Method for preparing briquette fuel from macleaya cordata extraction residues and sludge
By mixing the extracted slag with the sludge and adding calcium oxide and other additives, stirring, drying and pressing the molding, the problems of high energy consumption and serious pollution in the existing technology of sludge fuel preparation are solved, and low-cost and high-efficiency molding fuel preparation and resource utilization are achieved.
Patent Information
- Application Number
- CN202410146584.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-01
- Publication Date
- 2025-08-01
AI Technical Summary
The existing methods for preparing molding fuels for sludge and Boluohui extracting slag have problems such as high energy consumption, high cost, large emissions of polluted gases and particulate matter, and the utilization rate of Boluohui extracting slag is low.
The molding fuel is prepared by mixing the sludge with the sludge, adding calcium oxide, concave and concave stick soil and other additives, and stirring, drying and pressing.
It has achieved the preparation of molded fuels with low energy consumption, low cost, high energy density, low pollution gases and particulate matter emissions, and has improved the yield and activity of Boluohui extracts, which is suitable for large-scale industrial applications.
Smart Images
Figure CN120399772A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the fields of Chinese herbal medicine extraction and sludge disposal, and relates to a method for resource utilization of Macleaya cordata extraction residue and sludge, in particular to a method for preparing briquette fuel by using Macleaya cordata extraction residue and sludge. Background Art
[0002] Sludge contains a large amount of heavy metals, pathogens and organic matter, and is a potential fuel that can be widely used. However, the existing briquette fuel made from sludge still has the following defects: (1) Due to the high moisture content of sludge, the calorific value of sludge combustion is still very low. Therefore, before sludge is burned as fuel, it is usually necessary to dehydrate and dry the sludge to effectively reduce the moisture content of sludge; further, in the process of sludge dehydration and drying, there are not only defects such as high energy consumption and low dehydration efficiency, but also the organic matter content in sludge is likely to decrease sharply, resulting in a lower calorific value of combustion, increased costs and waste of resources; at the same time, in the existing sludge drying methods, when the moisture content of sludge is reduced to 40%-60%, it presents a "sticky" state, with very strong adhesion and agglomeration ability, and is likely to adhere to the surface of the drying equipment, which will not only increase energy consumption, cleaning difficulty and operating costs, but also reduce the service life of the equipment, and at the same time cause a significant decrease in heat transfer efficiency and drying rate. (2) Although the mixed fuel made from sludge and agricultural and forestry wastes (such as biomass like corn straw, rice straw, etc.) improves the energy density of the fuel to a certain extent, during the combustion process of the fuel, due to the high sulfur and nitrogen content of sludge itself and the alkaline earth elements contained in agricultural and forestry wastes, a large amount of sulfur oxides, nitrogen oxides and particulate matter (PM) will be emitted, resulting in the combustion exhaust gas being difficult to meet the emission standards, and further bringing problems such as acid rain and smog, polluting the environment and human health; further, in order to effectively reduce the emissions of polluting gases and particulate matter, a sulfur fixative and a combustion improver need to be added to the mixed fuel. Such treatment not only easily reduces the energy density of the fuel, but also is not conducive to forming, or requires greater extrusion energy, resulting in a more complex preparation process, higher preparation costs, and being not conducive to batch production and industrial application; at the same time, in order to ensure the up-to-standard emission of polluting gases and particulate matter, it is also necessary to pickle and alkali-wash the agricultural and forestry wastes, or install desulfurization and denitrification equipment and dust removal equipment at the gas outlet end, which will undoubtedly increase the treatment difficulty and treatment costs. (3) In order to obtain a better forming effect, a large amount of binder usually needs to be added in the existing preparation methods of sludge fuel. Such treatment not only easily increases the complexity of the preparation process, but also increases the preparation costs and brings the risk of secondary pollution. Therefore, how to obtain a sludge-based briquette fuel with a simple process, convenient operation, low cost, high preparation efficiency, low energy consumption, high energy density, and low production of polluting gases and particulate matter is of great significance for promoting the reduction and resource utilization of sludge.
