What is the operating cost of removing one ton of water by domestic sludge dryer?

Technical characteristics of domestic sludge dryer;

1. Sludge can be fully treated as "reduced, stabilized, harmless and recycled", and finally sludge particles can be used as fertilizer, fuel, incineration, building materials, biofuel, landfill cover, land use and so on.

2. Continuous mesh belt drying mode is adopted, which is suitable for various sludge drying systems (including sludge with large sand content) and has long service life.

3. The mud cake with water content of 80% can be dried into sludge particles with water content of 65438 00%; Sludge reduction is 1/4- 1/5, and the calorific value of municipal sludge after drying can reach 3000kcal/kg.

4. Patented technologies of sludge extrusion molding and crushing molding, different paving methods are adopted according to different solid contents of sludge.

5. Low temperature (40-75℃) totally enclosed drying process, no tail gas emission, no odor treatment system; Low-temperature drying can fully avoid the volatilization of different types of organic substances and malodorous gases in sludge (the volatilization temperature of alkanes and aromatic hydrocarbons is 100-300℃, that of cycloalkanes is mainly 250-300℃, that of nitrogen compounds, amines and oximes is mainly 200-300℃, and that of alcohols, ethers, aliphatic ketones and amide nitriles is mainly 200℃. Advanced layered air distribution and mixed air dustproof technology are efficient and stable. In addition, the volatilization temperatures of aldehydes and anilines are mainly at 150℃, and the volatilization temperatures of lipids are at 150-250℃.

6. The whole drying process can be carried out in a closed environment, and no gas will be discharged into the external environment, which will not cause secondary environmental pollution; No pollutants are discharged during the drying process, and the sanitary conditions of the drying workshop are good; Centralized water cooling mode is selected, which has good cooling effect and excellent working temperature in the workshop.

7. The system runs safely, without potential safety hazards and nitrogen flushing; Oxygen content in sludge drying process

8. The conveying speed of mesh belt is controlled by frequency conversion, and the water content of sludge discharge can be adjusted (10-30%) to meet various technological requirements.

9. Adopt the leading heat pump dehumidification technology, save energy by more than 40%, and consume about 0.3 ~ 10 kWh every 20 hours; The traditional sludge drying equipment 1 20 needs energy, besides electricity, cooling water and chemicals. Using off-peak electricity consumption mode can save energy by more than 60%.

10, with small floor space and convenient installation; Each equipment for evaporating 1000kg water covers an area of about 3.5m2

1 1, the daily treatment capacity of a single drying line can reach 45 tons (mud cake with water content of 80%), and the daily treatment capacity of mud cake with water content of 55% can reach 140 tons, which is suitable for sludge dispersion or centralized treatment mode. Sludge cake treatment can reduce the volume and quantity and save the transportation cost of sludge (according to different routes, the transportation cost per ton of sludge is about 65438+)

12, PLC+ touch screen control system, fully automatic operation, convenient operation and management; Wet and dry bulb temperature and humidity control, feeding frequency control, molding control, discharging solid content control, material laying control, manual control, etc.

Sludge is a solid deposit produced in the process of water and sewage treatment. Because there are many kinds of sludge, its treatment and disposal processes are also different, so classification is very necessary. According to its source, it can be roughly divided into municipal sludge, pipe network sludge, river and lake sludge, industrial sludge and other categories. The volatilization temperature of different types of organic matter in sludge is obviously different. In the process of wastewater purification, pollutants in wastewater are removed by biochemical degradation. Biological treatment can degrade most organic pollutants into water and gas (aerobic treatment produces oxygen and carbon dioxide, anaerobic treatment produces CH4-based gas), while metal pollution (including heavy metals) cannot be treated but is concentrated in sludge. Sludge produced by sewage treatment has high water content. Because of the combination of water and sludge particles, mechanical removal is limited. The organic matter content and ash ratio in sludge, especially the addition of coagulant, have important influence on the maximum solid content. Generally speaking, the solid content of 20%-50% can be obtained by mechanical dehydration, and the formed sludge is called mud cake. The water content of mud cake is still high, and the difficulty and cost of disposal are still high, which needs to be further reduced. At this time, in addition to natural air drying, large-scale reduction can only be realized by evaporation of input heat, and the treatment of drying with heat is thermal drying. The domestic sludge dryer discussed in this paper is a thermal drying technology.

