Solid fuel prepared from erythromycin thiocyanate fungus residues as well as preparation method and application of solid fuel

Abstract

The invention belongs to the field of bio-pharmaceutical post-treatment, and particularly relates to a solid fuel prepared from erythromycin thiocyanate fungus residues as well as a preparation method and application of the solid fuel. The invention provides a solid fuel prepared from erythromycin thiocyanate residues, which is characterized in that the erythromycin thiocyanate residues are subjected to flocculation, filter pressing and secondary drying to obtain a dry material with the water content of 25-35%, and the dry material is prepared into low-temperature solid fuel particles through solid fuel equipment. The prepared fuel particles have the length of 20-100 mm, the diameter of 6 mm, the water content of 14-20% and the calorific value of 3500-5000 kilocalories, and can be used for solid oxide fuel cells, fixed power generation and cogeneration. The environment pollution can be reduced, the value can be extracted from the waste, the cyclic utilization of resources is realized, the recycling of the antibiotic waste is further promoted, and the prospect is good.

Description

Technical Field

[0001] The present invention belongs to the field of post-treatment of biopharmaceuticals, and particularly relates to a solid fuel prepared from erythromycin thiocyanate bacterial residue, a preparation method thereof, and uses thereof. Background Art

[0002] Today, with the development of medicine, antibiotic drugs play an essential role. In China, the usage rate of antibiotic drugs reaches 70%. At the same time, China is also a major producer and exporter of antibiotic raw materials globally. In 2009, the output of antibiotic drugs in China reached 1.47 million tons, while the generated antibiotic bacterial residue was 13 million tons. Antibiotic bacterial residue contains residual antibiotics and metabolic intermediates, etc., and is a special kind of hazardous waste. If disposed of improperly, it will pose potential hazards to the ecological environment and human health, and its hazards have characteristics such as concealment, lag, accumulation, synergy, and connection. The most primitive methods of incineration and landfill not only cannot solve the bacterial residue but also increase the extra transportation and labor costs.

[0003] Currently, hydrothermal technology, supercritical water gasification technology, etc. are used for the harmless or reduction treatment of antibiotic bacterial residue to produce solid biofuels, realizing the resource utilization of environmental pollutants and being an important link in the green circular economy industrial chain. However, the current operation technologies still have problems such as relying on high temperature and high pressure and high cost, which are not conducive to large-scale industrial development and promotion.

[0004] Therefore, it is difficult for the existing technology to obtain a solid fuel made from antibiotic bacterial residue with low water content and high calorific value at low cost and mild conditions, which limits the resource reuse of antibiotic bacterial residue and is not conducive to the development of the green circular economy industry. Summary of the Invention

[0005] Aiming at the defects of the existing technology, the present invention provides a solid fuel prepared from erythromycin thiocyanate bacterial residue, a preparation method thereof, and uses thereof.

[0006] The present invention provides a solid fuel prepared from erythromycin thiocyanate bacterial residue, which is prepared by transferring the dry material made from erythromycin thiocyanate bacterial residue to a solid fuel device;

[0007] The moisture content of the dry material is 25% - 35%.

[0008] Preferably, the dry material is prepared by including the following steps:

[0009] Step 1, mixing an erythromycin thiocyanate bacterial residue aqueous solution with a plate-frame dechaining and flocculating agent solution to obtain a flocculated mixture;

[0010] Step 2, subjecting the flocculated mixture to pressure filtration by a plate-frame filter press to obtain the filtered bacterial residue;

[0011] Step 3: Dry the filtered bacterial residue with a dryer and then with a disk dryer to obtain the product.

[0012] The drying time with the dryer is 1.5 - 2.0 h.

[0013] Preferably, the drying temperature with the disk dryer in Step 3 is 85 - 105 °C.

[0014] Preferably, the volume concentration of the aqueous solution of erythromycin thiocyanate bacterial residue in Step 1 is 16% - 18%; and / or, the mixing in Step 1 is carried out with stirring in a mixing tank at 20 - 25 Hz.