[0003] At present, for the extraction of Macleaya cordata (Willd.) R.Br., traditional methods such as leaching and reflux are mostly used. However, due to the effect of the cell wall of Macleaya cordata, the solution is difficult to act on the interior of the cells, resulting in characteristics such as low yield and poor activity of the Macleaya cordata extract. At the same time, the Macleaya cordata extraction residue generated during the extraction process has rarely been studied and is mostly discarded or directly burned, which is likely to cause waste of resources and secondary pollution. Therefore, providing a method for the resource utilization of Macleaya cordata extraction residue has a promoting effect on effectively solving the environmental pollution problems generated during the Macleaya cordata extraction process. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to provide a method for preparing briquettes by using Macleaya cordata extraction residue and sludge, which has the advantages of simple process, convenient operation, low cost, high preparation efficiency, low energy consumption, high energy density, and low production of polluting gases and particulate matter, aiming at the deficiencies existing in the prior art.
[0005] To solve the above technical problems, the technical solution adopted by the present invention is:
[0006] A method for preparing briquettes by using Macleaya cordata extraction residue and sludge, comprising the following steps:
[0007] S1. Mix the Macleaya cordata extraction residue with sludge and stir to obtain microbubble sludge;
[0008] S2. Dry the microbubble sludge to obtain semi-dried sludge;
[0009] S3. Mix the Macleaya cordata extraction residue with the semi-dried sludge and press them into briquettes to obtain briquettes.
[0010] For the above method for preparing briquettes by using Macleaya cordata extraction residue and sludge, further improved, the Macleaya cordata extraction residue contains an additive; the additive is at least one of calcium oxide, attapulgite, and ammonium dihydrogen phosphate.
[0011] For the above method for preparing briquettes by using Macleaya cordata extraction residue and sludge, further improved, when the additive is a mixture of calcium oxide and attapulgite, the mass ratio of calcium oxide to attapulgite is 1∶1 - 2.
[0012] For the above method for preparing briquettes by using Macleaya cordata extraction residue and sludge, further improved, when the additive is a mixture of calcium oxide and ammonium dihydrogen phosphate, the mass ratio of calcium oxide to ammonium dihydrogen phosphate is 1∶1 - 2.
[0013] For the above method of using Macleaya cordata extraction residue and sludge to prepare briquettes, further improved, when the additive is a mixture of attapulgite and ammonium dihydrogen phosphate, the mass ratio of attapulgite to ammonium dihydrogen phosphate is 1:1.
[0014] For the above method of using Macleaya cordata extraction residue and sludge to prepare briquettes, further improved, when the additive is a mixture of calcium oxide, attapulgite and ammonium dihydrogen phosphate, the mass ratio of calcium oxide, attapulgite to ammonium dihydrogen phosphate is 1:1 - 2:1 - 2.
[0015] For the above method of using Macleaya cordata extraction residue and sludge to prepare briquettes, further improved, the method for obtaining the Macleaya cordata extraction residue includes the following steps:
[0016] (1) Make Macleaya cordata into Macleaya cordata powder;
[0017] (2) Mix the Macleaya cordata powder with the additive to obtain a mixed material;
[0018] (3) Add an ethanol solution to the mixed material for reflux extraction to obtain a Macleaya cordata extract and a Macleaya cordata extraction residue.
[0019] For the above method of using Macleaya cordata extraction residue and sludge to prepare briquettes, further improved, in step (1), the mesh number of the Macleaya cordata powder is 40 mesh - 80 mesh.
[0020] For the above method of using Macleaya cordata extraction residue and sludge to prepare briquettes, further improved, in step (2), the mass percentage content of the additive in the mixed material is 10wt% - 15wt%.
[0021] For the above method of using Macleaya cordata extraction residue and sludge to prepare briquettes, further improved, in step (3), the material - liquid ratio of the mixed material to the ethanol solution is 5mL / g - 10mL / g; the mass concentration of the ethanol solution is 90%; the number of times of reflux extraction is 2 times.
[0022] For the above method of using Macleaya cordata extraction residue and sludge to prepare briquettes, further improved, in step S1, the sludge is the excess sludge generated by a sewage treatment plant; the moisture content of the sludge is 80%; the mass percentage content of Macleaya cordata extraction residue in the micro - bubble sludge is 5wt%.
