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Energy saving and environmental protection sludge drying equipment micro negative pressure low temperature mesh belt dryer

Detailed description:

The company is a sludge processing and drying equipment company specializing in sludge processing and drying.

Product introduction / Products

Harmless sludge reduction is an important part of sludge disposal, which directly affects the effect and cost of sludge resource disposal. At present, there are two main methods of sludge reduction, namely mechanical dewatering and thermal drying. Among them, mechanical dehydration generally includes pressure, plate pressure, screw filter press, screw filter press and other traditional equipment, thermal drying is divided into medium high temperature direct drainage drying and low temperature dehumidification drying.

The medium and high temperature direct discharge drying equipment includes high-temperature rotary drum drying, disc drying, blade drying and other traditional equipment. Their common feature is that the investment in fixed facilities is relatively low, but it needs to be equipped with heat sources (such as natural gas, high-pressure steam, etc.), natural gas supply facilities, hot blast furnaces, burners, steam boilers, water treatment systems, waste gas (odor) treatment equipment The comprehensive operation cost is higher than that of low temperature drying More than 40%.

     The common point of mechanical dehydration and medium temperature drying is that the equipment investment is relatively low, and the difference is that the dehydration capacity is low( 60-80%)。 At the same time, as the water filtered out is still sewage, sewage treatment and odor treatment facilities must be provided, so the comprehensive cost is very high (dehydration equipment, site, supporting infrastructure, sewage treatment equipment, odor treatment equipment, electricity, medicament, etc.).

     There are two kinds of heat pump low-temperature dehumidification and drying equipment: sealed low-temperature dehumidification drying equipment and micro negative pressure low-temperature dehumidification and drying equipment. Sealed low-temperature dehumidification and drying has the characteristics of low operating cost, small floor area, simple operation process and high degree of automation. Therefore, it has been popular in the market for several years, but also exposed three major problems: operation process Serious odor leakage Uneven wet and dry "Sandwich" needs to be back mixed and re dried High failure rate (serious corrosion and damage of refrigeration components), so the amount of shutdown maintenance is large.

     The micro negative pressure heat pump low temperature dehumidification dryer is integrated on the basis of the advantages of the sealed low-temperature dehumidifier Micro negative pressure, waste gas incineration heat energy recycling, three pass continuous thinning drying Three technologies (including two patented technologies) can better solve the three major problems of odor leakage, uneven drying and wetting, and high failure rate, making the low-temperature dehumidification and drying technology increasingly perfect. Its environmental protection, stability and cost performance advantages are more obvious than those of various dehydration equipment Micro negative pressure low temperature sludge drying equipment It has become a high-quality environmental protection equipment in sludge drying equipment.

General situation of low temperature net belt sludge drying equipment with micro negative pressure

1.  Sludge type: Municipal Sewage Sludge

2.  Mechanical dehydration mode: plate and frame type, screw extrusion type, etc.

3.  Sludge water content requirements: initial moisture content: 80%   Moisture content after drying: 10%

4.  Drying mode : Net belt continuous closed low temperature dehumidification drying, waste gas incineration treatment, waste heat recycling.

5.  Drying temperature: 65~80℃。


Low temperature net belt with micro negative pressure Design features of sludge drying equipment

Serial number

project

Design features

  1

drying temperature

The drying temperature is lower than 85 ℃ to avoid safety accidents caused by high calorific value;

  2

Desiccation Room

In order to prevent dust explosion during sludge drying process, mesh belt static drying is adopted, and there is no dust in the drying process;

  3

Deodorant design

In order to prevent odor leakage, two methods are adopted

1) Closed condensation is used to remove water, circulating soft water is used as cold source, and the temperature of soft water is 10-33 ℃;

2) The drying chamber is treated with micro negative pressure, and the excess waste gas is incinerated in the waste gas incinerator. The heat generated is sent back to the drying chamber through the heat exchanger for sludge drying.

