System for preparing high-protein liquid fertilizer through continuous sludge alkali-thermal hydrolysis
By using a continuous sludge alkaline hot water hydrolysis system, which combines serpentine pipes and flash evaporation devices, the problems of long hot water hydrolysis time and low production capacity in existing technologies have been solved, enabling rapid treatment and efficient resource utilization of sludge.
Patent Information
- Application Number
- CN202423222978.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing alkaline hydrolysis processes for sludge treatment are mainly batch-based. The hydrolysis time is long and the heating method is inefficient, making it difficult to increase production capacity. Insufficient mixing leads to incomplete hydrolysis, which affects the efficiency of sludge resource utilization.
A continuous sludge alkaline hot water hydrolysis system is adopted, which directly mixes and heats the sludge through a serpentine pipeline, combined with a two-stage flash evaporation device and an insulation layer, to achieve continuous sludge treatment, shorten the hot water hydrolysis time, and recover heat through the serpentine pipeline and flash evaporation device, thereby improving the mixing efficiency of sludge and reagents.
It enables rapid and continuous sludge treatment, reduces the difficulty of dewatering hydrolysate, increases production capacity, reduces steam consumption and heat loss, and improves the efficiency of sludge resource utilization.
Smart Images
Figure CN223813433U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to sludge resource utilization technical field, concretely is a kind of continuous sludge alkali thermal hydrolysis preparation high protein liquid fertilizer system. BACKGROUND
[0002] Sludge is the byproduct of wastewater treatment, with an annual output of up to 600 million tons (based on 80% moisture content). It contains many toxic substances, including potentially toxic elements, persistent organic pollutants and pathogens, etc. At present, the main treatment method of sludge is landfill and incineration. Alkaline thermal hydrolysis promotes the release of intracellular proteins, fats and other organic matter from sludge through the dual action of temperature and alkali, and changes the internal structure of sludge, providing a basis for the next step of dewatering and dewatering filtrate fertilizer utilization.
[0003] However, the current sludge alkali thermal hydrolysis treatment process is mainly in batches (one batch is reacted and then the next batch is carried out), and the thermal hydrolysis is mainly carried out in a tank reactor, and the heating method is mainly indirect heating by jacket (hot source is introduced into the pipe wall). Not only is the heating slow and the thermal hydrolysis time long, but also the production capacity is difficult to effectively improve, and insufficient stirring can lead to incomplete hydrolysis, thereby increasing the difficulty of subsequent hydrolysis liquid dewatering and affecting the quality of sludge press filtrate, which is not conducive to the sale of end sludge resource products and the sustainable development of the project. SUMMARY
[0004] To solve the above technical problems, the utility model provides a kind of continuous sludge alkali thermal hydrolysis preparation high protein liquid fertilizer system, it can realize sludge continuous treatment, shorten thermal hydrolysis time, reduce hydrolysis liquid dewatering difficulty, improve production capacity.
[0005] The technical scheme is as follows: a kind of continuous sludge alkali thermal hydrolysis preparation high protein liquid fertilizer system, it is characterized in that, it includes working preheating mud tank, continuous thermal hydrolysis unit, two-stage flash device, solid-liquid separation device, dry slag collection device connected in sequence by pipeline, the working preheating mud tank is connected water tank and sludge storage warehouse, the continuous thermal hydrolysis unit is connected reagent mixing tank and saturated steam pipeline, the two-stage flash device is connected working preheating mud tank by flash steam pipeline, the continuous thermal hydrolysis unit includes shell and the serpentine pipe being arranged in the shell, the serpentine pipe's import is connected the reagent feeding pipe of the reagent mixing tank and the saturated steam pipeline, and the serpentine pipe's export is connected the two-stage flash device.
[0006] Further characterized in that, the liquid outlet pipeline of the solid-liquid separation device is connected in sequence filtrate storage tank, MVR evaporation concentration device and liquid fertilizer production device;
[0007] The continuous thermal hydrolysis unit is arranged horizontally;
[0008] The solid-liquid separation device is a plate-and-frame filter press device or a belt filter press device.
[0009] The outer surfaces of the working preheating mud tank, the continuous thermal hydrolysis unit, the two-stage flash evaporation device and the MVR evaporation and concentration device are provided with thermal insulation layers.
[0010] The working preheating mud tank and the medicament mixing tank are both provided with stirring devices.
