Sludge / biomass mixed drying process

Abstract

The invention relates to a sludge / biomass mixed drying process, and belongs to the technical field of sludge treatment. Feeding the dewatered sludge, the biomass, the furfural modified diatomite, the isocyanatopropyltriethoxysilane and the stannous octoate into a double-shaft differential mixer, and uniformly mixing; discharging the mixed material from a discharge port of the double-shaft differential mixer, conveying the mixed material to a corrosion-resistant mesh belt conveyor, and uniformly spreading the material on a mesh belt to form a material layer; a hot air drying system is started, a hot air furnace generates low-temperature hot air, and the low-temperature hot air penetrates through a material layer from bottom to top for drying after being distributed through an air duct; wet and hot waste gas generated by drying firstly enters a condensation dehumidification device to remove moisture, then enters a heat recovery device to recover heat, and finally is discharged after being purified to reach the standard; the furfural modified diatomite is prepared from diatomite, absolute ethyl alcohol, furfural and hydrochloric acid; the moisture content of dried materials is low, and the materials are free of caking, uneven drying and the like.

Description

Technical Field

[0001] This invention relates to the field of sludge treatment technology, and in particular to a sludge / biomass mixed drying process. Background Technology

[0002] With the acceleration of industrialization and urbanization, the scale of wastewater treatment is constantly expanding, resulting in a sharp increase in the amount of sludge. Sludge has a complex composition, containing large amounts of water, organic matter, pathogens, heavy metals, and other substances. If not properly treated, and if it is arbitrarily dumped or discharged, it will cause serious pollution to soil, water bodies, and the atmosphere, threatening the ecological environment and human health. Therefore, the reduction, harmlessness, and resource utilization of sludge have become important issues in the field of environmental protection.

[0003] Sludge drying is a key step in achieving sludge reduction and resource utilization. By reducing the water content of sludge, its volume can be reduced, making it easier for subsequent transportation, disposal, and utilization, such as for incineration power generation and the production of organic fertilizer.

[0004] Chinese Patent CN106673392A discloses a low-temperature sludge drying process, which relates to the field of sludge drying technology. The process steps are as follows: wet sludge is crushed, extruded into strips, and then fed into a belt sludge drying chamber. After heat and mass exchange with hot drying circulating air, it becomes dry sludge. The hot drying circulating air becomes humid low-temperature circulating air. This humid low-temperature circulating air is drawn into a heat pump by a circulating fan and blown from the circulating fan into an intermediate heat exchanger to exchange heat with the evaporator exhaust air, further reducing its temperature. The air exits from the intermediate heat exchanger, passes through a water-cooled pre-cooling coil for further temperature reduction, and then passes through an evaporator for evaporation, resulting in condensate. The evaporator exhaust air then passes through an intermediate cooler to exchange heat with the heat pump return air, increasing its temperature before entering the condenser. After being heated, it becomes hot dry air and recirculates back into the belt sludge drying chamber for further processing.

[0005] Chinese Patent CN117247218B relates to the field of sludge dryer technology and discloses an automated sludge dryer, including a feeding hopper, a drying hopper fixedly installed at the right end of the feeding hopper, a heating hopper fixedly installed on the outside of the drying hopper, a squeezing and draining component and a filter assembly inside the feeding hopper, and a leveling component and a crushing component inside the drying hopper.

[0006] Existing sludge drying technologies have many drawbacks: On the one hand, sludge itself has a high water content and high viscosity, making it difficult to transfer heat effectively during drying, which can easily lead to uneven drying, scaling and blockage on the inner wall of the equipment, resulting in low drying efficiency and high energy consumption; on the other hand, if the wet and hot exhaust gas generated during the drying process is directly discharged, it will cause heat waste and secondary pollution, which does not meet the requirements of energy conservation and environmental protection. Summary of the Invention

[0007] To address the above problems, this invention provides a sludge / biomass mixed drying process, the operation steps of which are as follows: S1: According to the mass fractions, 10-30 parts of dewatered sludge, 5-15 parts of biomass with a particle size of 5-15mm, 0.1-1.0 parts of furfural-modified diatomaceous earth, 0.2-1 parts of propyltriethoxysilane isocyanate, and 0.1-1.0 parts of stannous octoate are fed into a twin-shaft differential mixer and mixed evenly. S2: The mixed material is discharged from the outlet of the twin-shaft differential speed mixer and sent to the corrosion-resistant mesh belt conveyor to spread the material evenly on the mesh belt to form a material layer; S3: Start the hot air drying system. The hot air furnace generates low-temperature hot air, which is distributed through the air duct and penetrates the material layer from bottom to top for drying. S4: The wet and hot exhaust gas generated during drying first enters the condensation and dehumidification device to remove moisture, then enters the heat recovery device to recover heat, and finally is discharged after purification treatment to meet the standards.

