CN103954112A - Production process and curing drying equipment for solar polycrystalline silicon quartz crucible - Google Patents
Production process and curing drying equipment for solar polycrystalline silicon quartz crucible Download PDFInfo
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- CN103954112A CN103954112A CN201410164992.1A CN201410164992A CN103954112A CN 103954112 A CN103954112 A CN 103954112A CN 201410164992 A CN201410164992 A CN 201410164992A CN 103954112 A CN103954112 A CN 103954112A
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Abstract
A production process and curing drying equipment for a solar polycrystalline silicon quartz crucible solve the problem that the wall thickness of the existing crucible is not uniform, the thermotechnical curing equipment cannot achieve the set process demands and the like. The production process is characterized in that the an organic monomer is added in quartz ceramic mud and a crucible product is obtained after the quartz ceramic mud is molded in a nonporous die; the process flow comprises the steps of melting a high-purity quartz raw material, preparing the quartz ceramic mud, pouring, solidifying and molding, curing and drying, sintering, detection, packing obtaining a finished product and storing in a warehouse. The kiln body of the curing drying equipment is of a three-layer structure, temperature measuring holes, humidity measuring holes, pressure measuring holes, hot air regulating holes and observation doors are arranged at two sides of a kiln wall of each layer of roller kiln; a circulation air pipeline, a hot air supplying pipeline, a damp air discharging pipeline and a cooling air pipeline are arranged above a metal frame; distributed control is performed by adopting a full integration automated control system, the waste heat of the a kiln furnace is furthest used under the condition of ensuring the drying quality of the quartz crucible product, and the aims of energy saving and cost reducing are achieved.
Description
One, technical field
The invention belongs to Thermal Equipment, relate in particular to a kind of production technology for solar energy polycrystalline silicon silica crucible and maintenance drying equipment thereof.
Two, background technology
Quartz ceramic crucible is to be used for loading polycrystalline silicon material in solar energy polycrystalline silicon ingot casting production process, the container of production and application under 1600 DEG C of high temperature.Its service condition harshness, technical property requirements is high, is irreplaceable crucial consumable material in polycrystalline silicon ingot casting production process.
Regular size is 720 types and 900 types at present, further to the 1100 type development of maximizing.
Quartz ceramic crucible more than 50 hours, makes it fusing, long brilliant as loading the continuous operation under 1600 DEG C of high temperature of the container of polycrystalline silicon material, and purity, intensity, outward appearance and inherent quality to crucible, high-temperature behavior, dimensional accuracy etc. have very strict requirement.Adopt crucible that quartz-ceramics gel-casting technology produces with unique homogeneous texture and the porosity of Lve Gao, make crucible product good thermal shock stability, anti-to burst ability strong.And unique surface texture and appropriate surface roughness, be particularly suitable for the spraying of silicon nitride coating, form coating and be not easy to peel off.According to the technological requirement of polycrystalline silicon ingot casting, the silicon material melting is in long brilliant process, and crucible wall has certain heat insulation effect, and is heated and wants evenly, so sidewall is thicker, crucible is conducive to the long brilliant of silicon material uniformly up and down.And be at present all to adopt traditional roller kilns conventionally for the production of the Thermal Equipment of quartz ceramic crucible, because its furnace cavity is excessive, crucible pile up interior be difficult to reach be heated, dry evenly, be often difficult to reach requirement and the product quality that affects calcining kiln.
Three, summary of the invention
Object of the present invention be exactly for market provides that a formula is reasonable, technique is advanced, scientific structure, the saving energy be for production technology and the maintenance drying equipment thereof of solar energy polycrystalline silicon silica crucible.
Technical scheme of the present invention is: for the production technology of solar energy polycrystalline silicon silica crucible, in quartz-ceramics mud, to add a kind of organic monomer, in non-punch die, after moulding, directly solidify and obtain crucible product, fired and formed by Thermal Equipment, whole silica crucible casting molding technique flow process is: high-purity vitreous silica raw material (adding organic monomer) → prepare the solidification forming → maintenance of quartz-ceramics slip → note be dried → to burn till → detect → pack → finished product → warehouse-in.
