CN216266604U - Plant straw pretreatment system - Google Patents
Plant straw pretreatment system Download PDFInfo
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- CN216266604U CN216266604U CN202122793331.3U CN202122793331U CN216266604U CN 216266604 U CN216266604 U CN 216266604U CN 202122793331 U CN202122793331 U CN 202122793331U CN 216266604 U CN216266604 U CN 216266604U
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Abstract
The utility model provides a plant straw pretreatment system, and belongs to the technical field of environmental management. The utility model provides a material crushing system, a material mixing system, an ultrasonic-acid heat treatment system, a first solid-liquid separation system, a first washing system, a second solid-liquid separation system, a pressurization system, an alkali thermal hydrolysis treatment system, a cooling system, a pressure relief system, a magnetic separation system, a third solid-liquid separation system, a second washing system and a fourth solid-liquid separation system which are sequentially connected; wherein, the ultrasonic-acid heat treatment system is connected with the cooling system, and a weak alkaline aqueous solution inlet is arranged on a pipeline between a solid material discharge port of the second solid-liquid separation system and a feed inlet of the pressurization system; the alkali thermal hydrolysis treatment system is connected with a heat supply system. The plant straw pretreatment system provided by the utility model is a closed production system, can realize high-efficiency pretreatment production of plant straws by continuously feeding and discharging materials, and has stable pretreatment effect and high economic benefit.
Description
Technical Field
The utility model relates to the technical field of environmental management, in particular to a plant straw pretreatment system.
Background
At present, with the increasing of environmental protection and the gradual improvement of sewage discharge standard, the requirement of total nitrogen index is higher and higher, the general requirement reaches the first grade A standard of urban sewage discharge, namely TN is less than 15mg/L, and the discharge standard in some areas with higher environmental protection requirement is TN less than 10mg/L, which provides higher requirement for the denitrification treatment of sewage treatment. The existing denitrification treatment often has the problem of insufficient carbon source, and carbon sources such as sodium acetate, acetic acid, methanol, ethanol, glucose and the like must be added. Acetic acid, methanol and ethanol belong to dangerous chemicals and are rarely used for safety reasons; glucose has little use due to the slow denitrification rate. Sodium acetate is widely used due to high denitrification rate, wide sources and safe use, but the use cost is high and the method is not economical. In recent years, researchers are developing various composite carbon sources, aiming at improving the COD value of the carbon source, reducing the dosage of the carbon source and improving the cost performance.
Lignocellulose is the most abundant organic resource on earth, and can produce about 850 million tons in biosphere every year, and only 4.8% of human resources are utilized. The organic components in the lignocellulose mainly comprise 30-40% of cellulose, 20-30% of hemicellulose, 10-15% of lignin and the like. Many reports have been made on the use of lignocellulose as a carbon source for sewage treatment, although many reports have been made on the use of lignocellulose as a biomass fuel obtained by treating lignocellulose by physical, chemical, biological, or other methods. Due to the problems of complex material structure, existence of lignin and the like, lignocellulose is difficult to be directly used as a reverse digestion carbon source in a sewage treatment plant. Therefore, how to pretreat lignocellulose to improve the bioavailability thereof is a problem which needs to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a pretreatment plant powder, a pretreatment method of plant straws and a pretreatment system of plant straws, the method provided by the utility model can efficiently destroy lignin structures in plants, and simultaneously, cellulose and hemicellulose structures are not destroyed as far as possible, so that the bioavailability of the plants is improved; the method provided by the utility model has the advantages of simple process and high cost performance.
In order to achieve the purpose of the utility model, the utility model provides the following technical scheme:
the utility model provides a plant straw pretreatment system, which comprises a material crushing system, a material mixing system, an ultrasonic-acid heat treatment system, a first solid-liquid separation system, a first washing system, a second solid-liquid separation system, a pressurization system, an alkali heat hydrolysis treatment system, a cooling system, a pressure relief system, a magnetic separation system, a third solid-liquid separation system, a second washing system and a fourth solid-liquid separation system which are sequentially connected;
the ultrasonic-acid heat treatment system is connected with the cooling system, and a weak alkaline aqueous solution inlet is formed in a pipeline between a solid material discharge port of the second solid-liquid separation system and a feed inlet of the pressurization system; the alkali thermal hydrolysis treatment system is connected with a heat supply system.