[0008] Furthermore, the biomass is straw or wood chips.

[0009] Furthermore, the two stirring shafts of the S1 dual-shaft differential mixer rotate at speeds of 50-80 rpm and 80-100 rpm respectively, in opposite directions, with a mixing time of 5-15 minutes, and paddle-type stirring blades are installed on the stirring shafts.

[0010] Furthermore, the S2 mesh belt is made of stainless steel wire mesh and operates at a speed of 0.5-1 meter / minute.

[0011] Furthermore, the thickness of the material layer in S2 is 5-15 cm.

[0012] Furthermore, the S3 low-temperature hot air temperature is 80-120℃, and the wind speed is 2-5 m / s.

[0013] Furthermore, the S3 drying time is 60-120 minutes, and the material layer is turned over every 20-30 minutes during the drying process.

[0014] Furthermore, the preparation method of the furfural-modified diatomaceous earth is as follows: According to the mass fractions, add 5-10 parts of diatomaceous earth, 25-35 parts of anhydrous ethanol, 1-4 parts of furfural, and 0.08-0.25 parts of hydrochloric acid to a reaction vessel and stir to react; after the reaction is completed, filter, wash 3-5 times with anhydrous ethanol, and vacuum dry to obtain furfural-modified diatomaceous earth.

[0015] Furthermore, the reaction temperature is 50-80℃, and the reaction time is 3-8 hours.

[0016] Furthermore, the vacuum drying temperature is 70-90℃, and the time is 3-6 hours.

[0017] Reaction mechanism: Furfural-modified diatomaceous earth and silane synergistic enhancement of looseness: The furan heterocycles in furfural undergo a condensation reaction with the hydroxyl groups on the surface of diatomaceous earth, forming a sterically hindered modified layer that disrupts the sludge bonding structure; propionic acid triethoxysilane undergoes an addition reaction with the hydroxyl groups of biomass, forming a hydrophobic layer that reduces interparticle adhesion. The synergistic effect of these two processes maintains the mixed material layer in a well-loose state, significantly improving hot air penetration efficiency.

[0018] Technical effect The use of a twin-shaft differential speed mixer to powerfully stir and knead sludge and biomass can achieve thorough mixing and form a porous and loose mixture. Combined with a hot air drying system, hot air can penetrate the material layer evenly. Combined with the turning operation, it can ensure that the material is heated evenly and effectively reduce the moisture content of the material.

[0019] The furfural used is inexpensive, and the modified diatomaceous earth can significantly improve the air permeability of the mixture layer and reduce the resistance to hot air penetration; this not only helps to control the cost of raw materials in the process, but also avoids the problem of material clumping after drying, thus meeting the requirements for subsequent treatment.

[0020] By leveraging the synergistic effect of furfural-modified diatomaceous earth and silane, coupled with a scientific drying process, uneven drying, a common problem in traditional drying processes, can be avoided, further optimizing the drying effect and ensuring the overall quality of the dried material. Attached Figure Description

[0021] Figure 1 This is a diagram of the raw materials for Example 1.

[0022] Figure 2 This is a diagram of the raw materials used in Example 3.

[0023] Figure 3 This is the dried powder sample from Example 1. Detailed Implementation

[0024] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description is provided in conjunction with embodiments and comparative examples: The raw material sludge is: Fuchun Ziguang sewage sludge, with the following specific components: Moisture content: Weigh the sample and record the mass as m1; then place it in an oven at 105±2℃ and dry for 24 hours. After cooling to room temperature, weigh the sample and record the mass as m2; calculate the moisture content = (m1-m2) / m1×100%.