[0015] and / or, the pressing pressure of the plate and frame filter press in Step 2 is 1.2 MPa.

[0016] and / or, the operating frequency of the hot water pump of the dryer in Step 3 is 40 - 45 Hz; and / or, the hot air temperature of each unit of the dryer in Step 3 is 70 - 78 °C.

[0017] Preferably, the steam pressure of the dryer in Step 3 ≥ 0.4 MPa; and / or, the instrument air pressure of the dryer in Step 3 is 0.5 - 0.6 MPa.

[0018] Preferably, for the solid fuel as described in any of the above, the specific operation of the dry material in the solid fuel equipment is to suck the dry material into the main tower under negative pressure, enter the buffer bin through the distributing screw conveyor, and be conveyed to the die of the granulation unit through the forced feeder to obtain the product.

[0019] Preferably, the negative pressure is obtained by a Roots blower and a dust collector blower device, and the frequency of the Roots blower is 45 - 50 Hz.

[0020] Preferably, the frequency of the forced feeder is 10 Hz.

[0021] The present invention provides a preparation method for the solid fuel as described in any of the above, which includes: transferring the dry material made from erythromycin thiocyanate bacterial residue to the solid fuel equipment to obtain the product; the moisture content of the dry material is 25% - 35%.

[0022] The present invention provides the use of the solid fuel as described in any of the above in solid oxide fuel cells, fixed power generation, and combined heat and power generation devices.

[0023] The present invention provides a solid fuel prepared from the residues of erythromycin thiocyanate bacteria. By screening the conditions in the preparation process, after the residues of erythromycin thiocyanate bacteria are treated through steps of flocculation, pressure filtration, and secondary drying, the water content of the obtained dry material is 25% - 35%. The dry material is made into low-temperature solid fuel pellets through a solid fuel device. This method is simple to operate. The fuel pellets prepared have a length of 20 - 100 mm, a diameter of 6 mm, a water content of 14 - 20%, a calorific value of 3500 - 5000 kcal, and a working temperature range of 120 - 130 °C, and can be used in solid oxide fuel cells, fixed power generation, and combined heat and power generation. This not only helps to reduce environmental pollution, but also extracts value from waste, realizes the recycling of resources, and further promotes the reuse of antibiotic waste.

[0024] Obviously, based on the above content of the present invention, according to the common general knowledge and customary means in the art, without departing from the above basic technical idea of the present invention, various other forms of modifications, substitutions, or changes can also be made.

[0025] The following is a further detailed description of the above content of the present invention through specific embodiments in the form of examples. However, this should not be understood as limiting the scope of the above subject matter of the present invention to the following examples. All technologies implemented based on the above content of the present invention belong to the scope of the present invention. Specific Embodiments

[0026] In the following examples and experimental examples, reagents and materials not specifically stated are all commercially available products.

[0027] The plate and frame filter press used in the present invention is a product of Shandong Jingjin Environmental Protection Equipment Co., Ltd., with the model XAZGFQ710 / 2000-U; the dryer is a product of Guangdong Shengqi Energy Equipment Co., Ltd., with the model SBWHD45000; the disk dryer is a product of Jingjiang Xinsheng Environmental Protection Technology Co., Ltd., with the model P-3200-15. The plate and frame dechaining flocculant (PAM) used in the present invention is a product of Jiangsu Jingtong New Environmental Protection Materials Co., Ltd., with the model BQZ-532.

[0028] The granulator of the solid fuel device has a model of 420, a die hole diameter of 6 mm, a compression ratio of 5.0, a power of 110 kw, the model of the Roots blower is CYT-780A-1, the air volume is 21000 m 3 / h, the total pressure is 2000 pa, the power is 15 kw, the rotation speed is 1450 r / min, the air volume of the dust collector blower is 36916 m 3 / h, the total pressure is 2000 pa, the power is 15 kw, the rotation speed is 1450 r / min.