Preferably, the device further comprises a drying system, and a feed inlet of the drying system is connected with a solid material discharge outlet of the fourth solid-liquid separation system.
Preferably, the first solid-liquid separation system, the second solid-liquid separation system, the third solid-liquid separation system and the fourth solid-liquid separation system are belt filter presses.
Preferably, the alkali thermal hydrolysis treatment system is a thermal hydrolysis reaction kettle.
The utility model provides a plant straw pretreatment system, which comprises a material crushing system, a material mixing system, an ultrasonic-acid heat treatment system, a first solid-liquid separation system, a first washing system, a second solid-liquid separation system, a pressurization system, an alkali heat hydrolysis treatment system, a cooling system, a pressure relief system, a magnetic separation system, a third solid-liquid separation system, a second washing system and a fourth solid-liquid separation system which are sequentially connected; the ultrasonic-acid heat treatment system is connected with the cooling system, and a weak alkaline aqueous solution inlet is formed in a pipeline between a solid material discharge port of the second solid-liquid separation system and a feed inlet of the pressurization system; the alkali thermal hydrolysis treatment system is connected with a heat supply system. The plant straw pretreatment system provided by the utility model is a closed production system, can realize high-efficiency pretreatment production of plant straws by continuously feeding and discharging materials, and has stable pretreatment effect and high economic benefit.
Drawings
FIG. 1 is a schematic view of the structure of a plant straw pretreatment system according to the present invention, wherein 1 represents a crushing system; 2-a mixing system; 3-ultrasonic-acid heat treatment system; 4-a first solid-liquid separation system; 5-a first washing system; 6-a second solid-liquid separation system; 7-a pressurized system; 8-an alkaline thermal hydrolysis treatment system; 9-a cooling system; 10-a pressure relief system; 11-a magnetic separation system; 12-a third solid liquid separation system; 13-a second washing system; 14-a fourth solid liquid separation system; 15-a weak base aqueous solution inlet; 16-a heating system; 17-drying system.
Detailed Description
The utility model provides a plant straw pretreatment system, which comprises a material crushing system, a material mixing system, an ultrasonic-acid heat treatment system, a first solid-liquid separation system, a first washing system, a second solid-liquid separation system, a pressurization system, an alkali heat hydrolysis treatment system, a cooling system, a pressure relief system, a magnetic separation system, a third solid-liquid separation system, a second washing system and a fourth solid-liquid separation system which are sequentially connected; the ultrasonic-acid heat treatment system is connected with the cooling system, and a weak alkaline aqueous solution inlet is formed in a pipeline between a solid material discharge port of the second solid-liquid separation system and a feed inlet of the pressurization system; the alkali thermal hydrolysis treatment system is connected with a heat supply system.
The plant straw pretreatment system comprises a material crushing system, wherein the material crushing system is used for crushing plant straws, and particularly crushing the air-dried plant straws to the granularity of 60-100 meshes.
The plant straw pretreatment system provided by the utility model comprises a mixing system, wherein the mixing system is arranged between a crushing system and an ultrasonic-acid heat treatment system and is used for mixing all materials, and specifically, plant powder obtained after crushing, a weak acid aqueous solution and a magnetic zeolite-manganese oxide catalytic material are mixed.
The plant straw pretreatment system provided by the utility model comprises an ultrasonic-acid heat treatment system, wherein the ultrasonic-acid heat treatment system is arranged between a mixing system and a first solid-liquid separation system and is used for realizing preheating treatment under an ultrasonic condition.
The plant straw pretreatment system provided by the utility model comprises a first solid-liquid separation system, a first washing system and a second solid-liquid separation system which are sequentially connected, and is used for carrying out solid-liquid separation and water washing on a system obtained after preheating treatment to be neutral, and carrying out solid-liquid separation again to obtain a second solid material.