[0023] For the above method of using Macleaya cordata extraction residue and sludge to prepare briquette fuel, further improved, in step S1, the stirring is carried out first at a self-rotation speed of 30 r / min to 50 r / min and a revolution speed of 110 r / min to 140 r / min for 3 min to 5 min, and then at a self-rotation speed of 160 r / min to 200 r / min and a revolution speed of 400 r / min to 450 r / min for 15 min to 25 min until the sludge density is reduced to 0.55 g / cm 3 ~0.75 g / cm 3 , obtaining microbubble sludge.
[0024] For the above method of using Macleaya cordata extraction residue and sludge to prepare briquette fuel, further improved, in step S2, the drying is to lay the microbubble sludge in a drying device so that the thickness of the microbubble sludge is 10 mm to 30 mm, and place the microbubble sludge in an oven at 60 °C for heating for 2 h to 3 h until the surface microbubbles completely disappear, obtaining semi-dried sludge; the moisture content of the semi-dried sludge is 40% to 60%.
[0025] For the above method of using Macleaya cordata extraction residue and sludge to prepare briquette fuel, further improved, in step S3, the mass ratio of Macleaya cordata extraction residue to semi-dried sludge is 3:7 to 8:2; after mixing the Macleaya cordata extraction residue and semi-dried sludge, the following treatment is also included: standing the mixture of Macleaya cordata extraction residue and semi-dried sludge until the moisture content is 15%; during the briquetting process, the temperature is 110 °C to 170 °C and the pressure is 2 kN to 4 kN.
[0026] For the above method of using Macleaya cordata extraction residue and sludge to prepare briquette fuel, further improved, in step S3, during the briquetting process, the temperature is 170 °C and the pressure is 2 kN.
[0027] Compared with the prior art, the advantages of the present invention are:
[0028] (1) In the present invention, taking the Macleaya cordata extraction residue and sludge as raw materials to prepare briquettes, the Macleaya cordata itself contains a large amount of lignin, cellulose and hemicellulose, which are combined with the high protein in the sludge. By stirring, microbubble sludge with a large specific surface area can be formed, thus increasing the contact area between the sludge and air. Then, by drying the microbubble sludge, the moisture content of the sludge can be rapidly reduced. While effectively reducing the energy consumption of sludge drying, the moisture content of the sludge can also be effectively reduced, and it will not cause a significant reduction in the organic matter content, which is beneficial to retaining the calorific value of combustion to the greatest extent. At the same time, using the lignin, cellulose and hemicellulose contained in the Macleaya cordata itself and the high protein in the sludge as a binder, briquettes with a formed effect can be prepared without adding a binder, and it is beneficial to improve the energy density of the briquettes. Finally, it is beneficial to obtain briquettes with low energy consumption and high energy density. At the same time, it also has the advantages of simple process, convenient operation, low cost, high preparation efficiency, no risk of secondary pollution, etc., is suitable for large-scale preparation, and is convenient for industrial application.
[0029] (2) In the present invention, the briquettes prepared from the Macleaya cordata extraction residue and sludge as raw materials can utilize the additives (such as calcium oxide, attapulgite, etc.) contained in the Macleaya cordata extraction residue, which can significantly reduce the production of polluting gases and particulate matter. Specifically, during the combustion process, the additives contained in the Macleaya cordata extraction residue can adsorb polluting gases such as NO and SO2 by virtue of their rich pore structure, thus being beneficial to reducing the emissions of polluting gases such as NO and SO2. At the same time, these additives will promote the transformation of ultrafine particulate matter in the fuel into larger particulate matter, thereby reducing the production of particulate matter. In particular, it can significantly reduce the production of ultrafine particulate matter PM 0.1 . During combustion, the emissions of nitrogen oxides (mainly NO) are reduced by 22%, the nitrogen conversion rate is reduced from 2.13% to 1.67%, the sulfur oxides (mainly SO2) are reduced by 23%, and the sulfur conversion rate is reduced from 28.59% to 21.95%. The emissions of PM 0.1 , PM 1-2.5 , PM 2.5-10 are reduced, and the maximum reduction rate is 78.3%. In addition, in the present invention, the additives (such as calcium oxide, attapulgite, etc.) contained in the Macleaya cordata extraction residue can be utilized to reduce the forming energy consumption and increase the particle density. In particular, by increasing the particle density, it is also beneficial to reduce the emissions of particulate matter.
