Air drying system in compressor system Drying equipment

Air drying system in compressor system Drying equipment

Drying equipment is also called dryers and dryers. A device used for drying operations in which the wet component (generally water or other volatile liquid components) of a material is vaporized and escapes by heating to obtain a solid material with a specified moisture content. The purpose of drying is for material use or further processing needs. If wood is IN the drying before making wood model, wood can prevent product deformation, ceramic billet before calcination can prevent finished product cracking. In addition, the dried material is also easy to transport and storage, such as drying the harvested grain to a certain wet content below, to prevent mildew. Because natural drying is far from meeting the needs of production development, various mechanized dryers are more and more widely used.

air drying system in compressor system How it works:

The drying process needs to consume a lot of heat energy. In order to save energy, some materials with high wet content, suspensions or solutions containing solid substances are generally first dehydrated by machinery or heated to evaporate, and then dried in the dryer to get dry solids.

In the drying process, it is necessary to complete the transfer of heat and mass (wet fraction) at the same time, to ensure that the wet fraction steam partial pressure (concentration) on the material surface is higher than the wet fraction steam partial pressure in the external space, and to ensure that the heat source temperature is higher than the material temperature.

Heat is transferred from high temperature heat source to wet material in various ways, so that the material surface wet vaporization and escape to the external space, so that the difference in wet content between the material surface and the interior. The internal wet component diffuses to the surface and vaporizes, so that the wet content of the material is constantly reduced and the overall drying of the material is gradually completed.

The drying rate of the material depends on the surface vaporization rate and the diffusion rate of the internal wet fraction. Generally, the drying rate in the early drying stage is controlled by the surface vaporization rate. Then, as long as the external conditions of drying are unchanged, the drying rate and surface temperature of the material remain stable, this stage is called constant speed drying stage; When the wet content of the material decreases to a certain degree, the diffusion rate of the internal wet component to the surface decreases, and is less than the surface vaporization rate, the drying rate is mainly determined by the internal diffusion rate, and decreases with the decrease of the wet content. This stage is called the drying stage of decreasing speed. In addition, technological advances will also reverse the current export of domestic drying equipment. China's drying equipment has not formed an export scale, the export volume is less than 5% of the total, and mainly sold to Southeast Asia. However, according to the authoritative prediction, with the development of technology, the proportion of China's export drying equipment in the total production will increase from 5% to 10% in the next few years, and the export market will also expand from Southeast Asia to Europe and the United States. The large domestic drying equipment manufacturing and the international level there is a large gap between the situation is expected to improve.

air drying system in compressor system Equipment Classification:

Equipment used to perform drying operations. There are many types. According to the operating pressure, it can be divided into normal pressure and decompression (decompression dryer is also known as vacuum dryer). According to the operation method, it can be divided into intermittent and continuous. According to the drying medium can be divided into air, flue gas or other drying media. According to the mode of movement (material movement and dry medium flow), it can be divided into parallel flow, countercurrent and cross-flow.

By operating pressure:

According to the operating pressure, the dryer can be divided into two categories, atmospheric dryer and vacuum dryer, the operation can reduce the moisture of the space in the vacuum steam partial pressure and speed up drying process, and can reduce moisture boiling point and material drying temperature, steam is not easy to leak, so the vacuum dryer is suitable for drying heat sensitive, easy oxidation, explosive and toxic materials, and moisture vapor recovery.

By heating method:

According to the heating mode, the dryer can be divided into convection type, conduction type, radiation type, dielectric type and so on. Flow dryer, also known as direct dryer, is the use of hot dry medium and wet material direct contact, convection transfer heat, and will generate steam away; Conduction dryer, also known as indirect dryer, uses conduction mode to transfer heat from the heat source to the wet material through the metal wall, and the generated wet steam can be removed by decompression suction, through a small amount of purging gas or condensation on the surface of a separately set low temperature condenser. This kind of dryer does not use dry medium, high thermal efficiency, the product is not polluted, but the drying ability is limited by the heat transfer area of the metal wall, the structure is also more complex, often operated under vacuum; The radiant dryer uses various radiators to emit electromagnetic waves in a certain wavelength range, which are selectively absorbed by the wet material surface and then converted into heat for drying; Dielectric dryer is to use high frequency electric field action, so that wet material internal thermal effect for drying.

By exercise mode:

According to the motion mode of wet material, the dryer can be divided into fixed bed type, agitating type, spray type and combined type; According to the structure, the dryer can be divided into van dryer, conveyor dryer, roller dryer, vertical dryer, mechanical stirring dryer, rotary dryer, fluidized bed dryer, air flow dryer, vibration dryer, spray dryer and combined dryer and so on.

air drying system in compressor system Equipment selection:

1. Physical and chemical properties of the material - shape, water content, water properties, crystal water, particle size, bulk density, viscosity, heat sensitivity, softening point, phase change point, thixotropy, toxicity, corrosion, odor, flammability, explosive, electrostatic, gas permeability, agglomerative, crystal or particle easily crushed...

2. Drying characteristics of materials -- drying curve, critical moisture content, balanced moisture content under the condition of selected drying.

3. Drying yield requirements and vision planning.

4. The influence of material commodity value and drying effect on it. Such as product moisture, pollution, temperature, wear, pulverization, crushing, rehydration... The impact of etc on the value of goods.