Described maintenance drying equipment comprises the parts such as the wet butterfly valve actuator of the metal framework, Yao Qiang, Yao Ding, stainless steel rider rod, heat supply airduct, humidity discharging airduct, circulation airduct, cooling duct and the temperature control/control that are welded into by column, kiln body is separated into upper strata maintenance roller kilns, middle level maintenance roller kilns and lower floor's maintenance roller kilns up and down, the Yao Qiang both sides of every layer of roller kilns arrange thermometer hole, hygrometric hole, pressure tap and hot blast adjustment hole and observe door, at the bottom of Yao Qiang, kiln, kiln top and middle part demarcation strip all adopt rock cotton board to fix with heat resisting steel securing member, and lined aluminum plate, before and after kiln body, be divided into heat up section, dryer section and cooling section three parts, described intensification section is provided with circulated air device, it is to form by being arranged on circulation airduct, the circulated air arm of metal framework top and and be connected circulating fan and being provided with the wet major cycle airduct of butterfly valve YE of temperature control/control, and this circulating fan is connected with the heat-condutive oil heat exchanger air outlet of the residual neat recovering system of calcining kiln, described dryer section front middle part is provided with moisture discharge device, postmedian is provided with hot air supplier, moisture discharge device is by the moisture-eliminating blower that is arranged on metal framework top, be provided with the humidity discharging airduct and the humidity discharging wind arm that is arranged on Yao Qiang both sides of the wet butterfly valve YE of temperature control/control, the multiplexing arm composition of humidity discharging, hot air supplier is by the heat supply blower fan that is arranged on metal framework top, heat supply airduct and the hot wind supply arm composition that is arranged on Yao Qiang both sides, the entrance point of heat supply blower fan is connected with the heat-condutive oil heat exchanger ajutage of the residual neat recovering system of calcining kiln, the air outlet of hot wind supply arm is arranged on respectively the damper place of stainless steel rider rod below, three layers of roller kilns bottom, cooling section be provided with by the cooling air that is arranged on metal framework top extract out mouthful, cooling duct and the cooling air arm that is provided with Yao Qiang both sides form, and adopt automation control system to carry out collecting and distributing control to the atmosphere in curing kilns.Described automation control system is using Siemens's fully integrated automation controller of SIMATIC S7 as main control device, to workshop level Kiln Control System and KXG, realize the data communication of workshop level production equipment control system by Ethernet mail message.
Beneficial effect of the present invention is: not only formula is reasonable, craft science, and the dry main thermal source of silica crucible maintenance is from the waste heat oil of calcining kiln, the another design and installation of supplemental heat source the combustor of Italian brand, movement system (main transmission, turnover kiln machine, three layers of movable platform, individual layer elevator) full-automatic running continuously, has has separately digested and assimilated the drying control technical characterstic of German KELLER company and has formulated the dry maintenance scheme of this maintenance roller kilns UTILIZATION OF VESIDUAL HEAT IN.By heating and moistening system by note solidification forming silica crucible moisture content from enter 12% of kiln reduce to kiln discharge≤2%, control crucible product dry dimensional accuracy, intensity, prevent bursting of product, can enter into next firing process and burn till out qualified crucible product.Tool has the following advantages:
1, at the bottom of three layers of maintenance roller kiln wall, kiln and kiln top all adopts rock cotton board, and fastening with heat resisting steel securing member, and each kiln road liner is aluminium sheet, can reach heat insulation, every wet effect.On kiln body of wall, be provided with glass window and hand-hole, can every layer of kiln of emergency processing in catastrophic failure;
2, utilize the deep fat of Medium Oil heat exchanger in calcining kiln waste heat airduct to add the dry use of warm-air supply curing kilns, heat supply blower fan is stainless steel blower fan, has ensured that the hot blast of sending into does not contain any impurity that can pollute crucible product;
3, can continous way enter kiln maintenance, the three layers of curing kilns crucible daily output >=135 of single seat;
4, silica crucible maintenance qualification rate 100%;
5, the main transmission of every layer of maintenance roller kilns all adopts the stainless steel rider rod of Φ 65mm;
6, movement system all adopts PLC+ Frequency Converter Control, completely carries out interlocking of signals, reaches and operates steadily, and does not shake, and has ensured the intact and handling safety of product, and main transmission can power frequency/frequency conversion be exchanged operation;
7, every layer of maintenance roller kilns are divided into 6 active sections, and the interior circulation wind speed of temperature/humidity, pressure, section of every section all can be controlled separately.A section is intensification dryer section, point platen press constant humidity, and B-E section is dryer section, and ladder rises temperature control and control is wet, and F section is balance cooling section;