  4

Design condition

Heat source: air dehumidification heat pump;

Cold source: inlet water 25 ℃, return water 35 ℃; (cooling water)

Upper return air condition: dry bulb temperature 56 ℃, relative humidity 65%, dew point temperature 48.6 ℃;

The lower air supply condition: dry bulb temperature 75 ℃, relative humidity 22.6%;


    

Low temperature net belt with micro negative pressure Working principle of sludge drying

  Picture 1.jpg

1. Working principle:

It uses the dehumidification heat pump to condense and dry the sludge with hot air circulation, and recovers the latent heat of water vapor and sensible heat of air in the exhaust air, and there is no waste heat emission in the process of dehumidification and drying;

Dehumidification heat pump -It is a kind of device that uses refrigeration system to cool and dehumidify hot and humid air, at the same time, recovers air moisture through heat pump principle, condenses latent heat and heats air.

Dehumidification heat pump =Dehumidification (dehumidification) combined with heat pump (dehumidification) + drying

Moisture absorption of sludge ( Hot air ) vaporization = Moist air + Dry materials ( vaporization )

The wet air passes through the dehumidification heat pump = Condensate water + Dry hot air ( condensation )

 

2、 The value and significance of this working principle are as follows

① Increase heat utilization

heat source =Condensation heat released by water vapor phase change in air

Atmospheric air -2424kj / kg at 30 ℃, 2355kj / kg at 60 ℃, 2258kj / kg at 100 ℃ (coal calorific value 18000kj / kg)

Improve drying efficiency

Heat pump heating Cop, calorific value cop is generally between 3-5, that is, the traditional drying heating power is 4kw in heat pump drying Just To enter 1kw Electrical power.

Low temperature net belt with micro negative pressure Overview of sludge drying equipment

 

Serial number

project

content

one

Types of sludge

Municipal Sewage Sludge

two

Mechanical dehydration mode

Plate and frame type, screw extrusion type, etc

three

Water content requirement of sludge

Initial moisture content: 80%, moisture content after drying: 10%

four

Drying mode

Net belt continuous closed low temperature dehumidification drying, waste gas incineration treatment, waste heat recycling

five

drying temperature

65~80℃

six

Sludge treatment capacity

About 20 tons / day (from 80% → 10%)

seven

Comprehensive power consumption

150KW. H / T (wet material)

 

 

Comparison of dryer performance

Low temperature mesh belt dryer with micro negative pressure Comparison with medium temperature drying

entry name

Medium temperature zone drying

Low temperature mesh belt dryer with micro negative pressure

Sludge spreading

Stainless steel mesh or stainless steel chain plate

Plastic or stainless steel

drying temperature

110-150℃

48-60 ℃ (return air) / 68-85 ℃ (supply air)

Dehumidification method

Open (dehumidification + condensation)

Closed (condensing)

Heating mode

Steam, hot air

Air energy heat pump (electricity) + waste heat of incinerator flue gas (heat exchange), etc

heat source

Coal, oil and gas (anaerobic digested gas)

Steam condensation heat + flue gas waste heat

Feed molding

Extrusion, cutting and granulation

Strip extrusion and granulation

Waste gas treatment system

Complex deodorization system is needed

Waste heat treatment technology of flue gas from closed incinerator

Dry material cooling

The material temperature is high and needs to be cooled and stored

The material temperature is low and can be stored directly without cooling

energy consumption

high

low

System matching

More matching and complicated installation

Less matching, simple installation and short installation cycle

Typical manufacturers

Andriz, Austria, Huber Klein, sevar, Dornier, stela, Siemens, Germany, Euroby, Euroby, Veolia Kruger, Denmark

China shinci, watropur, Switzerland

 

 

Treatment method contrast:

 

Project name

Thermohydrolysis + anaerobic digestion + plate and frame filter press

Heat drying

Low temperature carbonization

Plate and frame pressure filtration + lime + heat drying

Low temperature net belt drying with micro negative pressure √

Water content in dry mud

60%

20-40%

20%

40%

10%

Sludge disposal mode

Landfill and composting

Incineration + mixed burning

burn

cement kiln

Co firing + gasification

energy

Oxygen + electricity

Fuel, gas + coal

Fuel, gas + coal

Electricity + medicament + lime

Electricity or other energy sources and heat sources are flexible

area covered

large

Small

Small

large

Small

Operability

Responsible, need professional team

General, poor security

commonly

Responsible, increase dry mud volume

Safe, simple and intelligent

Environmental performance

commonly

Deodorization system required

Deodorization system required

Deodorization system required

No deodorization is required

Applicability

High organic content

apply

High organic content

apply

Wide applicability (domestic sludge, printing and dyeing, papermaking, chemical industry, leather and other types of sludge drying system)

energy consumption

commonly

higher

commonly

higher

low

Selection suggestions

★★

★★★

★★★

★★

★★★★★

 

  The micro negative pressure low-temperature mesh belt dryer has the advantages of simple matching, low civil engineering cost, excellent working environment and automatic operation, which is more suitable for resource utilization.