The plant straw pretreatment system provided by the utility model comprises a pressurization system, an alkaline thermal hydrolysis treatment system, a cooling system and a pressure relief system which are sequentially connected, and meanwhile, the ultrasonic-acid thermal treatment system is connected with the cooling system; wherein the pressurization system is used for pressurizing the second solid material from normal pressure to the pressure required by the thermal hydrolysis treatment; the alkali thermal hydrolysis treatment system is used for performing thermal hydrolysis treatment; the cooling system is used for reducing the temperature of the thermal hydrolysis treatment system to room temperature and recovering heat to be used in the ultrasonic-acid thermal treatment system so as to meet the temperature requirement required by preheating treatment; the pressure relief system is used for reducing the pressure of the cooled thermal hydrolysis treatment system to normal pressure. By adopting the structure, the utility model is beneficial to realizing the continuous operation of the plant straw pretreatment process.
In the plant straw pretreatment system provided by the utility model, a weak alkaline aqueous solution inlet is arranged on a pipeline between a solid material discharge port of the second solid-liquid separation system and a feed inlet of the pressurization system and is used for feeding a weak alkaline aqueous solution.
In the plant straw pretreatment system provided by the utility model, the alkaline thermal hydrolysis treatment system is connected with a heat supply system and used for supplying heat to the alkaline thermal hydrolysis treatment system so as to meet the temperature requirement required by thermal hydrolysis treatment. The heating mode adopted by the heating system is not particularly limited, and medium indirect heating can be adopted; the type of the medium adopted by the medium indirect heating is not particularly limited, and the medium can be natural gas, electricity or industrial waste heat.
The plant straw pretreatment system provided by the utility model comprises a magnetic separation system, wherein the magnetic separation system is arranged between a pressure relief system and a third solid-liquid separation system and is used for removing a magnetic zeolite-manganese oxide catalytic material in a thermal hydrolysis treatment system after pressure relief. In the embodiment of the utility model, the treatment flow of the magnetic separation system is preferably 0.1-50 m3The magnetic induction intensity is preferably 100-1000 mT.
The plant straw pretreatment system provided by the utility model comprises a third solid-liquid separation system, a second washing system and a fourth solid-liquid separation system which are sequentially connected, and is used for carrying out solid-liquid separation and water washing on the residual materials after magnetic separation to neutrality, and carrying out solid-liquid separation again to obtain the pretreated plant powder.
As an embodiment of the utility model, the plant straw pretreatment system further comprises a drying system, wherein a feed inlet of the drying system is connected with a solid material discharge outlet of the fourth solid-liquid separation system, and is used for drying the solid material obtained after solid-liquid separation, so as to obtain the pretreated plant powder.
The utility model has no special limitation on each part in the plant straw pretreatment system, and adopts parts well known by the technical personnel in the field to meet the requirements, concretely, each solid-liquid separation system can adopt belt filter pressing to realize solid-liquid separation, and the alkali thermal hydrolysis treatment system can be a pyrolysis reaction kettle.
Fig. 1 is a schematic structural diagram of a plant straw pretreatment system according to the present invention, and the following describes a plant straw pretreatment method according to the present invention with reference to fig. 1. Crushing the air-dried plant straws by a crushing system; then the mixture enters a mixing system, water, weak acid and magnetic zeolite-manganese oxide catalytic materials are added, and the mixture is stirred and mixed uniformly; continuously feeding the materials into an ultrasonic-acid heat treatment system, providing ultrasonic conditions (the frequency is 20-50 kHz, the input power is 0.01-1W/mL), preheating the materials to 60-100 ℃ by using heat recovered by a rear-end cooling system, and staying for 0.1-5 h for preheating treatment; then carrying out first solid-liquid separation in a first solid-liquid separation system, washing the obtained first solid material in a first washing system until the first solid material is neutral, and then carrying out second solid-liquid separation in a second solid-liquid separation system; adding a weak base aqueous solution through a weak base aqueous solution inlet, feeding the weak base aqueous solution and a second solid material obtained by second solid-liquid separation into a pressurizing system, increasing the pressure from normal pressure to the pressure (0.45-1.5 MPa) required by thermal hydrolysis treatment, conveying the second solid material into an alkaline thermal hydrolysis treatment system, heating the second solid material to the temperature (150-200 ℃) required by thermal hydrolysis treatment by using a heating system, staying for 1-12 hours for thermal hydrolysis treatment, cooling a discharged material by using a cooling system to recover heat, preheating an ultrasonic-acid thermal treatment system by using a front end, and reducing the pressure to normal pressure by using a pressure relief system; and (3) performing magnetic separation on the decompressed materials in a magnetic separation system, recovering the magnetic zeolite-manganese oxide catalytic material, performing third solid-liquid separation on the residual materials in a third solid-liquid separation system, washing the obtained third solid material in a second washing system until the third solid material is neutral, and performing fourth solid-liquid separation in a fourth solid-liquid separation system to obtain the pretreated plant powder.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Relevant material sources and preparation methods in the following examples:
zeolite powder: particle size 200-300 mesh, Guangzhou Xin porcelain environmental protection materials Co.