[0025] Looseness: Observe the clumping of the sample. No clumping is excellent, slight clumping is good, and severe clumping is poor. Example 1

[0026] A sludge / biomass co-drying process, the operation steps of which are as follows: S1: 10kg of dewatered sludge, 5kg of biomass with a particle size of 5mm, 0.1kg of furfural-modified diatomaceous earth, 0.2kg of propyltriethoxysilane isocyanate (CAS: 24801-88-5), and 0.1kg of stannous octoate are fed into a twin-shaft differential mixer and mixed evenly. S2: The mixed material is discharged from the outlet of the twin-shaft differential speed mixer and sent to the corrosion-resistant mesh belt conveyor to spread the material evenly on the mesh belt to form a material layer; S3: Start the hot air drying system. The hot air furnace generates low-temperature hot air, which is distributed through the air duct and penetrates the material layer from bottom to top for drying. S4: The wet and hot exhaust gas generated during drying first enters the condensation and dehumidification device to remove moisture, then enters the heat recovery device to recover heat, and finally is discharged after purification treatment to meet the standards.

[0027] The biomass mentioned is straw.

[0028] The S1 dual-shaft differential mixer has two stirring shafts with speeds of 50 rpm and 80 rpm respectively, rotating in opposite directions, and a mixing time of 5 minutes. The stirring shafts are equipped with paddle-type stirring blades.

[0029] The S2 mesh belt is made of stainless steel wire mesh and operates at a speed of 0.5 meters per minute.

[0030] The thickness of the material layer in S2 is 5 cm.

[0031] The S3 low-temperature hot air temperature is 80℃ and the wind speed is 2 m / s.

[0032] The S3 drying time is 60 minutes, and the material layer is turned over every 20 minutes during the drying process.

[0033] The preparation method of the furfural-modified diatomaceous earth is as follows: 5 kg of diatomaceous earth, 25 kg of anhydrous ethanol, 1 kg of furfural, and 0.08 kg of hydrochloric acid were added to a reaction vessel and stirred to react. After the reaction was completed, the mixture was filtered, washed three times with anhydrous ethanol, and dried under vacuum to obtain furfural-modified diatomaceous earth.

[0034] The reaction temperature was 50°C and the reaction time was 3 hours.

[0035] The vacuum drying temperature is 70℃ and the time is 3 hours. Example 2

[0036] A sludge / biomass co-drying process, the operation steps of which are as follows: S1: 15kg of dewatered sludge, 8kg of biomass with a particle size of 10mm, 0.5kg of furfural-modified diatomaceous earth, 0.5kg of propyltriethoxysilane isocyanate (CAS: 24801-88-5), and 0.5kg of stannous octoate are fed into a twin-shaft differential mixer and mixed evenly. S2: The mixed material is discharged from the outlet of the twin-shaft differential speed mixer and sent to the corrosion-resistant mesh belt conveyor to spread the material evenly on the mesh belt to form a material layer; S3: Start the hot air drying system. The hot air furnace generates low-temperature hot air, which is distributed through the air duct and penetrates the material layer from bottom to top for drying. S4: The wet and hot exhaust gas generated during drying first enters the condensation and dehumidification device to remove moisture, then enters the heat recovery device to recover heat, and finally is discharged after purification treatment to meet the standards.

[0037] The biomass mentioned is straw.

[0038] The S1 dual-shaft differential mixer has two stirring shafts with rotational speeds of 60 rpm and 90 rpm respectively, rotating in opposite directions, and a mixing time of 10 minutes. Paddle-type stirring blades are installed on the stirring shafts.

[0039] The S2 mesh belt is made of stainless steel wire mesh and operates at a speed of 0.6 meters per minute.

[0040] The thickness of the material layer in S2 is 8 cm.

[0041] The S3 low-temperature hot air temperature is 90℃ and the wind speed is 3 m / s.

[0042] The S3 drying time is 80 minutes, and the material layer is turned over every 25 minutes during the drying process.

[0043] The preparation method of the furfural-modified diatomaceous earth is as follows: 6 kg of diatomaceous earth, 28 kg of anhydrous ethanol, 2 kg of furfural, and 0.1 kg of hydrochloric acid were added to a reaction vessel and stirred to react. After the reaction was completed, the mixture was filtered, washed four times with anhydrous ethanol, and dried under vacuum to obtain furfural-modified diatomaceous earth.

[0044] The reaction temperature was 60°C and the reaction time was 4 hours.