8, heat up the temperature/humidity control of section by heat-condutive oil heat exchanger, hot blast injection/withdrawing device, electronicly mixes the multiplexing butterfly valve of new wind butterfly valve/humidity discharging and corresponding temperature and humidity measure transducing unit forms.Because goods are when through this section, suppress the too fast dry partial vapour pressure of product surface by forming, when goods are heated up by room temperature, the migration velocity of internal moisture is higher than the evaporation rate of product surface, prevent the generation of face crack, the effect of hot blast injection/withdrawing device be force air-flow in this section, form in circulation counter-current drying pattern.Humidity/the temperature of circulating current can, by technological requirement, be injected butterfly valve by hot blast, mixes mutual coupling and the humidity discharging butterfly valve of new wind butterfly valve and automatically controls;
9, the temperature/humidity control of dryer section is by hot blast injection device, and humidity discharging butterfly valve and corresponding temperature and humidity measure transducing unit form.Drying control subsystem, to the temperature/humidity instruction of assigning through technical recipe, drives corresponding external equipment, and the temperature/humidity of this section is accurately controlled.Crucible product carries out the controlled constant rate of drying in this section, and drying medium is through the kiln tail cooling-air of combustor heat-exchanger rig heating and the discharged air of pumpback.Entering in kiln after temperature/humidity control, goods are dried, product dried speed is by entering kiln air quantity, and wind-warm syndrome and humidity discharging butterfly valve opening are controlled;
10, curing kilns pressure control subsystem is divided into preparation section and balancing segment pressure control, prepare section furnace pressure by circulated air motor inverter, electronic new wind butterfly valve, the multiplexing butterfly valve of humidity discharging mixed, micro-pressure sensor and corresponding control loop composition, to the closed-loop control of carrying out of this section of furnace pressure.To control the gas flow rate in kiln, stablize temperature/humidity and the pressure working condition of dry kiln.The pressure control of balancing segment is by hot blast injection device, humidity discharging butterfly valve and corresponding temperature, and pressure detecting transducing unit forms.In controlling temperature, balanced kiln external and internal pressure, avoids the impact of environmental change on curing kilns operating mode;
11, single seat maintenance dry kiln disposes 27 of measurement and control of temperature points, 4 of humidity measuring control points, 5 of 13 of pressure testing and controlling points and supplemental heat source measuring control points;
12, control accuracy:
Temperature: A-E active section: ± 1 DEG C
Humidity: A. heat up section: ± 4 % y.VOL/kg
Humidity: B-D active section: ± 3 % RH
13,the electrical control of curing kilns control system scheme is hard/" fully integrated automation " mode (SIMATIC S7) that software platform has adopted (moral) Siemens Company to advocate.Control software programming and adopt the Liao Jiwo company Advanced process control technical software platform kernel that drying control engineering rich experiences are researched and developed in recent years.Reliability control system is strong, the inefficacy of the main control device-SIMATIC S7 using due to native system itself damages the control fault almost nil (fault-free is greater than 60,000 hours interval time) causing, and the advanced fault-toleranr technique such as S7 has taked in program operating mechanism that dynamic diagnosis, instruction repeat, program roll-back, ensure master control system reliability service;
14, system is furnished with large screen display, mouse, operation keyboard, operating personnel can enter people with the password of appropriate level---machine dialog interface, drawer kiln plant is carried out to the operation of different stage, as the configuration again of the change of the amendment of technique sintering curve, running status, system, etc.People---the principle of the ergonomic design of machine dialog interface, succinctly practical, and have multi-form warning for faulty operation, so that carry out to refusal;
15, select temperature, the humidity display transmitter of taking field bus technique, and can be arranged on scene, convenient operation personnel observe nearby and regulate relevant fine tuning valve, have improved the real-time/accuracy of temperature/humidity regulation;
16, active station has been selected high-performance computer, can be to the technical recipe in active station, and product drying historical record, the significant datas such as quality of production management data carry out highly reliable protection.Can preserve 24 months, and can make at any time backup for long-term preservation.The realization of this database can promote the perfect of total Quality Control System;
17, system has been reserved the data-interface connecting with infrared thermography, can, by workpiece thermal map picture and temperature data (resolution: 5 X 6 mm) the automated import of data storehouse measured through the multiple observation windows that are distributed on maintenance dry kiln, generate historical record.And can answer the temperature/humidity data of period synchronously to generate historical data report by homophase, in order to adjusting and the quality of item management of curing kilns.
18, warning and accident treatment function are strong, and the accessible monitoring, alarming point of this system can reach 256, and user can set arbitrarily the alarm limit of monitoring value, there is the time of transfiniting, control system will be used acousto-optic hint to report to the police, and adjustable accidents happened processes picture, record the process of accident treatment simultaneously.