[0011] After the utility model is adopted, through direct mixing and contact of sludge, hydrolysis medicament and steam, the continuous thermal hydrolysis mode using the serpentine pipeline for heat preservation, the two-stage flash evaporation device is arranged to recover heat, and finally, sludge continuous treatment is realized, the thermal hydrolysis time is shortened, the hydrolysis liquid dehydration difficulty is reduced, and the production capacity is improved. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 It is the system principle diagram of the utility model;
[0013] Figure 2 It is the structure schematic diagram of the continuous thermal hydrolysis unit. CONCRETE EMBODIMENT
[0014] See Figure 1 , Figure 2 As shown in the figure, a continuous sludge alkaline thermal hydrolysis system for preparing high-protein liquid fertilizer includes a working preheating mud tank 1, a continuous thermal hydrolysis unit 2, a two-stage flash evaporation device 3, a solid-liquid separation device 4 and a dry residue collection device 5 connected in sequence through pipelines, the working preheating mud tank 1 is connected with a water tank 6 and a sludge storage bin 7, the continuous thermal hydrolysis unit 2 is connected with a medicament mixing tank 8 and a saturated steam pipeline 9, the two-stage flash evaporation device 3 is connected with the working preheating mud tank 1 through a flash steam pipeline 10, and the heat released by flash evaporation can be recovered to preheat sludge, the continuous thermal hydrolysis unit 2 is horizontally arranged and includes an outer shell 2-1 and a serpentine pipe 2-2 arranged in the outer shell 2-1, the inlet of the serpentine pipe 2-2 is connected with a medicament feeding pipe of the medicament mixing tank 8 and the saturated steam pipeline 9, and the outlet of the serpentine pipe 2-2 is connected with the two-stage flash evaporation device 3, after saturated steam, preheated sludge from the working preheating mud tank 1 and mixed alkaline medicament are mixed and then enter the continuous thermal hydrolysis unit 2 and the serpentine pipe 2-2, so that the materials are fully mixed and rapidly heated.
[0015] The hydrolysis medicament in the medicament mixing tank 8 is lime milk generated after lime is mixed with water.
[0016] The solid-liquid separation device 4 is a plate-and-frame filter press device or a belt filter press device, and a liquid outlet pipeline of the solid-liquid separation device 4 is sequentially connected with a filtrate storage tank 11, an MVR evaporation and concentration device 12 and a liquid fertilizer production device 13.
[0017] The outer surfaces of the working preheating sludge tank 1, the continuous thermal hydrolysis unit 2, the two-stage flash evaporation device 3 and the MVR evaporation and concentration device 12 are provided with heat preservation layers, so that the working temperature can be maintained and the heat loss can be reduced.
[0018] The working preheating sludge tank 1 and the medicament mixing tank 8 are provided with stirring devices, and the frequency conversion control is adopted.
[0019] The application can shorten the heating and reaction time of sludge alkaline thermal hydrolysis to 90 minutes, so as to improve the production capacity, facilitate the mixing of sludge and hydrolysis medicament and the uniform heating of sludge in the thermal hydrolysis reaction, improve the effect of sludge alkaline thermal hydrolysis, and make the organic matter and protein content of the filter press liquid after solid-liquid separation reach 2.3% and 2.2% respectively; compared with the batch steam jacket heating, the heat loss can be greatly reduced, the two-stage flash evaporation device can not only reduce the temperature of the sludge hydrolysis liquid, but also preheat the sludge through the flash steam reflux, so as to reduce the steam consumption; compared with the steam jacket type reaction kettle heating reaction mode, the steam use can be reduced by 20%; the dewatering performance of the sludge hydrolysis liquid is enhanced, the moisture content of the sludge cake formed after the plate and frame filter pressing can be reduced to 40%, the mass of the sludge dry residue can be effectively reduced, and the subsequent disposal cost can be reduced.
Claims
1. A system for preparing high-protein liquid fertilizer by continuous sludge alkali thermal hydrolysis, characterized in that, It comprises a working preheating mud tank, a continuous thermal hydrolysis unit, a two-stage flash device, a solid-liquid separation device and a dry residue collection device connected in sequence through pipelines, the working preheating mud tank is connected with a water tank and a sludge storage bin, the continuous thermal hydrolysis unit is connected with a medicament mixing tank and a saturated steam pipeline, the two-stage flash device is connected with the working preheating mud tank through a flash steam pipeline, the continuous thermal hydrolysis unit comprises a shell and a serpentine pipe arranged in the shell, the inlet of the serpentine pipe is connected with a medicament feeding pipe of the medicament mixing tank and the saturated steam pipeline, and the outlet of the serpentine pipe is connected with the two-stage flash device.
2. The system for preparing high-protein liquid fertilizer through continuous sludge alkali thermal hydrolysis according to claim 1, characterized in that, The liquid outlet pipeline of the solid-liquid separation device is connected with a filtrate storage tank, an MVR evaporation and concentration device and a liquid fertilizer production device in sequence.
3. The system for preparing high-protein liquid fertilizer through continuous sludge alkali thermal hydrolysis according to claim 1, characterized in that, The continuous thermal hydrolysis unit is horizontally arranged.
4. The system for preparing high-protein liquid fertilizer through continuous sludge alkali thermal hydrolysis according to claim 1, characterized in that, The solid-liquid separation device is a plate-and-frame filter press device or a belt filter press device.
5. The system for preparing high-protein liquid fertilizer through continuous sludge alkali thermal hydrolysis according to claim 2, characterized in that, The outer surfaces of the working preheating mud tank, the continuous thermal hydrolysis unit, the two-stage flash device and the MVR evaporation and concentration device are all provided with thermal insulation layers.
6. The system for preparing high-protein liquid fertilizer through continuous sludge alkali thermal hydrolysis according to claim 1, characterized in that, Stirring devices are arranged in the working preheating mud tank and the medicament mixing tank.