How to improve the temperature of boiling dryer

How to improve the temperature automatic control system of the boiling dryer is to use the original instrument and relay control The upper and lower limit of the heating temperature of the equipment are quite different in the use process, which is not conducive to production The insulation layer on the external surface of the equipment heater is thin, the heat loss in production is large, and the lifting ring steel wire of the dust removal device is easy to break, which causes great trouble in the maintenance process In order to ensure the stability of the equipment performance, how to solve such problems? Boiling dryer technology can be improved After a long-term production, although the structure and performance of the boiling dryer have been improved significantly, and the quality is also improving constantly, but there are still some problems The following is the improvement method combined with production practice I The improved boiling dryer for heat utilization is a kind of air convection drying equipment in form, but there are still large energy consumption and insufficient sealing of the equipment, so measures can be taken to achieve good energy-saving effect (1) Strengthen the sealing effect of the equipment The original hopper of the boiling dryer is connected with the equipment body by plane flange, so the sealing effect is poor After using concave and convex flange connection, the tightness of hopper and equipment body is improved; (3) heat preservation measures are added Add insulation layer to the shell of heat exchanger, the thickness of insulation layer increases from 60mm to 150 mm, greatly reducing heat loss 2 The improvement of the collection and dedusting device the boiling dryer achieves the dedusting effect by shaking the bag through the reciprocating motion of the air cylinder The bag is made of anti-static, non fiber shedding cloth, and the bag is hoisted as a whole The filter bag is connected by clamp connection, and the suspender is made of rigid material which is not easy to deform, so as to effectively prolong the service life of the catching and dedusting device and reduce the maintenance Third, the improvement of the air distribution plate (screen) the air distribution plate in the boiling dryer has two functions, one is to support the material layer, the other is to make the gas distribution uniform The size, shape, distribution situation and opening rate of the holes in the distribution plate all play an important role in the distribution of the fluid The uneven distribution of gas will cause "Circulation" in the bed, which tends to be extremely easy to cause "ditch flow" in some parts of the bed, while the rest parts are dead bed At this time, most of the gas will leave the bed in the form of "ditch flow" along some channels in the bed, making the gas-solid contact worse, which should be avoided A good distributor design should be able to restrain the nonuniformity in the bed, that is, when the pressure drop in some parts of the bed decreases and the air flow speed increases, the resistance produced by the distributor should be able to restrain the increase of the air flow, so as to restrain the deterioration of the fluidization The air distribution plate used in the fluidized bed dryer has a single form, and the vertical perforated plate or sheet mesh plate is used During the fluidization process, the materials are easy to have problems such as uneven fluidization or dead angle, which can not ensure the uniformity of the drugs in the particles, and the single opening form can not meet the production process requirements of different drugs On the other hand, in order to reduce the leakage loss of drugs, the aerodynamic and thermodynamic simulation calculation and verification are carried out for the parameters such as pore distance, pore diameter, opening rate and so on during the design of air distribution plate by using the hydrodynamic model, heat and mass transfer model, so as to meet the production process requirements of different materials In terms of installation mode, the connection mode is made into detachable type to ensure quick installation and thorough and complete cleaning IV improvement of air intake treatment 1 The air intake of hot air is set in the auxiliary machine room and installed together with the heating device The auxiliary machine room and the clean area are not equipped with direct doors and windows The air cleanliness level of the auxiliary machine room is often low, which will affect the quality of medical hot air The equipment itself is required to have a good purification device, otherwise, the raw air will pollute the drugs, and it is difficult to meet the GMP requirements 2 The air treatment unit of the equipment is configured as: primary effect filter medium effect filter (sub) filter Although the air treatment system is equipped with primary, intermediate and filter, the filter will be blocked or damaged with the increase of operation time At present, it can only be identified from the appearance to determine whether it needs to be replaced, lacking of theoretical basis Early replacement will increase the cost, and late replacement will bring the risk of air quality decline, thus affecting the quality of products 3 In addition, if the induced draft fan of the boiling dryer is not linked with the air valve, it will cause air backflow between the fan shutdown and the butterfly valve closure The start and stop of the fan are linked with the switch of the air valve When the fan is started, the air valve is opened at the same time When the fan is stopped, the air valve is closed at the same time to ensure that there is no air backflow V the improvement of the control system the operation parameters of the fluidized bed dryer are mainly set by the experience of the operators, but it can fully realize the intellectualization and the traceability of the process parameters, which puts forward higher requirements for the electrical control system of the equipment In the electrical control system, a series of devices are needed to detect the temperature, pressure, differential pressure, operation time and get the basic data Then, the data is transmitted and stored in the touch screen through the transmitter, and the data is stored and analyzed by the touch screen, and then a suitable process line is developed to realize the intelligent control Vi the temperature control hot air heating control mode adopts simple "on" and "off" modes When the temperature reaches the set value, the steam will be stopped, but the heat exchanger still has residual heat to make the air temperature continue to rise, and vice versa, which will cause excessive temperature fluctuation and affect the drying quality of the equipment Through the transformation and processing of the temperature signal by PLC, the opening and closing of the steam valve is controlled to realize the closed-loop control of the temperature, so as to achieve the purpose of self-control The size of the steam flow valve is controlled to maintain the inlet air temperature At the beginning of the temperature rise, the steam flow is large, so that the inlet air temperature is close to the set value as soon as possible, and then the steam flow is automatically adjusted to slowly approach the set value, and the stable steam is maintained after Zui Keep the air inlet temperature stable Starting from the working principle of the boiling dryer, combined with some problems in the production process, and the improvement of equipment technology, the part of the improvement of dust catching device, temperature and air inlet filter device can better meet the production requirements The workload of the original system transformation is small, the original equipment does not need major changes, the investment is small, and the return is large Benefit Zui!