5. Requirements for material recovery rate.

6. Sequential process of material drying process. (State methods involving feeding and discharging)

7. Past drying methods for materials or similar products.

8. Available heat sources (coal, oil, electricity, gas, liquefied gas, natural gas)

9. Size of installation site and any special requirements.

10. Environmental protection requirements - dust emissions, noise, vibration, odor, volatiles... And so on.

11. The amount of procurement capital that may be invested, local labor, land and energy prices.

12. Operator level and maintenance ability of users.

13. Local average annual temperature and humidity.

Petroleum and chemical industry: polymerization, condensation, distillation, melting, dehydration, forced insulation.

Oil industry: fatty acid distillation, oil decomposition, concentration, esterification, vacuum deodorization.

Synthetic fiber industry: polymerization, melting, spinning, extension, drying.

Textile printing and dyeing work: heat setting, drying, heat capacity dyeing.

Nonwovens industry: nonwovens.

Feed industry: Drying.

Plastics and rubber industry: hot pressing, calendering, extrusion, vulcanization molding.

Paper industry: dry, corrugated paper processing.

Wood industry: multi-composite board, fiberboard pressure molding, wood drying.

Building materials work: drywall drying, asphalt heating, concrete component maintenance.

Machinery industry: spray paint, printing drying.

Food Industry: Baking, heating.

Air conditioning industry: industrial plant and civil building heating. Road construction industry: asphalt melting, insulation.

Pharmaceutical industry: drying.

Light industry: production of ink, washing powder.

Technical Features:

The first is to understand the physical and chemical properties of the dried material and the use characteristics of the product.

The second is to be familiar with the principles of transfer engineering, that is, the principles of energy transfer such as mass transfer, heat transfer, hydrodynamics and aerodynamics.

Third, we should have the means of implementation, that is, we can carry out the engineering design of drying process, main equipment, electrical instrument control and other aspects.

Install the operating

Air drying system in compressor system Installation operation process

I. General provisions

Article 1 The driver of reprinting machine and crusher must be trained to achieve the "three understandings "(understand structure, understand performance and understand origin

Management), "four meetings "(can use, can maintain, can maintain, can deal with faults), passed the training examination, Only after obtaining the qualification certificate can you operate on the post.

Article 2 Closely cooperate with the scraper conveyor driver of the working face and the belt conveyor driver of the transportation lane to unify the signal contact,

When a large lump of coal and gangue accumulate and overflow at the feed port of the crusher in order to open or stop, the work and surface scraper should be stopped

If a large lump of coal or gangue cannot enter the breaking connection or there are metal objects in the conveyor, it must be stopped for processing.

Preparation, inspection and treatment

Air drying system in compressor system Preparation:

1, tools: wrench, pliers, screwdriver, hammer, spade, etc.

2, necessary spare parts: all kinds of short chain, chain ring, bolts, nuts, crusher insurance dowels, etc.

3. Lubricating oil and turbine oil.

Air drying system in compressor system inspection and treatment:

1, motor, reducer, hydraulic coupling, head, tail and other parts of the connection must be complete, intact , fastening reducer, hydraulic shaft joint should be free of oil seepage, oil leakage, the amount of oil should be appropriate;

2, the signal must be sensitive and reliable, no signal is not allowed to start the spray sprinkler device to ensure good condition;

3. Power cables and operating lines must be hung neatly without being squeezed;

4. Coal, gangue, sundries and coal dust of motor and reducer near the nose must be cleaned up;

5, the working face scraper conveyor head and transfer machine tail lap to be appropriate;

6, scraper chain plate critical moderate, scraper and screws must be fully fastened;

7, reprinting machine walking car must be stable and reliable;

8, transfer machine bridge part of the boot, the operation of each part should be without abnormal sound, scraper, chain, connection .The ring should be free of torsion, twist, bending deformation;

9, crusher, crusher at the roadway support must be intact, firm;

10, the safety protection network and protection device of the crusher, to ensure no deformation, no failure, safety and reliability;

11, reprinting machine, crusher at the roadway support must be intact, firm.

Iii. Operation and precautions

Test run

1. Close the magnetic starter handle to send power;

2. Press the button two or three times;

3. Start and idle for 1~2 weeks;

4. Joint operation of reprinting machine and crusher;

5. Check that there is no abnormality and send out startup signal;

6. In operation, the machinery and motor should have no vibration, sound and humidity should be normal, and the temperature of each bearing should not exceed 75℃.

The temperature of the motor shall not exceed the manufacturer's regulations;

7. The chain tightness of the retransmission machine must be consistent. In the case of full load, the chain tightness is not allowed to exceed two chains Ring length, no chain, chain jump phenomenon;

8, the transfer machine connected to the fusible plug or easy to fry the piece damage, do not use wood or other materials instead;

9. The protective net safety device of the crusher should be kept in good condition, and should be checked frequently in the process of work, if there is damage Immediately stop processing;

10, transfer machine tail protection and other safety devices must be intact;

11, transfer machine

(1) Clean up floating coal and gangue in the tail, on both sides of the fuselage and under the bridge;

(2) Protect cables, water pipes and tubing, and hang them neatly;

(3) check the roadway support and transfer machine under the condition of ensuring safety;

(4) The walking car and the tail frame of the belt conveyor should contact well, do not deviate, and lap well after moving and setting, so as to prevent

Large pieces of coal gangue damage tape to ensure smooth coal flow;

(5) After moving the reprinting machine, the nose and tail should be kept flat, straight and stable, and the jack lever should be recovered.