Concentrated sulfuric acid (98 wt%), potassium permanganate, manganese sulfate monohydrate, ferrous sulfate heptahydrate, acetic acid and sodium acetate are all traditional Chinese medicine reagents.
The preparation method of the magnetic zeolite-manganese oxide catalytic material comprises the following steps:
the method comprises the following steps: boiling 100g of zeolite powder in water at 100 ℃ for 2h, filtering, and drying at 100 ℃ to obtain pretreated zeolite powder for later use; preparing 40mL of solution A containing 0.48g of potassium permanganate and 40mL of solution B containing 0.39g of manganese sulfate monohydrate and 0.5g of concentrated sulfuric acid, dispersing the pretreated zeolite powder in water to obtain 200mL of zeolite water suspension, synchronously dropwise adding the solution A and the solution B (the molar ratio of potassium permanganate to manganese sulfate is 4:3, and the molar ratio of sulfuric acid to manganese sulfate is 2:1) into the zeolite water suspension under the condition of stirring at 70 ℃, and after dropwise adding, carrying out hydrothermal reaction for 3 hours at 90 ℃; after the reaction is finished, filtering the obtained product system, and washing the obtained filter cake to be neutral to obtain zeolite-loaded manganese oxide;
step two: dispersing the zeolite-loaded manganese oxide into 200mL of water, adding 0.1g of hyperbranched polyethyleneimine, and performing ultrasonic dispersion to obtain a first intermediate system;
step three: aerating the first intermediate system under the condition that the aeration amount is 15L/min, simultaneously heating to 90 ℃, and dropwise adding 20mL of solution containing 1.8g of ferrous sulfate heptahydrate and 20mL of solution containing 0.6g of sodium hydroxide (the molar ratio of the ferrous sulfate to the sodium hydroxide is 1:2.32) into the obtained system to obtain a second intermediate system;
step four: stirring the second intermediate system at the constant temperature of 90 ℃ for reaction for 3min under the condition that the aeration quantity is 15L/min to obtain a third intermediate system;
step five: and carrying out magnetic separation on the magnetic catalytic material in the third intermediate system, washing the obtained magnetic catalytic material with water, and drying to constant weight to obtain the magnetic zeolite-manganese oxide catalytic material.
Example 1
The plant straw is pretreated by using the device shown in figure 1, and the steps are as follows:
firstly, crushing naturally air-dried plant straws in a crushing system to obtain plant straws with the grain size of 60-100 meshes, transferring 100kg of plant powder into a mixing system, adding 500kg of water, 0.5kg of acetic acid and 0.5kg of magnetic zeolite-manganese oxide catalytic material, and uniformly mixing; the obtained material is continuously pushed into an ultrasonic-acid heat treatment system, the ultrasonic frequency is controlled to be 40kHz, the input power is 0.01W/mL, the preheating temperature is controlled to be 80 ℃ (the material is heated by heat recovered by a rear-end cooling system), the material stays for 1h for preheating treatment, then first solid-liquid separation is carried out in a first solid-liquid separation system, the obtained first solid material is washed in the first washing system to be neutral, and then second solid-liquid separation is carried out in a second solid-liquid separation system; adding a 1 wt% sodium acetate aqueous solution through a weak base aqueous solution inlet, feeding the sodium acetate aqueous solution and a second solid material obtained by second solid-liquid separation into a pressurizing system, increasing the pressure from normal pressure to 1.5MPa, then conveying the solid material to an alkali thermal hydrolysis treatment system, heating the solid material to 200 ℃ by using a heat supply system, and staying for 3 hours for thermal hydrolysis treatment, wherein the heat supply system adopts natural gas to heat conduction oil for indirect heating; after the thermal hydrolysis treatment is finished, the material is pushed to a cooling system to be cooled to room temperature, and heat of heat exchange is used for front-end preheating treatment; the cooled material is pushed to a pressure relief system, the pressure is reduced to normal pressure, and then the material enters a magnetic separation system for magnetic separation, wherein the flow rate is 0.5m3And h, the magnetic induction intensity is 500mT, the magnetic zeolite-manganese oxide catalytic material is recovered, the recovery rate is 99%, the rest materials are subjected to third solid-liquid separation in a third solid-liquid separation system, the obtained third solid material is washed in a second washing system to be neutral, then fourth solid-liquid separation is carried out in a fourth solid-liquid separation system, the obtained fourth solid material is dried by a drying system to be constant in weight, the pretreated plant powder is obtained, the mass is 85kg, and the retention time of the materials in the whole pretreatment system is 5 h. The solid-liquid separation system related to the embodiment adopts belt filter pressing to realize solid-liquid separation, and the alkali thermal hydrolysis treatment system is a thermal hydrolysis reaction kettle.