[0030] (3) In the present invention, in the method for obtaining the Macleaya cordata extraction residue, by adding additives (such as calcium oxide, attapulgite, etc.), the destruction effect on the Macleaya cordata cell wall can be strengthened, which is beneficial to realizing the full contact between the extraction solvent and the components inside the Macleaya cordata cells, and further beneficial to improving the yield and activity of the Macleaya cordata extract. At the same time, compared with ultrasonic extraction and extraction under heating and pressure, the extraction cost of the method of the present invention is lower.
[0031] Therefore, the method for preparing molded fuel from Macleaya cordata extraction residue and sludge according to the present invention has the advantages of simple process, convenient operation, low cost, high preparation efficiency, low energy consumption, high energy density, low production of polluting gases and particulate matter, etc. It is suitable for large-scale preparation, facilitates industrial application, is conducive to realizing the reduction and resource utilization of Macleaya cordata extraction residue and sludge, has high benefits and good application prospects. Description of the Drawings
[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
[0033] Figure 1 It is the process flow diagram for preparing molded fuel from Macleaya cordata extraction residue and sludge in Example 1 of the present invention.
[0034] Figure 2 It is the physical diagram of the molded fuel prepared in Example 1 and Comparative Example 1 of the present invention.
[0035] Figure 3 It is the extrusion energy consumption diagram of the molded fuel prepared from Macleaya cordata extraction residue (ADP, CaO, AT, ③) and sludge in Example 1 and Comparative Example 1 of the present invention.
[0036] Figure 4 It is the extrusion energy consumption diagram of the molded fuel prepared from Macleaya cordata extraction residue (ADP, CaO, AT, ③) and sludge in Example 1 and Comparative Example 1 of the present invention.
[0037] Figure 5 It is the density diagram of the molded fuel prepared from Macleaya cordata extraction residue (ADP, CaO, AT, ③) and sludge in Example 1 and Comparative Example 1 of the present invention.
[0038] Figure 6 It is the comparison diagram of SO2 emissions during the combustion of the molded fuel prepared from Macleaya cordata extraction residue (ADP, CaO, AT, ③) and sludge in Example 1 and Comparative Example 1 of the present invention.
[0039] Figure 7 It is the comparison diagram of NO emissions during the combustion of the molded fuel prepared from Macleaya cordata extraction residue (ADP, CaO, AT, ③) and sludge in Example 1 and Comparative Example 1 of the present invention.
[0040] Figure 8 It is the comparison diagram of particulate matter emissions during the combustion of the molded fuel prepared from Macleaya cordata extraction residue (ADP, CaO, AT, ③) and sludge in Example 1 and Comparative Example 1 of the present invention.
[0041] Figure 9This is a density control chart of the formed fuel prepared under the conditions of different mass ratios of Macleaya cordata extraction residue (CaO) to semi-dried sludge in Example 2 of the present invention. Detailed implementation manners
[0042] The present invention will be further described below in conjunction with the accompanying drawings of the specification and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.
[0043] The materials and instruments used in the following examples are all commercially available.
[0044] Example 1:
[0045] A method for preparing formed fuel using Macleaya cordata extraction residue and sludge, the process flow chart of which is as Figure 1 shown, including the following steps:
[0046] S1. Mix and stir the Macleaya cordata extraction residue (CaO) and sludge. Specifically, place the mixture sample of Macleaya cordata extraction residue and sludge in a blender, first perform slow stirring for 4 min at a self-rotation speed of 40 ± 5 r / min and a revolution speed of 120 ± 5 r / min, and then perform fast stirring for 20 min at a self-rotation speed of 160 ± 5 r / min and a revolution speed of 400 ± 5 r / min. Stop stirring until the sludge density is reduced to 0.75 g / cm 3 , and obtain microbubble sludge.
[0047] In step S1, the sludge used is excess sludge with a water content of 80%; the mass percentage content of Macleaya cordata extraction residue in the microbubble sludge is 5 wt%.
[0048] S2. Dry the microbubble sludge. Specifically, put the microbubble sludge into a drying device, with a laid thickness of 10 mm, and heat it in an oven at 60 °C for 2.5 h until the surface microbubbles completely disappear, and obtain semi-dried sludge with a water content of 50%.
