filter screens, continuous and stable filtration of these suspended matter and impurities can be achieved. Effective filtration and sealing can reduce the loss of materials during the cooking process and improve the utilization rate of raw materials. The design of the first column and the second column provides a stable support for the filter screen, and can maintain the stability of the filter screen even under high temperature and high pressure working conditions, which helps to avoid displacement or damage of the filter screen due to vibration or pressure changes.

[0010] Furthermore, the connecting column includes a first column and a second column, the first column is fixedly connected to the inner side wall of the cooking pot, a first notch groove is provided on the side wall of the first column close to one end of the filter screen, the second column is fixed on a side close to the inner side wall of the cooking pot, a second notch groove is provided on the second column, the first notch groove cooperates with the second notch groove to hang and fix the filter screen, a boss is provided on the inner side wall of the cooking pot, a threaded groove is provided on the boss, a threaded plate is fixed on the side wall of the sealing plate close to one end of the cooking pot, the threaded plate is placed in the threaded groove, and the width of each threaded groove and thread on the threaded plate gradually increases from the bottom end of the cooking pot to the top. The design of quick clamping and threaded connection makes the installation and replacement process of the filter screen faster and reduces the downtime in production.

[0011] Furthermore, the steam pipe is connected to the upper and lower ends of the cooking pot respectively. When the cooking pot is heated only from one side or the bottom, the material may generate thermal stress due to uneven heating, resulting in structural damage or quality degradation. However, heating from both ends simultaneously can reduce the temperature gradient inside the material, reduce the generation of thermal stress, and thus protect the integrity and quality of the material.

[0012] The beneficial effects that this technical solution can produce.

[0013] The present invention utilizes the cooking black liquor (hot black liquor) generated in the previous cooking cycle as a heat source and pretreatment liquid, thereby significantly reducing energy consumption and chemical consumption, improving resource utilization, achieving energy conservation and emission reduction, and further recycling heat energy. Through the recycling and reuse of black liquor and the rational treatment of wastewater, wastewater discharge and environmental pollution are reduced, and the environmental friendliness of the production process is improved. Through the precise control of valves and liquid pumps, the precise addition and circulation of various liquids in the cooking process are achieved, and the convenience and automation of operation are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the planar structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the local planar structure during the hot black liquor treatment and temperature-raising cooking process of the present invention;

[0017] Figure 3 It is a schematic diagram of the planar structure of the cooking pot of the present invention;

[0018] Figure 4 It is a schematic diagram of the local planar structure of the filter screen of the present invention;

[0019] Figure 5 for Figure 3 A schematic diagram of the local enlarged structure at point A in the middle;

[0020] Figure 6 for Figure 3 A schematic diagram of the local enlarged structure at C in the middle;

[0021] Figure 7 for Figure 4 A schematic diagram of the local enlarged structure at B in the middle;

[0022] Figure 8for Figure 7 Schematic diagram of the partial enlarged structure of the middle connecting column.

[0023] Among them: 1. Cooking pot, 2. Feeding device, 3. Slurry pump pipe, 4. Spray pot, 5. Exhaust port, 6. Alkali liquid pipe, 7. Medium circulation interface, 8. Filter screen, 9. Warm black liquor tank, 10. Filter device, 11. Condensation device, 12. Connecting column, 13. One-way pipe, 14. Connecting pipe, 15. Alkali liquid tank, 16. Hot black liquor tank, 17. Steam heating device, 18. Circulation pipe, 19. Steam pipe, 20. Valve, 21. Hot liquid pipe, 22. Sealing plate, 24. Fiber metering bin, 25. Condensate sewage treatment device, 26. Odor treatment device, 27. Heat exchanger, 28. Auger conveyor, 29. Steam inlet, 30. Adjusting plate, 31. Follower rod, 32. Connecting rod, 33. Limiting plate, 34. First column, 35. Second column, 36. First notch groove, 37. Second notch groove, 38. Boss, 39. Threaded groove, 40. Threaded plate. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments 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.