[0045] The vacuum drying temperature is 75°C and the time is 4 hours. Example 3

[0046] A sludge / biomass co-drying process, the operation steps of which are as follows: S1: 25kg of dewatered sludge, 13kg of biomass with a particle size of 10mm, 0.8kg of furfural-modified diatomaceous earth, 0.28kg of propyltriethoxysilane isocyanate (CAS: 24801-88-5), and 0.8kg of stannous octoate are fed into a twin-shaft differential mixer and mixed evenly. S2: The mixed material is discharged from the outlet of the twin-shaft differential speed mixer and sent to the corrosion-resistant mesh belt conveyor to spread the material evenly on the mesh belt to form a material layer; S3: Start the hot air drying system. The hot air furnace generates low-temperature hot air, which is distributed through the air duct and penetrates the material layer from bottom to top for drying. S4: The wet and hot exhaust gas generated during drying first enters the condensation and dehumidification device to remove moisture, then enters the heat recovery device to recover heat, and finally is discharged after purification treatment to meet the standards.

[0047] The biomass in question is wood chips.

[0048] The S1 dual-shaft differential mixer has two stirring shafts with speeds of 70 rpm and 90 rpm respectively, and they rotate in opposite directions. The mixing time is 10 minutes, and paddle-type stirring blades are installed on the stirring shafts.

[0049] The S2 mesh belt is made of stainless steel wire mesh and operates at a speed of 0.8 meters per minute.

[0050] The thickness of the material layer in S2 is 10 centimeters.

[0051] The S3 low-temperature hot air temperature is 110℃ and the wind speed is 4 m / s.

[0052] The S3 drying time is 100 minutes, and the material layer is turned over every 25 minutes during the drying process.

[0053] The preparation method of the furfural-modified diatomaceous earth is as follows: 8 kg of diatomaceous earth, 33 kg of anhydrous ethanol, 3 kg of furfural, and 0.2 kg of hydrochloric acid were added to a reaction vessel and stirred to react. After the reaction was completed, the mixture was filtered, washed four times with anhydrous ethanol, and dried under vacuum to obtain furfural-modified diatomaceous earth.

[0054] The reaction temperature was 70°C and the reaction time was 7 hours.

[0055] The vacuum drying temperature is 85℃ and the time is 5 hours. Example 4

[0056] A sludge / biomass co-drying process, the operation steps of which are as follows: S1: 30kg of dewatered sludge, 15kg of biomass with a particle size of 15mm, 1.0kg of furfural-modified diatomaceous earth, 1kg of propyltriethoxysilane isocyanate (CAS: 24801-88-5), and 1.0kg of stannous octoate are fed into a twin-shaft differential mixer and mixed evenly. S2: The mixed material is discharged from the outlet of the twin-shaft differential speed mixer and sent to the corrosion-resistant mesh belt conveyor to spread the material evenly on the mesh belt to form a material layer; S3: Start the hot air drying system. The hot air furnace generates low-temperature hot air, which is distributed through the air duct and penetrates the material layer from bottom to top for drying. S4: The wet and hot exhaust gas generated during drying first enters the condensation and dehumidification device to remove moisture, then enters the heat recovery device to recover heat, and finally is discharged after purification treatment to meet the standards.

[0057] The biomass in question is wood chips.

[0058] The S1 dual-shaft differential mixer has two stirring shafts with rotational speeds of 80 rpm and 100 rpm respectively, rotating in opposite directions, and a mixing time of 15 minutes. Paddle-type stirring blades are installed on the stirring shafts.

[0059] The S2 mesh belt is made of stainless steel wire mesh and operates at a speed of 1 meter per minute.

[0060] The thickness of the material layer in S2 is 15 cm.

[0061] The S3 low-temperature hot air temperature is 120℃ and the wind speed is 5 m / s.

[0062] The S3 drying time is 120 minutes, and the material layer is turned over every 30 minutes during the drying process.

[0063] The preparation method of the furfural-modified diatomaceous earth is as follows: 10 kg of diatomaceous earth, 35 kg of anhydrous ethanol, 4 kg of furfural, and 0.25 kg of hydrochloric acid were added to a reaction vessel and stirred to react. After the reaction was completed, the mixture was filtered, washed five times with anhydrous ethanol, and dried under vacuum to obtain furfural-modified diatomaceous earth.

[0064] The reaction temperature was 80°C and the reaction time was 8 hours.

[0065] The vacuum drying temperature is 90℃ and the time is 6 hours.