Example 2
A pre-treated plant powder was prepared according to the method of example 1, except that citric acid was used instead of acetic acid and sodium citrate was used instead of sodium acetate, and the mass of the finally obtained pre-treated plant powder was 87 kg.
Example 3
Pretreated plant powder was prepared according to the method of example 1, except that the material was subjected to thermal hydrolysis treatment in an alkaline thermal hydrolysis treatment system at a temperature of 150 ℃, a pressure of 0.45MPa and a residence time of 6 hours, and the mass of the finally obtained pretreated plant powder was 90 kg.
According to the embodiment, the plant straw pretreatment process system provided by the utility model adopts the pressurization system and the pressure relief system to realize continuous material inlet and outlet and continuous production; and under the synergistic action of weak acid/weak base and catalytic material, the compact structure of cellulose-hemicellulose-lignin is destroyed by preheating treatment under the ultrasonic condition and then thermal hydrolysis treatment, so that lignin is decomposed, and the subsequent treatment efficiency is improved. In addition, the utility model adopts the magnetic catalytic material for catalysis to improve the pretreatment efficiency, and can quickly separate and treat the catalytic material from the system by magnetic separation, thereby recycling and having high economic benefit.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A plant straw pretreatment system is characterized by comprising a material crushing system, a material mixing system, an ultrasonic-acid heat treatment system, a first solid-liquid separation system, a first washing system, a second solid-liquid separation system, a pressurization system, an alkali heat hydrolysis treatment system, a cooling system, a pressure relief system, a magnetic separation system, a third solid-liquid separation system, a second washing system and a fourth solid-liquid separation system which are sequentially connected;
the ultrasonic-acid heat treatment system is connected with the cooling system, and a weak alkaline aqueous solution inlet is formed in a pipeline between a solid material discharge port of the second solid-liquid separation system and a feed inlet of the pressurization system; the alkali thermal hydrolysis treatment system is connected with a heat supply system.
2. The plant straw pretreatment system of claim 1, further comprising a drying system, wherein a feed inlet of the drying system is connected with a solid material discharge outlet of the fourth solid-liquid separation system.
3. The plant straw pretreatment system of claim 1, wherein the first, second, third and fourth solid-liquid separation systems are belt filter presses.
4. The plant straw pretreatment system of claim 1, wherein the alkaline thermal hydrolysis treatment system is a pyrolysis reaction kettle.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114012851A (en) * | 2021-11-15 | 2022-02-08 | 中冶生态环保集团有限公司 | Pretreatment plant powder, pretreatment method for plant straw and pretreatment system for plant straw |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114012851A (en) * | 2021-11-15 | 2022-02-08 | 中冶生态环保集团有限公司 | Pretreatment plant powder, pretreatment method for plant straw and pretreatment system for plant straw |
| CN114012851B (en) * | 2021-11-15 | 2024-04-26 | 中冶生态环保集团有限公司 | Pretreatment plant powder, plant straw pretreatment method and plant straw pretreatment system |
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