[0025] In the description of this embodiment, it is necessary to understand that the terms "center, longitudinal, lateral, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

[0026] like Figure 1-3As shown, the present invention provides a cooking system for mushroom grass raw materials, including a cooking pot 1, the top of the cooking pot 1 is connected to a feeding device 2, the pulp outlet at the bottom of the cooking pot 1 is connected to a spray pot 4 through a pulp pump pipe 3, the top of the cooking pot 1 is provided with an exhaust port 5, the side wall of the cooking pot 1 is provided with a middle circulation interface 7, the inner side wall of the cooking pot 1 is provided with a filter screen 8 that can cover the middle circulation interface 7, the middle circulation interface 7 is connected to a warm black liquid tank 9 through a neutralizing liquid pipe, the warm black liquid tank 9 is connected to a filtering device 10 and a condensing device 11, the side wall of the cooking pot 1 is connected to a shunt pipe, and the shunt pipe includes a shunt pipe connected to the top of the cooking pot 1 respectively. The one-way pipe 13 is connected to the top and the bottom, the one-way pipe 13 is connected through a connecting pipe 14, the one-way pipe 13 is connected to the alkali liquid tank 15 through the alkali liquid pipe 6, the alkali liquid pipe 6 is connected to the hot black liquid tank 16 through the hot liquid pipe 21, and the hot liquid pipe 21 is provided with a steam heating device 17. The middle of the cooking pot 1 is connected to a circulation pipe 18, the circulation pipe 18 is connected to the hot black liquid tank 16 through a three-way pipe, and the hot black liquid tank 16 and the hot black liquid tank 16 are connected to the steam heating device 17. The cooking pot 1 is connected to a steam pipe 19, and the alkali liquid pipe 6 and the hot liquid pipe 21 are both provided with a liquid pump, and the three-way pipe and the one-way pipe 13 are provided with a valve 20. The valve 20, the liquid pump, the slurry pump and the steam heating device 17 are all prior art.

[0027] The device goes through the following steps during use:

[0028] 1. Loading: After the raw materials are iron-removed, screened and washed in the material preparation section, the qualified grass raw materials are sent to the top of the cooking pot 1 by the feeding device 2 for loading, and the fan extracts the gas in the cooking pot 1 at the same time.

[0029] 2. Steam heating and pre-hydrolysis reaction: Steam is introduced into the cooking pot 1 through the steam pipe 19 to hydrolyze the raw materials. The pH value of the steam condensate produced by the steam hydrolysis will drop to 2-3, and part of the hemicellulose will dissolve in the hydrolyzate, and part of the degraded hemicellulose will be adsorbed on the fiber surface. When the required P factor (hydrolysis factor) is reached, the hydrolysis reaction is terminated in time and the steam supply is stopped.

[0030] 3. Neutralization: After reaching the target P factor, the pre-hydrolysis reaction is stopped during neutralization. The alkali liquid in the alkali liquid tank 15 is heated by the alkali liquid pipe 6 and the steam heating device 17, and then pumped from the bottom of the cooking pot 1 into the cooking pot 1 to form a strongly alkaline neutralization liquid layer, which terminates the reaction by converting the acidic conditions of the pre-hydrolysis reaction into strongly alkaline conditions.

[0031] 4. Hot black liquor treatment: After neutralization, hot black liquor treatment is carried out immediately. First, hot black liquor is added from the bottom of the cooking pot 1. When the neutralizing liquid reaches the pot mouth, hot black liquor is added from the bottom and top of the cooking pot 1 at the same time, and then the neutralizing liquid is replaced from the middle of the cooking pot 1. In this way, the degraded hemicellulose is basically dissolved in the neutralizing liquid, and the replaced neutralizing liquid is stored in the warm black liquor tank. The hot black liquor can be the cooking black liquor generated from the previous cooking cycle of the hot black liquor tank 16. The heat and residual chemicals are used to pre-treat the chips, creating conditions for the next step of cooking a large amount of delignification, and also achieving energy-saving effects.

[0032] 5. Heating and cooking: The neutralized liquid and part of the hot black liquor enter the warm black liquor tank 9, where the black liquor is filtered and cooled by the fiber filter and then recovered. The black liquor is continuously replenished, and the hot black liquor is drawn out from the middle and lower part of the cooking pot 1 and sent back to the top and bottom. At the same time, the black liquor is circulated and heated by the steam heating device 17 to reach and maintain the highest cooking temperature. The target value of the H factor is reached by continuous circulation and replacement. The H factor represents the cumulative effect of temperature on the reaction rate during the cooking process and is an important indicator for evaluating the cooking effect.