[0049] S3. Mix and press the Macleaya cordata extraction residue (CaO) and semi-dried sludge into shape. Specifically, according to a mass ratio of 2:3, mix the Macleaya cordata extraction residue and semi-dried sludge, stir evenly, then place the mixture of Macleaya cordata extraction residue and semi-dried sludge in a refrigerator at 4 - 5 °C and let it stand for 48 h to make the moisture in the material mix evenly until the water content is 15%. Finally, place the mixture in a molding agent and perform extrusion molding at a pressure of 2 kN and a temperature of 110 °C. During the extrusion stage, the extrusion moving rate of the molding machine is 5 mm / min, and during the extrusion stage, the pushing moving rate is 2 mm / min, to obtain formed fuel. The formed fuel is in granular form with a particle size of 5.0 mm to 7.0 mm.
[0050] In this embodiment, the Macleaya cordata extraction residue (CaO) used contains an additive, and the additive is calcium oxide.
[0051] In this embodiment, the method for obtaining the Macleaya cordata extraction residue (CaO) includes the following steps:
[0052] (1) Make Macleaya cordata into Macleaya cordata powder. Specifically: wash and dry Macleaya cordata, then crush and sieve it to obtain Macleaya cordata powder with a mesh size of 40 - 80.
[0053] (2) Mix the Macleaya cordata powder with the additive and stir evenly to obtain a mixed material. The additive in this mixed material is calcium oxide, and its mass percentage is 10wt%.
[0054] (3) According to a solid - liquid ratio of 5 mL / g, add an ethanol solution with a concentration of 90% to the mixed material for reflux extraction twice to obtain Macleaya cordata extract and Macleaya cordata extraction residue, where the Macleaya cordata extraction residue is denoted as CaO.
[0055] In this embodiment, different shaped fuels were also prepared using Macleaya cordata extraction residues with different additives. These Macleaya cordata extraction residues with different additives are numbered ADP, AT, and ③ in sequence. Their corresponding additives are ammonium dihydrogen phosphate, attapulgite, and a composite additive of ammonium dihydrogen phosphate, limestone, and attapulgite (in this composite additive, the mass ratio of calcium oxide, attapulgite, and ammonium dihydrogen phosphate is 1∶1∶1). The above - mentioned Macleaya cordata extraction residues (ADP, AT, ③), except for the different types of additives contained, are exactly the same as the Macleaya cordata extraction residue (CaO) in other conditions.
[0056] Comparative Example 1
[0057] A method for preparing a shaped fuel using Macleaya cordata extraction residue and sludge is basically the same as that in Example 1, except that: the Macleaya cordata extraction residue used in Comparative Example 1 does not contain an additive, that is, no additive is added in the method for obtaining the Macleaya cordata extraction residue.
[0058] The shaped fuels prepared in Example 1 and Comparative Example 1 were tested, and the results are as Figure 2-8 shown in Table 1.
[0059] Figure 2 This is a physical diagram of the shaped fuels prepared in Example 1 and Comparative Example 1 of the present invention. Figure 2 Among them, the left figure is for Example 1, and the right figure is for Comparative Example 1. As Figure 2 can be seen, compared with Comparative Example 1, the shaped fuel prepared from the Macleaya cordata extraction residue containing calcium oxide as the raw material in the present invention has a smooth surface without break marks and a better shaping effect.
[0060] Figure 3Extrusion energy consumption diagram of the formed fuel prepared from the Macleaya cordata extraction residue (ADP, CaO, AT, ③) and sludge in Example 1 and Comparative Example 1 of the present invention.
[0061] Figure 4 Extrusion energy consumption diagram of the formed fuel prepared from the Macleaya cordata extraction residue (ADP, CaO, AT, ③) and sludge in Example 1 and Comparative Example 1 of the present invention.
[0062] Figure 5 Density diagram of the formed fuel prepared from the Macleaya cordata extraction residue (ADP, CaO, AT, ③) and sludge in Example 1 and Comparative Example 1 of the present invention. It can be found from Figure 3-5 that after adding the additive, the forming energy consumption (extrusion energy consumption and extrusion energy consumption) of the formed particles is reduced compared with Comparative Example 1, which is beneficial to reducing costs. And the density of the formed particles also increases, from 0.996 g / cm 3 to 1.104 - 1.108 g / cm 3 , meeting the national standard for formed fuel. The increase in particle density is also beneficial to reducing the costs during particle transportation and storage.