[0066] Comparative Example 1 A sludge / biomass co-drying process, the operation steps of which are as follows: S1: Feed 10kg of dewatered sludge, 5kg of biomass with a particle size of 5mm and 0.1kg of diatomaceous earth into a twin-shaft differential speed mixer and mix them evenly; S2: The mixed material is discharged from the outlet of the twin-shaft differential speed mixer and sent to the corrosion-resistant mesh belt conveyor to spread the material evenly on the mesh belt to form a material layer; S3: Start the hot air drying system. The hot air furnace generates low-temperature hot air, which is distributed through the air duct and penetrates the material layer from bottom to top for drying. S4: The wet and hot exhaust gas generated during drying first enters the condensation and dehumidification device to remove moisture, then enters the heat recovery device to recover heat, and finally is discharged after purification treatment to meet the standards.

[0067] The biomass mentioned is straw.

[0068] The S1 dual-shaft differential mixer has two stirring shafts with speeds of 50 rpm and 80 rpm respectively, rotating in opposite directions, and a mixing time of 5 minutes. The stirring shafts are equipped with paddle-type stirring blades.

[0069] The S2 mesh belt is made of stainless steel wire mesh and operates at a speed of 0.5 meters per minute.

[0070] The thickness of the material layer in S2 is 5 cm.

[0071] The S3 low-temperature hot air temperature is 80℃ and the wind speed is 2 m / s.

[0072] The S3 drying time is 60 minutes, and the material layer is turned over every 20 minutes during the drying process.

[0073] Comparative Example 2 A sludge / biomass co-drying process, the operation steps of which are as follows: S1: 10kg of dewatered sludge, 5kg of biomass with a particle size of 5mm, 0.1kg of diatomaceous earth, 0.2kg of propyltriethoxysilane isocyanate (CAS: 24801-88-5), and 0.1kg of stannous octoate are fed into a twin-shaft differential mixer and mixed evenly. S2: The mixed material is discharged from the outlet of the twin-shaft differential speed mixer and sent to the corrosion-resistant mesh belt conveyor to spread the material evenly on the mesh belt to form a material layer; S3: Start the hot air drying system. The hot air furnace generates low-temperature hot air, which is distributed through the air duct and penetrates the material layer from bottom to top for drying. S4: The wet and hot exhaust gas generated during drying first enters the condensation and dehumidification device to remove moisture, then enters the heat recovery device to recover heat, and finally is discharged after purification treatment to meet the standards.

[0074] The biomass mentioned is straw.

[0075] The S1 dual-shaft differential mixer has two stirring shafts with speeds of 50 rpm and 80 rpm respectively, rotating in opposite directions, and a mixing time of 5 minutes. The stirring shafts are equipped with paddle-type stirring blades.

[0076] The S2 mesh belt is made of stainless steel wire mesh and operates at a speed of 0.5 meters per minute.

[0077] The thickness of the material layer in S2 is 5 cm.

[0078] The S3 low-temperature hot air temperature is 80℃ and the wind speed is 2 m / s.

[0079] The S3 drying time is 60 minutes, and the material layer is turned over every 20 minutes during the drying process.

[0080] Comparative Example 3 A sludge / biomass co-drying process, the operation steps of which are as follows: S1: Feed 10kg of dewatered sludge, 5kg of biomass with a particle size of 5mm, 0.1kg of furfural-modified diatomaceous earth, and 0.1kg of stannous octoate into a twin-shaft differential mixer and mix them evenly. S2: The mixed material is discharged from the outlet of the twin-shaft differential speed mixer and sent to the corrosion-resistant mesh belt conveyor to spread the material evenly on the mesh belt to form a material layer; S3: Start the hot air drying system. The hot air furnace generates low-temperature hot air, which is distributed through the air duct and penetrates the material layer from bottom to top for drying. S4: The wet and hot exhaust gas generated during drying first enters the condensation and dehumidification device to remove moisture, then enters the heat recovery device to recover heat, and finally is discharged after purification treatment to meet the standards.

[0081] The biomass mentioned is straw.

[0082] The S1 dual-shaft differential mixer has two stirring shafts with speeds of 50 rpm and 80 rpm respectively, rotating in opposite directions, and a mixing time of 5 minutes. The stirring shafts are equipped with paddle-type stirring blades.

[0083] The S2 mesh belt is made of stainless steel wire mesh and operates at a speed of 0.5 meters per minute.

[0084] The thickness of the material layer in S2 is 5 cm.

[0085] The S3 low-temperature hot air temperature is 80℃ and the wind speed is 2 m / s.

[0086] The S3 drying time is 60 minutes, and the material layer is turned over every 20 minutes during the drying process.