Air-energy heat pump is a device that uses refrigeration system to cool and dehumidify hot and humid air, and at the same time recovers the latent heat of air moisture condensation by heat pump principle to heat air. Dehumidification heat pump = dehumidification (dehumidification and drying)+heat pump (energy recovery). The high cost of sludge drying is the main bottleneck restricting the large-scale application of drying technology. Domestic sludge dryer adopts dehumidification heat pump to dehumidify and dry sludge through hot air circulation condensation. 90% of the heat provided by the traditional sludge thermal drying system is converted into waste heat loss (latent heat of steam and sensible heat of hot air); Dehumidification and drying is to recover the latent heat of water vapor and the sensible heat of air in the exhaust air, and there is no waste heat emission during dehumidification and drying;

Heat pump heating COP, the calorific value COP is generally between 3-5, that is, the traditional 4kw drying heating power, and only 1kw electric power needs to be input in heat pump drying. Heat source = condensation heat released by phase change of water vapor in air -2424KJ/kg, 30℃, atmospheric pressure; 2355 kj/kg at 60℃ and 2258KJ/kg at 100℃ (calorific value of coal 18000KJ/kg).

Sludge has high moisture content, huge volume, high organic matter content, perishable and smelly, embryonic body structure, difficult dehydration, high dehydration cost, and excessive heavy metals and bacteria content. It is easy to produce secondary pollution, and the output continues to increase, rising sharply at the rate of 10- 15% every year. Moreover, our sludge dryer has many advantages: small floor space, no need to build an external platform, saving capital expenditure; Adopt fully intelligent automatic control system, with low running cost, centralized monitoring, no need for special post setting, just patrol once a day; The maintenance cost is low, which is only equivalent to maintaining an air conditioner; The operation is flexible, and the different requirements of sludge drying (30% ~ 90%) can be met by adjusting PLC parameters; The evaporation temperature is low, and distilled water is equivalent to ordinary water; Because the temperature of the heated dry air is only 40℃, explosion is avoided and odor generation is suppressed. When the water content is reduced to 30%-40%, the sludge looks loose and granular, with better bearing capacity, less odor and good hydrophobicity, which can be effectively incinerated and landfilled, and is more convenient to handle.

Structure of domestic sludge dryer;

Sludge dehumidification and drying = hot air circulation+condensation dehumidification and drying (dehumidification heat pump). There are two core processes. Firstly, sludge moisture absorbs heat (hot air) and vaporizes = wet air+dry matter (vaporizes); Second: ★ Wet air passes through dehumidification heat pump = condensed water+dry hot air (condensation)

1) adopts heat pump heat recovery technology, and there is no residual heat emission in closed drying mode; 2) Low temperature drying process below 80℃; 3) electrostatic expansion without mechanical electrostatic friction with the contact surface; 4) There is no "sticky phase" stage (about 60%) in the drying process of municipal sludge; 5) The dry material is granular, and there is no dust hazard; 6) The discharging temperature is low (< 50℃), so it can be directly stored without cooling;

Innovative technology of air energy heat pump sludge dryer;

1) Three-effect dehumidification regeneration technology can be adopted, with lower outlet humidity and high drying efficiency; At the same time, the three-effect technology can save a lot of fan energy consumption.

2) The layered air distribution system is adopted to meet the requirements of rapid dehydration of wet mud, and the low-temperature drying cycle is short; 1, sent to cement plant, mixed with clinker to produce cement; 2, directly mixed with raw coal for combustion and utilization, which reduces the coal consumption of the boiler and improves the economic benefit; 3, instead of clay and pulverized coal, it is sent to a brick factory to produce light bricks; 4. Used as slow-release fertilizer to increase crop yield; 5, used as chemical raw materials for production; 6. Used as soil improver to improve soil erosion resistance and water retention.

3) Modular structure design, strong load adjustment ability, simple installation and convenient disassembly.

4) Both conveying and feeding motors adopt variable frequency stepless speed regulation, which is suitable for dry material adjustment with different moisture content (10%-50%) and has stronger adaptability.

Scope of application of domestic sludge dryer:

It can also be used to dry electroplating sludge, leather sludge, paper sludge, alumina sludge, municipal domestic sludge, tannery sludge, chemical sludge, steam sludge, printing and dyeing sludge, etc. , suitable for electroplating, hardware products, paper mills, electrolytic aluminum, alumina, soy sauce residue, sewage treatment, wastewater treatment, printing and dyeing plants, printing plants, fruit residues, biological agents, biotechnology, chemical fertilizers, pharmaceutical factories, etc.