1.  Wide range of application

l It is suitable for various sludge drying systems such as domestic sludge, printing and dyeing, papermaking, chemical industry, leather, etc;

l Finally, sludge particles can be used as fuel, incineration, building materials, biofuels, etc. to realize the reuse of waste;

l It is an important part of sludge reduction, stabilization, harmless and resource treatment;

 

2.  energy conservation

l Using air energy and waste gas incineration waste heat, using low-temperature waste heat drying method, can greatly reduce the energy demand in the drying process, and other waste heat can be used as heat source to realize the full utilization of heat source;


 

3.  security

l In the process of low temperature drying, the drying chamber is in the state of micro negative pressure, so the drying process is safe and there is no hidden danger such as explosion.

l Oxygen content in sludge drying process <12%; dust concentration <60g/m3; Particle temperature <70 ℃;

l There is no mechanical static friction between the sludge and the contact surface;

l The dry material is granular and has no dust hazard;

l Low discharge temperature ( fifty ) It can be stored directly without cooling;

 

4.  environmental protection

l Low temperature negative pressure fully closed drying mode is adopted, no odor overflowing and complex deodorization device is needed;

l Low temperature drying process is adopted, H2S NH3 The amount of precipitation is greatly reduced;

l Condensate water ( Sludge moisture ) The treatment is simple (or direct discharge), saving the cost of condensate treatment in drying process;

 

5.  High efficiency

l Can be directly 80% Sludge with moisture content is dried to 10%, There is no need to dispose in sections;

l The drying process has no loss of organic matter and high calorific value, which is suitable for later resource utilization;

l Capacity reduction up to 67% , weight reduction up to 80% It can save a lot of transportation cost;

l Can be suitable for 83%-50% Moisture content sludge drying;  

 

6.  intelligence

l Fully automatic operation, saving a lot of labor costs;

l PLC+ Touch screen intelligent control can realize remote centralized control;

l The moisture content of discharge can be adjusted arbitrarily;

 

7.  save

l Small floor area, no complex civil structure and infrastructure, saving civil construction cost;

l The installation of the equipment is simple and the period of installation and debugging is short;

 

8.  durable

l Corrosion resistant materials such as stainless steel, heat exchanger with electroplating anti-corrosion treatment, long service life;

l No mechanical wear during operation, long service life

l No vulnerable and consumable parts, easy to use and manage;

 

9.  Strong applicability

l The daily treatment capacity of a single drying line can reach 20 tons (80% moisture content sludge cake), suitable for sludge dispersion or centralized treatment mode;

10.  Innovative technology

l Low temperature design, suitable for a wider range and more energy saving;

l The regenerative cycle design is adopted to save the heat loss in the cooling and heating process;

l The heat recovery design of incineration waste gas is adopted to further reduce energy consumption;

l The independent layered air distribution system can meet the requirements of rapid dehydration of wet mud, and the low-temperature drying cycle is short;

l Modular structure design, strong load regulation ability, simple installation and convenient installation;

l Variable frequency stepless speed regulation is adopted for conveying and feeding motors, which are suitable for different moisture content Dry material adjustment, strong adaptability.




 Sludge dryer 20197 29 -3.jpg


 Sludge treatment equipment 600400 2019-7-27-2.jpg

 

Sichuan Jieneng drying equipment Co., Ltd. is a scientific and technological enterprise focusing on agricultural products, harmless drying scheme design and equipment development of urban sludge, located in Chengdu high tech Zone.

The company upholds "While pursuing the material and spiritual happiness of employees, we should make contributions to improving the value of agricultural products and protecting the environment", and adhere to the concept of "emphasizing market, strengthening research and development, and intensive production" With more than 40 years of experience in developing drying equipment, the company has developed a series of drying equipment for clean energy with solar energy, air energy, natural gas, steam, biofuel, electric energy and microwave as heat sources. The company has 23 patents and 5 patents related to sludge harmless treatment technology.


Tel: 18080555651 028-27926369


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