[0033] 6. Termination reaction of dilute black liquor replacement: When the H factor reaches the target end point, the dilute black liquor extracted when washing the grass raw materials is used to replace the cooking residual liquor. The high-temperature cooking residual liquor is sent to the hot black liquor tank 16 for hot black liquor treatment in the next cooking cycle. The temperature of the dilute black liquor is about 90°C, which can quickly terminate the cooking reaction and facilitate accurate control and adjustment of the reaction degree. At the same time, the replacement process of the dilute black liquor is also the first washing process of the slurry.

[0034] 7. Pumping and discharging: Finally, the pulp is pumped out of the cooking pot 1 and sent to the spraying pot 4. The pumping concentration is about 5-6%. The pulp temperature is kept below 100°C by diluting with low-temperature black liquor, which avoids the disadvantage of flash evaporation of the liquid in the fiber cell cavity during traditional intermittent cooking and high-temperature spraying, which destroys the fiber strength. The pulp strength is good.

[0035] By setting the spray port 21, water can be used instead of black liquor to perform the heating and cooking process to fully clean the cooking pot 1. The filter screen 8 can separate the raw materials from the water to prevent the raw materials from entering the pipeline. Through the precise control of the valve 20 and the liquid pump, the precise addition and circulation of various liquids in the cooking process are realized, and the convenience and automation of the operation are improved. Through the recycling and reuse of black liquor and the reasonable treatment of wastewater, wastewater discharge and environmental pollution are reduced, and the environmental protection of the production process is improved. Compared with the traditional intermittent cooking method, this system realizes the continuous production of the cooking process and improves the production efficiency.

[0036] In the production operation, low-pressure steam is first introduced to heat up to 120-130℃, and then medium-pressure steam is introduced to heat up to 160-180℃. After steam hydrolysis, the pH value of the hydrolyzate drops to 2-3. After steam hydrolysis, part of the hemicellulose is dissolved in the steam condensate of the hydrolyzate, and part of the degraded hemicellulose is adsorbed on the fiber surface. The heating and insulation time is 3 hours in total, and the heating rate is 1℃ / min. When the required hydrolysis factor P factor is reached, the hydrolysis reaction should be terminated in time and the steam supply should be stopped. By accurately controlling the heating rate and temperature range, it can ensure that the raw materials react under the best conditions, thereby improving the quality and consistency of the product. It helps to avoid product quality problems caused by too high or too low temperature. Controlling the heating rate to 1℃ / min helps to achieve a uniform hydrolysis reaction and reduce unnecessary energy consumption and time waste. At the same time, when the required P factor is reached, the hydrolysis reaction is terminated in time to avoid excessive hydrolysis and improve the hydrolysis efficiency. The heating rate is set at 1°C / min. This slow and steady heating process helps reduce the negative impact of temperature changes on raw materials, such as structural damage or adverse chemical reactions caused by thermal stress. At the same time, by precisely controlling the heating rate and the holding time for a total of 3 hours, the hydrolysis reaction process can be adjusted more flexibly to adapt to different raw material characteristics and product requirements.

[0037] like Figure 1 As shown, the warm black liquor tank 9 is connected to a filter device 10 and a condensation device 11, the filter device 10 is connected to a fiber metering bin 24, the condensation device 11 is connected to a condensation sewage treatment device 25 and an odor treatment device 26, and a heat exchanger 27 is provided outside the condensation device 11, and cold alkali liquid is passed into the heat exchanger 27. The heat exchanger 27, the fiber metering bin 24, the sewage treatment device and the odor treatment device 26 are all prior art. The filter device 10 can be an existing fiber pressure screen.