[0087] The preparation method of the furfural-modified diatomaceous earth is as follows: 5 kg of diatomaceous earth, 25 kg of anhydrous ethanol, 1 kg of furfural, and 0.08 kg of hydrochloric acid were added to a reaction vessel and stirred to react. After the reaction was completed, the mixture was filtered, washed three times with anhydrous ethanol, and dried under vacuum to obtain furfural-modified diatomaceous earth.

[0088] The reaction temperature was 50°C and the reaction time was 3 hours.

[0089] The vacuum drying temperature is 70℃ and the time is 3 hours.

[0090] Table 1: Test Results of Examples and Comparative Examples Moisture content (%) Looseness Example 1 19.8 excellent Example 2 19.5 excellent Example 3 19.0 excellent Example 4 18.7 excellent Comparative Example 1 34.1 Difference Comparative Example 2 25.3 good Comparative Example 3 24.6 good As can be seen from the comparison of the test results of the embodiments and the comparative examples in Table 1, the materials processed by the process of the present invention have significant advantages in key indicators: the moisture content control of the materials in the embodiments is better, and the looseness reaches the "excellent" level; while the materials in the comparative examples have problems with high moisture content or looseness only "good" or "poor". This indicates that the sludge / biomass mixed drying process of the present invention can effectively solve the problems of difficult moisture content control, easy agglomeration, and uneven drying in traditional processes, and its overall drying performance is significantly better than the comparative scheme.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A sludge / biomass co-drying process, the operation steps of which are as follows: S1: According to the mass fractions, 10-30 parts of dewatered sludge, 5-15 parts of biomass with a particle size of 5-15mm, 0.1-1.0 parts of furfural-modified diatomaceous earth, 0.2-1 parts of propyltriethoxysilane isocyanate, and 0.1-1.0 parts of stannous octoate are fed into a twin-shaft differential mixer and mixed evenly. S2: The mixed material is discharged from the outlet of the twin-shaft differential speed mixer and sent to the corrosion-resistant mesh belt conveyor to spread the material evenly on the mesh belt to form a material layer; S3: Start the hot air drying system. The hot air furnace generates low-temperature hot air, which is distributed through the air duct and penetrates the material layer from bottom to top for drying. S4: The wet and hot exhaust gas generated during drying first enters the condensation and dehumidification device to remove moisture, then enters the heat recovery device to recover heat, and finally is discharged after purification treatment to meet the standards. The furfural-modified diatomaceous earth is prepared by reacting diatomaceous earth, anhydrous ethanol, furfural, and hydrochloric acid.

2. The sludge / biomass co-drying process according to claim 1, characterized in that: The biomass mentioned is straw or wood chips.

3. The sludge / biomass co-drying process according to claim 1, characterized in that: The S1 dual-shaft differential mixer has two stirring shafts with rotational speeds of 50-80 rpm and 80-100 rpm respectively, rotating in opposite directions, and a mixing time of 5-15 minutes. Paddle-type stirring blades are installed on the stirring shafts.

4. The sludge / biomass co-drying process according to claim 1, characterized in that: The S2 mesh belt is made of stainless steel wire mesh and operates at a speed of 0.5-1 meter / minute.

5. The sludge / biomass co-drying process according to claim 1, characterized in that: The thickness of the S2 material layer is 5-15 cm.

6. The sludge / biomass co-drying process according to claim 1, characterized in that: The S3 low-temperature hot air temperature is 80-120℃, and the wind speed is 2-5 m / s.

7. The sludge / biomass co-drying process according to claim 1, characterized in that: The S3 drying time is 60-120 minutes, and the material layer is turned over every 20-30 minutes during the drying process.

8. The sludge / biomass co-drying process according to claim 1, characterized in that: The preparation method of the furfural-modified diatomaceous earth is as follows: According to the mass fractions, add 5-10 parts of diatomaceous earth, 25-35 parts of anhydrous ethanol, 1-4 parts of furfural, and 0.08-0.25 parts of hydrochloric acid to a reaction vessel and stir to react; after the reaction is completed, filter, wash 3-5 times with anhydrous ethanol, and vacuum dry to obtain furfural-modified diatomaceous earth.

9. The sludge / biomass co-drying process according to claim 8, characterized in that: The reaction temperature is 50-80℃ and the reaction time is 3-8 hours.

10. The sludge / biomass co-drying process according to claim 8, characterized in that: The vacuum drying temperature is 70-90℃, and the time is 3-6 hours.

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