[0029] The remaining raw materials and equipment used in the present invention are all known products, obtained by purchasing commercially available products.

[0030] Solid fuel prepared from the residue of erythromycin thiocyanate bacteria and its preparation method in Example 1

[0031] The solid fuel of this example is prepared by the following method:

[0032] I. Treatment method of the residue of erythromycin thiocyanate bacteria

[0033] (1) Flocculation

[0034] Mix the residue of erythromycin thiocyanate bacteria with primary water at a volume ratio of 1:5, and then mix it with the plate-frame dechaining flocculant solution (the concentration of the plate-frame dechaining flocculant solution is 5‰, and the solvent of the solution is water) at a volume ratio of 1:0.2. At this time, the mixer in the mixing tank is turned on to 25 Hz, and the bacteria residue shows flocculation.

[0035] (2) Pressure filtration

[0036] Feed the above-mentioned flocculated mixture into a plate-frame filter press through low and high pressure pumps for pressure filtration. The pressure of low-pressure feeding is 0.06 MPa, the pressure of high-pressure feeding is 1 MPa, and the pressing pressure after the plate-frame is fed is 1.2 MPa. Pressure filtration can separate the bacteria residue from water. Observe the filtrate. If it is clear, it can be recycled for flocculation again; if it is turbid, it is discharged.

[0037] (3) Primary drying

[0038] The bacteria residue enters the dryer for drying. The hot water temperature of the dryer is 80 °C, the operating frequency of the hot water pump is 45 Hz, the hot air temperature of each unit is 70 °C - 78 °C, and the lower belt, upper belt, cutting machine, double helix, and bucket elevator are started in sequence; the steam pressure is greater than or equal to 0.4 MPa, and the instrument air pressure of the dryer is 0.5 MPa - 0.6 MPa. The drying time in the dryer is 1.5 h. The moisture content of the bacteria residue before entering the dryer is 50% - 60%, and the moisture content after leaving the dryer is 43%.

[0039] (4) Secondary drying

[0040] The bacteria residue dried by the dryer is subjected to secondary drying by a disk dryer (the disk temperature is 85 - 105 °C) to obtain dry material, and the moisture content of the dry material is 30%.

[0041] II. Preparation method of fuel particles

[0042] (1) Feeding

[0043] Transfer the dry material to the solid fuel equipment site by a transfer vehicle. The roots blower and the dust collector blower provide negative pressure for the unit. The frequency of the roots blower is 50 Hz. After running stably, the vacuum feeding pump sucks the dry material into the main tower through the vacuum feeding pipe under negative pressure.

[0044] (2) Material distribution

[0045] After the dry materials are sucked into the main tower, they naturally fall onto the feeding screw conveyor, which evenly feeds the dry materials into each buffer bin of the granulation unit.

[0046] (3) Feeding and granulation

[0047] Adjust the frequency of the forced feeder to 10 Hz, feed the dry materials in the buffer bin into the forced feeder, and the forced feeder transports the materials to the die of the granulation unit for centrifugal compression to obtain the product. The length of the produced granules is 20 - 100 mm, the diameter is 6 mm, and the water content is 18%.

[0048] Example 2 Solid fuel prepared from erythromycin thiocyanate bacterial residue and its preparation method

[0049] Prepare the solid fuel according to the method of Example 1, with the difference that: the drying time in the dryer is 2.0 h. After the first drying, the water content of the dry materials is 40%; after the second drying, the water content of the dry materials is 25 - 35%.

[0050] The technical solution of the present invention will be further described through experiments below. The solid fuel particles detected in the following experimental examples are prepared by the method of Example 1.

[0051] Experimental Example 1 Study on the properties of solid fuel particles prepared from bacterial residue

[0052] I. Experimental method

[0053] 1. Determination of the size of fuel particles

[0054] Determine the length and diameter of the particles according to the international standard ISO 17829:2015EN.

[0055] 2. Determination of the water content of fuel particles

[0056] Determine the water content of the fuel particles by the oven drying weight loss method.

