Granulating process conditions needed for the main means in the process of particle to suppress the rationality of the arrangement of technology and operation technology of integrity. Its main including incoming flow control, steam quality control, granulating conditioning time control aspects of factors, this article only to do some analysis and discussion.

1, the Granulator material flow control

In order to make the Granulator is balanced in the process of granulating work at full capacity, must be made into the Granulator feeder material flow to meet granulating needs, especially the feed structure to effectively eliminate the feed due to reasons such as "arch intermittent phenomenon, and in the actual production by adjusting the speed of the feeder to control the actual feed rate. In order to ensure that into the feeder material flow stability, reasonable arrangement is directly above the Granulator to a storage hopper, hopper capacity should be Granulator requirements about a quarter of an hour, before mixing of powder after ascending the chute through direct access to the hopper. If you do not set this buffer hopper, it will be difficult to guarantee the stability of material flow. Many operators in granulating productivity when normal just find reason for Granulator itself is neglected the material factors, in fact, when a lot of productivity is caused by the incoming flow instability.

In general, when the Granulator smooth operation is normal, steam supply sufficient, feed valve is opened entirely, feeder speed transferred to the rating and the main motor work is always short of rated current, can determine the incoming flow. Should then find out the reason, treats syndrome: (1) if due to the limitation of space condition, does not increase the buffer hopper, should try to increase the chute feed diameter and Angle; (2) if the chute feed due to several times to break the arch should be timely when plastic deformation or replacement; (3) conditioning feeding design is unreasonable, channeling gas into the bin, etc.

2, Granulator modulator steam quality control

Using steam granulating, can effectively improve the Granulator yield and grain quality, but how to ensure the quality of the saturated steam into the Granulator modulator, is a very important factor, in general powder Feed after pelleting before steam conditioning, the temperature is not lower than 70 ℃, water content at about 15.5%, granulating effect is better at this moment. If the room temperature at 25 ℃ or so, raw material moisture content was 12% on average, after tempering, temperature increased by more than 45 ℃, water increased by about 3.5%.

When the room temperature is 25 ℃, material absorbs 175 kg after saturated steam temperature can exceed 62 ℃. In addition, the material temperature rise is also influenced by other factors: (1) conditioning heat conduction effect of high temperature components for material; (2) after steam condensation water in continue releasing heat in the process of cooling effect. In fact, after the steam into the modulator, due to the contact with air and steel parts, consumes a significant number of quality and quantity of heat; Material moisture and temperature too low, should be more steam. Under normal circumstances the biggest granulating productivity of 5% ~ 6% to calculate the steam consumption is reasonable.

Saturated vapor pressure of provisions shall be applicable to 0.2 ~ 0400000 mpa. Pressure too low, within the prescribed conditioning time reach conditioning index; Pressure is too high, also has a high steam temperature, steam by conditioning components for material thermal conduction heating phenomenon obviously accelerated, easy to cause the material temperature, moisture content is low, the defect of local material anxious burnt, affect the quality of granulating.

3, Granulator conditioning time control

Conditioning device is the key of the Granulator unit, its structure is similar to ordinary screw conveyor, with adjustable blade type spiral blade, the rotating speed is 300-400 RPM, with steam from the steam inlet on the cylinder to add and strong stirring, make the material in a short time to heat up, add water, and then transmitted to the granulating crushing chamber. Material conditioning effect except and steam adding relevant conditioning time is also an important factor. The ideal conditioning time is when the coefficient of material is not less than 0.5, the conditioning throughput can meet the needs of granulating, material in the residence time in quenched and tempered. Due to the Granulator size restrictions, impossible to extend the conditioning time and the diameter and length of quenched and tempered do too much, but can be by adjusting the blade with shaft Angle to extend or shorten the retention time of a material in the quenched and tempered. When different aperture die, operators, blade Angle can be adjusted according to actual productivity, in order to obtain the tempering time required. If different die die change frequently, is not always the blade, so as not to take up too much production time. Especially when raw material is coarser, such as CaiBing, cottonseed cake, for the larger proportion of toppings, material particle size and large, should guarantee the tempering time as far as possible, in order to achieve the softening materials, reduce the resistance, the purpose of improving the quality and productivity of granulating.

In a word, to get the best production and best quality of pellet Feed, we must grasp the granulating performance of raw material, and choose the most suitable process conditions and performance good equipment, in order to obtain particle Feed the highest productivity and high quality.

Note: this article from zhengchang group website.

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