[0038] The warm black liquor from the warm black liquor tank 9 is preheated with alkali liquor and cold water through the heat exchanger 27, so as to cool down the warm black liquor and heat the alkali liquor and cold water. The preheated alkali liquor is used to be transported to the alkali liquor tank 15. The cooled black liquor is sent to the filter device 10, which can filter the fibers in the black liquor. The filtered fibers enter the fiber metering bin 24, and the black liquor is sent to the evaporation station. The non-condensable gas in the warm black liquor is exhausted from the cooking pot 1 and the hot black liquor tank 16 into the warm black liquor tank 9, and the exhaust gas of the warm black liquor tank 9 enters the condensation device 11. The condensation device 11 converts part of the water vapor into condensed water, and the non-condensable gas is treated by the sewage treatment device and the odor treatment device 26, so as to ensure that the emissions meet the national environmental protection requirements and reduce environmental pollution. The waste heat of the warm black liquor is used to preheat the alkali liquor and cold water through the heat exchanger 27, which not only reduces the energy required for heating the alkali liquor, but also realizes the preheating of the cold water, thereby improving the overall energy utilization efficiency. The filtered fibers are discharged into the fiber metering bin 24, and these fibers can be further processed and utilized, thus maximizing the utilization of resources and reducing the difficulty and cost of subsequent wastewater treatment. The production cost is comprehensively reduced by the efficient utilization of energy and resources, reducing wastewater discharge and reducing equipment maintenance costs. The fibers in the black liquor are separated by the filtering device 10.

[0039] like Figure 1 As shown, the feeding device 2 includes an auger conveyor 28, and the side wall at the top of the cooking pot 1 is connected to a steam inlet 29. During the feeding process, the material may sometimes clump or accumulate due to factors such as humidity and particle size. The auger conveyor 28 can continuously convey the material, and the blowing effect of the steam can effectively break up these lumps and accumulations to facilitate the dispersion of the material, which can reduce the blockage and accumulation of the material during the conveying process and improve the conveying efficiency. In addition, the blowing effect of the steam can also allow the material to be preliminarily preheated and pretreated before entering the cooking pot 1, which helps to improve the chemical reaction rate and uniformity in the subsequent cooking process. The blowing effect of the steam can effectively break up these lumps and accumulations to prevent them from affecting the cooking effect after entering the cooking pot 1. Due to the good dispersibility of the material, the required reaction conditions can be achieved more quickly, thereby shortening the heating time and reducing energy consumption.

[0040] like Figure 3 , 6As shown, the steam inlet 29 is hinged with a plurality of S-shaped adjustment plates 30, which can be interlocked in sequence, and the same end of the adjustment plates 30 is hinged with a driven rod 31, which is connected to each other through a connecting rod 32. A stepper motor is fixed to the outside of the steam inlet 29, and the output shaft of the stepper motor is connected to one of the adjustment plates 30. A limit plate 33 is provided inside the steam inlet 29, and the limit plate 33 can be abutted against the end of the adjustment plate 30 near the side wall of the steam inlet 29. Through the design of the S-shaped adjustment plate 30 and the precise control of the stepper motor, the steam injection angle and intensity can be finely adjusted, so that the steam can be more evenly distributed in the steam cooking pot 1, ensuring that the materials in each area can be fully heated and reacted, which not only improves the efficiency of the chemical reaction, but also helps to ensure the consistency of product quality. The design of the driven rod 31 and the connecting rod 32 enables the multiple adjustment plates 30 to form a coordinated whole, which is convenient for adjusting the positions and angles of the multiple adjustment plates 30 at the same time according to actual needs, and improves the operational flexibility. By placing the stepper motor outside the steam inlet 29, the influence of steam on the stepper motor can be reduced. By setting the limit plate 33, not only the excessive rotation of the adjustment plate 30 is prevented, but also the sealing between the adjustment plate 30 and the side wall of the steam inlet 29 is ensured, thereby reducing the possibility of steam leakage and improving the reliability and safety of the system.

[0041] like Figure 3-5 As shown, there are multiple middle circulation interfaces 7 arrayed along the axis of the cooking pot 1, and the inner wall of the cooking pot 1 is fixed with a filter screen 8 corresponding to the middle circulation interface 7 one by one. The filter screen 8 is cylindrical and fixed to the side wall of the cooking pot 1 through a connecting column 12. The upper and lower ends of the filter screen 8 are sealed against the side wall of the cooking pot 1 through a sealing plate 22.