[0057] 3. Determination of the calorific value of fuel particles

[0058] Determine the calorific value of the fuel particles by the oxygen bomb calorimetry method.

[0059] 4. Determination of the working temperature of fuel particles

[0060] Refer to the national standard GB / T34964 - 2017 "Test method for combustion performance of biomass pellet fuel".

[0061] II. Experimental results

[0062] Under the preferred conditions of the present invention, the obtained solid particles have a length of 20 - 100 mm, a diameter of 6 mm, a moisture content of 14 - 20%, a calorific value of 3500 - 5000 kcal, and an operating temperature range of 120 - 130°C. It shows that the solid particles obtained by the present invention can be used as low-temperature solid fuels.

[0063] Study on the properties of fuel particles under different process conditions in Experimental Example 2

[0064] I. Experimental method

[0065] Prepare solid fuel particles according to the preparation method of Example 1, with the difference that: during the first drying, the drying time in the dryer is 1.2 hours; during the second drying, the disc temperature is 65 - 75°C.

[0066] During the preparation process, measure the moisture content of the bacterial residue and the dry material respectively.

[0067] II. Experimental results

[0068] The experimental results show that the moisture content of the bacterial residue before entering the dryer is 60%, and the moisture content of the bacterial residue after leaving the dryer is 45%. After the dry material enters the solid granulator, the moisture content is above 35%, the dry material pastes the mold, and the discharged material is not formed.

[0069] The results show that due to the lack of control of the moisture content of the bacterial residue before entering the dryer and the failure to increase the disc temperature, the moisture content of the material entering the granulator mold of the solid fuel machine is high, the mold is pasted, and the discharged material is not formed. It proves that the disc temperature is important for preparing the bacterial residue into solid fuel particles; when the moisture content of the dry material prepared from the bacterial residue is above 35%, the discharged material is not formed.

[0070] Study on the properties of fuel particles under different process conditions in Experimental Example 3

[0071] I. Experimental method

[0072] Prepare solid fuel particles according to the preparation method of Example 1, with the difference that: during the first drying, the drying time in the dryer is 1.2 hours.

[0073] During the preparation process, measure the moisture content of the bacterial residue and the dry material respectively.

[0074] II. Experimental results

[0075] The experimental results show that the moisture content of the dry material after the second drying is 38%, the dry material pastes the mold, and the discharged material is not formed.

[0076] The results show that the drying time of the bacterial residue in the dryer is important for preparing the bacterial residue into solid fuel particles; when the drying time is less than or equal to 1.5 hours, the moisture content is too high and the discharged material is not formed.

[0077] Study on the Properties of Fuel Particles under Different Process Conditions in Experimental Example 4

[0078] I. Experimental Method

[0079] Solid fuel particles were prepared according to the preparation method of Example 1, with the difference that: during the first drying, the drying time in the dryer was 2.1 hours.

[0080] During the preparation process, the moisture contents of the bacterial residue and the dry material were measured respectively.

[0081] II. Experimental Results

[0082] The experimental results showed that the moisture content of the bacterial residue before entering the dryer was 55%, the moisture content of the bacterial residue after leaving the dryer was below 25%, and the moisture content of the dry material after the second drying was 22%. After the dry material entered the solid granulator, the material was too dry and not formed.

[0083] The results indicated that too long drying time (greater than or equal to 2.1 h) in the dryer would cause the moisture content of the dry material made from the bacterial residue to be too low to form. It was proved that the drying time in the dryer was important for preparing solid fuel particles from the bacterial residue; when the moisture content of the dry material after the second drying was below 25%, the discharged material was not formed.