[0063] Figure 6 SO2 emission comparison diagram of the formed fuel prepared from the Macleaya cordata extraction residue (ADP, CaO, AT, ③) and sludge in Example 1 and Comparative Example 1 of the present invention during combustion.
[0064] Figure 7 NO emission comparison diagram of the formed fuel prepared from the Macleaya cordata extraction residue (ADP, CaO, AT, ③) and sludge in Example 1 and Comparative Example 1 of the present invention during combustion. It can be seen from Figure 6 and Figure 7 that in terms of SO2 emissions, the groups of calcium oxide, attapulgite and composite additives have good emission reduction effects, reducing the sulfur conversion rate from 2.86% to a minimum of 2.19%. Ammonium dihydrogen phosphate also reduces the sulfur conversion rate to 2.73%. Ammonium dihydrogen phosphate, calcium oxide and attapulgite have excellent NO emission reduction effects, and can reduce the nitrogen conversion rate from 4.6% to 3.8% at the lowest.
[0065] Figure 8 Particle emission comparison diagram of the formed fuel prepared from the Macleaya cordata extraction residue (ADP, CaO, AT, ③) and sludge in Example 1 and Comparative Example 1 of the present invention during combustion. It can be seen from Figure 8 that in terms of particle emission reduction, except for a slight increase in PM1, all additives effectively reduce PM 0.1 , PM 1-2.5 , PM 2.5-10 , among which the best effect is achieved by the attapulgite group for PM 1-2.5The emission reduction can reach 78.3%, with significant effects. It can be seen that after adding the additive, the yields of PM 0.1 and PM 2.5-10 decrease significantly, which can reduce environmental pollution during combustion.
[0066] Table 1 shows the comparative data of the leaching rates of active ingredients in Macleaya cordata extracts prepared under different additive conditions in Example 1 and Comparative Example 1 of the present invention.
[0067]
[0068] As can be seen from Table 1, in the present invention, the addition of the additive can promote the destruction of the cell wall of Macleaya cordata, resulting in an increase in the leaching rate of active ingredients in the Macleaya cordata extract. Among them, sanguinarine increased from 59.22% to 62.24% - 66.51%, and the extraction rate of chelerythrine also increased from 58.75% to 61.59% - 65.88%. It can be seen that the preparation method of Macleaya cordata extraction residue adopted in the present invention effectively improves the leaching rate of Macleaya cordata raw materials and reduces costs.
[0069] Example 2
[0070] A method for preparing briquettes using Macleaya cordata extraction residue and sludge is basically the same as that in Example 1, except that: the mass ratio of Macleaya cordata extraction residue (CaO) to semi-dried sludge is different.
[0071] In Example 2, when the mass ratio of Macleaya cordata extraction residue (CaO) to semi-dried sludge is 4:1, 7:3, 3:2, 1:1, 2:3, and 3:7 in turn, the corresponding test numbers are: M8S2, M7S3, M6S4, M5S5, M4S6, and M3S7.
[0072] Figure 9 is a density control chart of briquettes prepared under different mass ratios of Macleaya cordata extraction residue (CaO) to semi-dried sludge in Example 2 of the present invention. As Figure 9 can be seen, the density of the briquette will increase with the increase in the proportion of semi-dried sludge and reach the maximum value when the proportion of semi-dried sludge is 60%.
[0073] From the above results, compared with the conventional method for preparing sludge briquettes, the method for preparing briquettes using Macleaya cordata extraction residue and sludge in the present invention uses Macleaya cordata extraction residue and sludge as raw materials, and through stirring, drying treatment, and briquetting, briquettes with high energy density, low production of polluting gases and particulate matter can be prepared. At the same time, this method also has the advantages of simple process, convenient operation, low cost, high preparation efficiency, low energy consumption, no secondary pollution, etc., is suitable for large-scale preparation, is convenient for industrial application, is conducive to realizing the reduction and resource utilization of Macleaya cordata extraction residue and sludge, has high benefits, and has good application prospects.
[0074] The above embodiments are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.
Claims
1. A method for preparing molded fuel by using the extraction residue and sludge of Macleaya cordata, which is characterized in that, It includes the following steps: S1. Mix the Macleaya cordata extraction residue with sludge and stir to obtain microbubble sludge. S2. Dry the microbubble sludge to obtain semi-dried sludge. S3. Mix the Macleaya cordata extraction residue with the semi-dried sludge and press them into shape to obtain formed fuel.