[0042] During the cooking process, the grass raw materials will gradually reduce in volume and produce some suspended matter or impurities as they are heated and softened. By setting up multiple intermediate circulation interfaces 7 and corresponding filter screens 8, continuous and stable filtration of these suspended matter and impurities can be achieved. Compared with a single large filter screen 8, it can capture and remove impurities more effectively, improve the filtration efficiency and filtration stability. The filter screen 8 is fixed to the side wall of the cooking pot 1 by a connecting column 12. This fixing method is both stable and easy to maintain. The connecting column 12 provides sufficient support for the filter screen 8 so that it can withstand various forces and pressures generated during the cooking process. The design of the cylindrical filter screen 8 increases the filtration area, allowing the raw materials to pass through the filter screen 8 more quickly, thereby improving the filtration efficiency. By setting sealing plates 22 at the upper and lower ends of the filter screen 8 and sealing against the side wall of the cooking pot 1, it is effectively prevented that the raw materials leak directly without filtration, ensuring the closedness of the system, reducing the loss of raw materials, and also protecting the safety of the operating environment.

[0043] like Figure 7 ,8 As shown, the connecting column 12 includes a first column 34 and a second column 35, the first column 34 is fixedly connected to the inner wall of the cooking pot 1, and a first notch groove 36 is provided on the side wall of the first column 34 close to the filter screen 8, the second column 35 is fixed on a side close to the inner wall of the cooking pot 1, and a second notch groove 37 is provided on the second column 35. The first notch groove 36 and the second notch groove 37 cooperate to hang and fix the filter screen 8, the inner wall of the cooking pot 1 is provided with a boss 38, and the boss 38 is provided with a threaded groove 39, and a threaded plate 40 is fixed on the side wall of the sealing plate 22 close to one end of the cooking pot 1, and the threaded plate 40 is placed in the threaded groove 39, and the width of the threads on the threaded grooves 39 and the threaded plates 40 gradually increases from the bottom end of the cooking pot 1 to the top.

[0044] During use, the threaded plates 40 of different specifications are screwed into the threaded grooves 39 of different heights in sequence. When the threads on the threaded plates 40 are locked relative to the threaded grooves 39, the second notch grooves 37 are screwed into the first notch grooves 36, so that the connection column 12 is connected. The cooperation of the first notch grooves 36 and the second notch grooves 37 makes the installation and removal of the filter 8 very simple. The operator only needs to screw the threaded plate 40 of the filter 8 into the threaded grooves 39 to fix the filter 8 without complicated tools or additional fasteners. The support of the first column 34 and the second column 35, as well as the precise cooperation of the threads on the threaded grooves 39 and the threaded plates 40, ensure the sealing and stability of the filter 8 during the cooking process. By rotating the threaded plate 40 to make it tightly embedded in the threaded grooves 39, a reliable sealing interface can be formed to effectively prevent the leakage of cooking liquid or steam. Although the design of the threaded plate 40 with gradually increasing width seems small, it brings great convenience in actual operation, allowing the operator to clearly identify the installation order and position of the filter 8. When replacing or cleaning the filter 8, the corresponding position of the filter 8 can be quickly found according to the width of the thread on the threaded plate 40, avoiding the risk of confusion and incorrect installation.