[0084] The results of the above experimental examples showed that only by increasing the disc temperature, the moisture content of the dry material after the second drying was above 35%, and solid fuel could not be successfully prepared. When the disc temperature was increased to 85 - 105 °C and the drying time in the dryer ≤ 1.2 h, resulting in the moisture content of the dry material after the second drying being above 35%; or when the drying time in the dryer ≥ 2.1 h, resulting in the moisture content of the dry material after the second drying being below 25%, due to the inappropriate moisture content of the dry material, solid fuel particles could not be successfully prepared. Therefore, when the disc temperature was increased to 85 - 105 °C, the drying time in the dryer was 1.5 - 2.0 hours, and the moisture content of the dry material prepared from the bacterial residue was between 25% - 35%, solid fuel particles could be successfully prepared from the erythromycin bacterial residue.

[0085] As can be seen from the above embodiments and experimental examples, the present invention provides a solid fuel prepared from erythromycin thiocyanate bacterial residue. By screening the conditions in the preparation process, after the erythromycin thiocyanate bacterial residue is treated through the steps of flocculation, pressure filtration, and secondary drying, the moisture content of the obtained dry material is 25% - 35%. The dry material is made into low-temperature solid fuel particles through a solid fuel device. This method is simple to operate. The fuel particles prepared have a length of 20 - 100 mm, a diameter of 6 mm, a moisture content of 14 - 20%, a calorific value of 3500 - 5000 kcal, and a working temperature range of 120 - 130 °C, and can be used in solid oxide fuel cells, stationary power generation, and combined heat and power generation. This not only helps to reduce environmental pollution, but also extracts value from waste, realizes the recycling of resources, and further promotes the reuse of antibiotic waste.

Claims

1. A solid fuel prepared from erythromycin thiocyanate residues, characterized in that: It is prepared by transferring the dry material made from erythromycin thiocyanate bacterial residue to a solid fuel device; The moisture content of the dry material is 25%-35%.

2. The solid fuel according to claim 1, characterized in that: The dry material is prepared by comprising the following steps: Step 1, mixing an aqueous solution of erythromycin thiocyanate bacterial residue with a plate-frame depolymerization coagulant solution to obtain a flocculated mixed solution; Step 2, the flocculated mixed solution is filtered through a plate and frame filter press to obtain filtered bacterial residue; Step 3, drying the filtered bacterial residue in a drying machine, and then drying in a disc dryer to obtain; The drying time in the drying machine is 1.5-2.0h.

3. The solid fuel according to claim 2, characterized in that: The drying temperature of the disc dryer in step 3 is 85-105°C.

4. The solid fuel according to claim 2, characterized in that: The volume concentration of the aqueous solution of erythromycin thiocyanate residue in step 1 is 16%-18%; and / or, the mixing in step 1 is mixing under stirring in a mixing tank at 20-25 Hz; And / or, the pressing pressure of the plate and frame filter press described in step 2 is 1.2 MPa; And / or, the operating frequency of the hot water pump of the drying machine described in step 3 is 40-45 Hz; and / or, the hot air temperature of each unit of the drying machine described in step 3 is 70-78°C.

5. The solid fuel according to claim 2, characterized in that: The steam pressure of the dryer described in step 3 is ≥0.4MPa; and / or the instrument gas pressure of the dryer described in step 3 is 0.5-0.6MPa.

6. The solid fuel according to any one of claims 1 to 5, characterized in that: The specific operation of the dry material in the solid fuel equipment is to suck the dry material into the main tower under negative pressure, pass through the material distribution screw conveyor, enter the buffer bin, and convey it to the pelletizing unit mold through the forced feeder.

7. The solid fuel according to claim 6, characterized in that: The negative pressure is obtained by a Roots blower and a dust collector blower device, and the frequency of the Roots blower is 45-50 Hz.

8. The solid fuel according to claim 6, characterized in that: The frequency of the forced feeder was 10 Hz.

9. The method for preparing the solid fuel according to any one of claims 1 to 8, characterized in that: It includes: The dry material made from erythromycin thiocyanate residue is transferred to solid fuel equipment to obtain the solid fuel; the moisture content of the dry material is 25%-35%.

10. Use of the solid fuel according to any one of claims 1 to 8 in solid oxide fuel cells, stationary power generation and combined heat and power devices.