2. The method for preparing molded fuel by using the extraction residue and sludge of Macleaya cordata according to claim 1, characterized in that The Macleaya cordata extraction residue contains an additive; the additive is at least one of calcium oxide, attapulgite, and ammonium dihydrogen phosphate.
3. The method for preparing molded fuel by using the extraction residue and sludge of Macleaya cordata according to claim 2, characterized in that When the additive is a mixture of calcium oxide and attapulgite, the mass ratio of calcium oxide to attapulgite is 1:1 - 2. When the additive is a mixture of calcium oxide and ammonium dihydrogen phosphate, the mass ratio of calcium oxide to ammonium dihydrogen phosphate is 1:1 - 2. When the additive is a mixture of attapulgite and ammonium dihydrogen phosphate, the mass ratio of attapulgite to ammonium dihydrogen phosphate is 1:
1. When the additive is a mixture of calcium oxide, attapulgite, and ammonium dihydrogen phosphate, the mass ratio of calcium oxide, attapulgite, and ammonium dihydrogen phosphate is 1:1 - 2:1 - 2.
4. The method for preparing molded fuel by using the extraction residue and sludge of Macleaya cordata according to claim 3, characterized in that, The method for obtaining the Macleaya cordata extraction residue includes the following steps: (1) Make Macleaya cordata into Macleaya cordata powder. (2) Mix the Macleaya cordata powder with an additive to obtain a mixed material. (3) Add an ethanol solution to the mixed material for reflux extraction to obtain a Macleaya cordata extract and a Macleaya cordata extraction residue.
5. The method for preparing molded fuel by using the extraction residue and sludge of Macleaya cordata according to claim 4, wherein In step (1), the mesh number of the Macleaya cordata powder is 40 - 80 meshes. In step (2), the mass percentage content of the additive in the mixed material is 10wt% - 15wt%. In step (3), the material-liquid ratio of the mixed material to the ethanol solution is 5mL / g - 10mL / g; the mass concentration of the ethanol solution is 90%; the number of times of reflux extraction is 2 times.
6. The method for preparing a formed fuel by using the extraction residue and sludge of Macleaya cordata according to any one of claims 1 to 5, characterized in that, In step S1, the sludge is the surplus sludge generated by a sewage treatment plant; the water content of the sludge is 80%; the mass percentage content of the Macleaya cordata extraction residue in the microbubble sludge is 5wt%.
7. The method for preparing molded fuel by using the extraction residue and sludge of Macleaya cordata according to claim 6, characterized in that, In step S1, the stirring is first carried out at a self-rotation speed of 30 r / min to 50 r / min and a revolution speed of 110 r / min to 140 r / min for 3 min to 5 min, and then at a self-rotation speed of 160 r / min to 200 r / min and a revolution speed of 400 r / min to 450 r / min for 15 min to 25 min until the sludge density is reduced to 0.55 g / cm 3 ~0.75 g / cm 3 , and microbubble sludge is obtained.
8. The method for preparing a molded fuel by using the extraction residue and sludge of Macleaya cordata according to any one of claims 1 to 5, characterized in that, In step S2, the drying is to lay the microbubble sludge in a drying device so that the thickness of the microbubble sludge is 10mm - 30mm, and place the microbubble sludge in an oven at 60°C for heating for 2h - 3h until the surface microbubbles completely disappear to obtain semi-dried sludge; the water content of the semi-dried sludge is 40% - 60%.
9. The method for preparing a formed fuel by using the extraction residue and sludge of Macleaya cordata according to any one of claims 1 to 5, characterized in that, In step S3, the mass ratio of the Macleaya cordata extraction residue to the semi-dried sludge is 3:7 - 8:2; after mixing the Macleaya cordata extraction residue and the semi-dried sludge, the following treatment is also included: let the mixture of the Macleaya cordata extraction residue and the semi-dried sludge stand until the water content is 15%; during the process of pressing into shape, the temperature is 110°C - 170°C, and the pressure is 2kN - 4kN.
10. The method for preparing a molded fuel by using the extraction residue and sludge of Macleaya cordata according to claim 9, wherein, In step S3, during the process of pressing into shape, the temperature is 170°C and the pressure is 2kN.