[0045] like Figure 1 As shown, the steam pipe 19 is connected to the upper and lower ends of the cooking pot 1 respectively. The traditional heating method only introduces steam from one side or the top of the cooking pot 1, resulting in uneven distribution of heat in the cooking pot 1, and it takes a long time to achieve the effect of overall uniform heating. However, when steam is introduced from both ends at the same time, convection can be quickly formed in the cooking pot 1, so that the heat is more evenly distributed in the material, thereby significantly improving the heating efficiency and shortening the heating time. Although introducing steam from both ends at the same time may increase the steam consumption, the overall energy consumption may be reduced due to the improvement of heating efficiency and the shortening of production cycle. In addition, uniform heating can also reduce energy waste caused by local overheating.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooking system for Juncao raw materials, comprising a cooking pot (1), characterized in that: The top of the cooking pot (1) is connected to a feeding device (2), the pulp outlet at the bottom of the cooking pot (1) is connected to a spray pot (4) through a pulp pump pipe (3), the top of the cooking pot (1) is provided with an exhaust port (5), the side wall of the cooking pot (1) is provided with a middle circulation interface (7), the inner side wall of the cooking pot (1) is provided with a filter screen (8) that can cover the middle circulation interface (7), the middle circulation interface (7) is connected to a warm black liquor tank (9) through a neutralizing liquid pipe, the warm black liquor tank (9) is connected to a filtering device (10) and a condensing device (11), the side wall of the cooking pot (1) is connected to a shunt pipe, the shunt pipe comprises a one-way pipe (13) respectively connected to the top and bottom of the cooking pot (1), the one-way pipe (13) is connected to the top and bottom of the cooking pot (1), and the one-way pipe (13) is connected to the top and bottom of the cooking pot (1). The connecting pipe (14) is connected, the one-way pipe (13) is connected to the alkali liquid tank (15) through the alkali liquid pipe (6), the alkali liquid pipe (6) is connected to the hot black liquid tank (16) through the hot liquid pipe (21), the hot liquid pipe (21) is provided with a steam heating device (17), the middle of the cooking pot (1) is connected to a circulation pipe (18), the circulation pipe (18) is connected to the hot black liquid tank (16) through a three-way pipe, and the hot black liquid tank (16) and the hot black liquid tank (16) are connected to the steam heating device (17) through the hot liquid pipe (21), the cooking pot (1) is connected to a steam pipe (19), the alkali liquid pipe (6) and the hot liquid pipe (21) are both provided with liquid pumps, and the three-way pipe, the one-way pipe (13) and the alkali liquid pipe (6) are all provided with valves (20).

2. A cooking system for Juncao raw materials according to claim 1, characterized in that: The filtering device (10) is connected to a fiber metering bin (24), the condensing device (11) is connected to a condensation wastewater treatment device (25) and an odor treatment device (26), a heat exchanger (27) is provided outside the condensing device (11), and cold alkali liquid is introduced into the heat exchanger (27).

3. The cooking system for Juncao raw materials according to claim 1 is characterized in that: The feeding device (2) comprises an auger conveyor (28), and the side wall at the top of the cooking pot (1) is connected to a steam inlet (29).

4. A cooking system for Juncao raw materials according to claim 3, characterized in that: The steam inlet (29) is hinged with a plurality of S-shaped adjustment plates (30), the adjustment plates (30) can be interlocked in sequence, the same end of the adjustment plates (30) is hinged with a driven rod (31), the driven rods (31) are connected to each other through a connecting rod (32), a stepper motor is fixed on the outside of the steam inlet (29), the output shaft of the stepper motor is connected to one of the adjustment plates (30), a limit plate (33) is provided inside the steam inlet (29), and the limit plate (33) can be abutted against the end of the adjustment plate (30).

5. The cooking system for Juncao raw materials according to claim 1 is characterized in that: A plurality of intermediate circulation interfaces (7) are arranged in an array along the axis of the cooking pot (1); filter screens (8) corresponding one to one with the intermediate circulation interfaces (7) are fixed to the inner side wall of the cooking pot (1); the filter screens (8) are cylindrical and fixed to the side wall of the cooking pot (1) via a connecting column (12); the upper and lower ends of the filter screen (8) are sealed against the side wall of the cooking pot (1) via a sealing plate (22).

6. A cooking system for Juncao raw materials according to claim 5, characterized in that: The connecting column (12) comprises a first column (34) and a second column (35), the first column (34) being fixedly connected to the inner side wall of the cooking pot (1), the side wall of the first column (34) close to one end of the filter screen (8) being provided with a first notch groove (36), the second column (35) being fixed to one side close to the inner side wall of the cooking pot (1), the second column (35) being provided with a second notch groove (37), the first notch groove (36) and the second notch groove (37) being cooperated to hang and fix the filter screen (8), the inner side wall of the cooking pot (1) being provided with a boss (38), the boss (38) being provided with a threaded groove (39), the side wall of the sealing plate (22) close to one end of the cooking pot (1) being fixed with a threaded plate (40), the threaded plate (40) being placed in the threaded groove (39), the width of the threads on the threaded grooves (39) and the threaded plates (40) gradually increasing from the bottom end of the cooking pot (1) to the top.

7. The cooking system for Juncao raw materials according to claim 1, characterized in that: The steam pipe (19) is respectively connected to the upper and lower ends of the cooking pot (1).

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