Below in conjunction with accompanying drawing, the invention will be further described.
Four, brief description of the drawings
Fig. 1 is rise segment of temperature structure schematic diagram of the present invention;
Fig. 2 is dryer section structural representation of the present invention;
Fig. 3 is cooling section structural representation of the present invention
Fig. 4 is dryer section cross section structure schematic diagram of the present invention.
In figure: 1 is upper strata maintenance roller kilns, 2 is middle level maintenance roller kilns, 3 is lower floor's maintenance roller kilns, 4 is column, 5 is stainless steel rider rod, 6 is kiln top, 7 is major cycle airduct, 8 is circulation airduct, 9 is circulated air arm, 10 is thermometer hole, 11 is hygrometric hole, 12 is pressure tap, 13 is moisture-eliminating blower, 14 is humidity discharging airduct, 15 is humidity discharging wind arm, 16 is the multiplexing arm of humidity discharging, 17 for observing door, 18 is the wet butterfly valve YE of temperature control/control, 19 is heat-condutive oil heat exchanger ajutage, 20 is heat supply blower fan, 21 is heat supply airduct, 22 is hot wind supply arm, 23 is cooling air extraction mouthful, 24 is cooling duct, 25 is cooling air arm, 26 is crucible, 27 is damper, 28 is kiln wall, 29 is rock cotton board, 30 is aluminium sheet, 31 be kiln at the bottom of.
Five, detailed description of the invention
The present invention adds a kind of organic monomer in quartz-ceramics mud, in non-punch die, after moulding, directly solidify and obtain crucible product, fired and formed by Thermal Equipment, whole silica crucible casting molding technique flow process is: high-purity vitreous silica raw material (adding organic monomer) → prepare the solidification forming → maintenance of quartz-ceramics slip → note be dried → to burn till → detect → pack → finished product → warehouse-in.
Maintenance drying equipment is taking three layers of continuous maintenance roller kilns building a long 36m of kiln as example, three-decker that full kiln is setting up and down, and front and back are totally 16 joints, and 1～5 joint is for for the section that heats up, 5～15 joints are dryer section, and 16 joints are cooling section.Kiln wall 28 both sides of every layer of roller kilns arrange thermometer hole 10, hygrometric hole 11, pressure tap 12 and hot blast adjustment hole 27 and observe door 17, and full kiln disposes 27 of thermometer holes, 4, hygrometric hole, 5 of 13 of pressure taps and supplemental heat source measuring control points; On every side kiln wall 28, be designed with 21 and observe door 17 and multiple damper 27.With per hour enter 2 900 × 900 × 540mm type crucibles of single layer arranging calculate, 144 this type crucibles of tri-layers of curing kilns energy of 36m every day maintenance.At the bottom of kiln wall 28, kiln 31, kiln top 6 and middle part demarcation strip all adopt rock cotton board 29 to fix with heat resisting steel securing member, and lined aluminum plate 30.The section that heats up is provided with circulated air device, it is to form by being arranged on circulation airduct 8, the circulated air arm 9 of metal framework top and and be connected circulating fan and being provided with the wet major cycle airduct 7 of butterfly valve YE 18 of temperature control/control, and this circulating fan is connected with the heat-condutive oil heat exchanger air outlet of the residual neat recovering system of calcining kiln.Described dryer section front middle part is provided with moisture discharge device, and postmedian is provided with hot air supplier.Moisture discharge device by be arranged on metal framework top moisture-eliminating blower 13, be provided with the wet humidity discharging airduct 14 of butterfly valve YE 18 and the multiplexing arm 16 of humidity discharging wind arm 15, humidity discharging that is arranged on kiln wall 28 both sides of temperature control/control and form.Hot air supplier is made up of the hot wind supply arm 22 that is arranged on heat supply blower fan 20, the heat supply airduct 21 of metal framework top and is arranged on Yao Qiang both sides, the entrance point of heat supply blower fan 20 is connected with the heat-condutive oil heat exchanger ajutage 19 of the residual neat recovering system of calcining kiln, and the air outlet of hot wind supply arm 22 is arranged on respectively damper 27 places of stainless steel rider rod 5 belows, three layers of roller kilns bottom.Cooling section be provided with by the cooling air that is arranged on metal framework top extract mouthfuls 23 out, cooling duct 24 and the cooling air arm 25 that is provided with Yao Qiang both sides form, and adopt automation control system to carry out collecting and distributing control to the atmosphere in curing kilns.Described automation control system is using Siemens's fully integrated automation controller of SIMATIC S7 as main control device, to workshop level Kiln Control System and KXG, realize the data communication of workshop level production equipment control system by Ethernet mail message.
The dry complex control system of waste heat that the above-mentioned SIMATIC of being based upon S7 controls on platform has ensured user humidity, the isoparametric strict technology control of temperature in crucible maintenance processes effectively.Of the present invention coming into operation, can realize wetness in curing kilns controlled, makes stay in grade, dimensionally stable, precision and the good strength of crucible, and can utilize to greatest extent using residual heat from kiln furnace, reaches energy-conservation object.
Claims (3)
1. the production technology for solar energy polycrystalline silicon silica crucible, it is characterized in that: in quartz-ceramics mud, add a kind of organic monomer, in non-punch die, after moulding, directly solidify and obtain crucible product, fired and formed by Thermal Equipment, whole silica crucible casting molding technique flow process is: high-purity vitreous silica raw material adds organic monomer → prepare the solidification forming → maintenance of quartz-ceramics slip → note be dried → to burn till → detect → pack → finished product → warehouse-in.
2. a maintenance drying equipment of producing for solar energy polycrystalline silicon silica crucible, it comprises the metal framework being welded into by column (4), kiln wall (28), kiln top (6), stainless steel rider rod (5), heat supply airduct (21), humidity discharging airduct (14), circulation airduct (8), cooling duct (24) and the temperature control/control butterfly valve actuator (18) that wets, it is characterized in that: kiln body is separated into upper strata maintenance roller kilns (1) up and down, middle level maintenance roller kilns (2) and lower floor's maintenance roller kilns (3), kiln wall (28) both sides of every layer of roller kilns arrange thermometer hole (10), hygrometric hole (11), pressure tap (12) and hot blast adjustment hole (27) and observation door (17), kiln wall (28), at the bottom of kiln (31), kiln top (6) and middle part demarcation strip all adopt rock cotton board (29) to fix with heat resisting steel securing member, and lined aluminum plate (30), before and after kiln body, be divided into heat up section, dryer section and cooling section three parts, described intensification section is provided with circulated air device, it is and is connected circulating fan and to be provided with wet major cycle airduct (7) formation of butterfly valve YE (18) of temperature control/control by being arranged on circulation airduct (8), the circulated air arm (9) of metal framework top, and this circulating fan is connected with the heat-condutive oil heat exchanger ajutage of the residual neat recovering system of calcining kiln, described dryer section front middle part is provided with moisture discharge device, postmedian is provided with hot air supplier, moisture discharge device is by the moisture-eliminating blower (13) that is arranged on metal framework top, be provided with the humidity discharging airduct (14) of the wet butterfly valve YE (18) of temperature control/control and be arranged on the humidity discharging wind arm (15) of kiln wall (28) both sides, the multiplexing arm of humidity discharging (16) composition, hot air supplier is by the heat supply blower fan (20) that is arranged on metal framework top, heat supply airduct (21) and be arranged on hot wind supply arm (22) composition of Yao Qiang both sides, the entrance point of heat supply blower fan (20) is connected with the heat-condutive oil heat exchanger ajutage (19) of the residual neat recovering system of calcining kiln, the air outlet of hot wind supply arm (22) is arranged on respectively the damper (27) of three layers of stainless steel rider rod in roller kilns bottom (5) below and locates, cooling section is provided with the cooling air arm (25) of being extracted out mouthful (23), cooling duct (24) and being provided with Yao Qiang both sides by the cooling air that is arranged on metal framework top and forms, and adopts automation control system to carry out collecting and distributing control to the atmosphere in curing kilns.
3. solar energy polycrystalline silicon silica crucible continous way maintenance roller kilns according to claim 2, it is characterized in that: described automation control system is using Siemens's fully integrated automation controller of SIMATIC S7 as main control device, to workshop level Kiln Control System and KXG, realize the data communication of workshop level production equipment control system by Ethernet mail message.
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| CN107976021A (en) * | 2017-11-24 | 2018-05-01 | 岑溪市辰运生态农业开发有限公司 | A kind of drying unit for granulated sugar tangerine orange peel to open the door more |
| CN109269264A (en) * | 2018-09-18 | 2019-01-25 | 芜湖杨燕制药有限公司 | A kind of heated-air circulation oven of insect-expelling saligna injection liquid production |
| CN114396799A (en) * | 2022-01-17 | 2022-04-26 | 安徽省交通控股集团有限公司 | Temperature bin-dividing control equipment for steam curing kiln and self-adaptive control method |
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Application publication date: 20140730 |