CN117537604A - Novel energy-saving environment-friendly closed ring type roasting furnace continuous production system and process method - Google Patents

Novel energy-saving environment-friendly closed ring type roasting furnace continuous production system and process method Download PDF

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Publication number
CN117537604A
CN117537604A CN202311522572.1A CN202311522572A CN117537604A CN 117537604 A CN117537604 A CN 117537604A CN 202311522572 A CN202311522572 A CN 202311522572A CN 117537604 A CN117537604 A CN 117537604A
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China
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roasting furnace
roasting
furnace chamber
temperature
furnace
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CN202311522572.1A
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Chinese (zh)
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石贵祥
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Linzhou Hengtu New Materials Technology Co ltd
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Linzhou Hengtu New Materials Technology Co ltd
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Priority to CN202311522572.1A priority Critical patent/CN117537604A/en
Publication of CN117537604A publication Critical patent/CN117537604A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type or of the type in which a segmental kiln moves over a stationary charge
    • F27B13/02—Furnaces with both stationary charge and progression of heating, e.g. of ring type or of the type in which a segmental kiln moves over a stationary charge of multiple-chamber type with permanent partitions; Combinations of furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type or of the type in which a segmental kiln moves over a stationary charge
    • F27B13/06—Details, accessories or equipment specially adapted for furnaces of this type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type or of the type in which a segmental kiln moves over a stationary charge
    • F27B13/06—Details, accessories or equipment specially adapted for furnaces of this type
    • F27B13/08—Casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type or of the type in which a segmental kiln moves over a stationary charge
    • F27B13/06—Details, accessories or equipment specially adapted for furnaces of this type
    • F27B13/08—Casings
    • F27B13/10—Arrangements of linings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type or of the type in which a segmental kiln moves over a stationary charge
    • F27B13/06—Details, accessories or equipment specially adapted for furnaces of this type
    • F27B13/12—Arrangements of heating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type or of the type in which a segmental kiln moves over a stationary charge
    • F27B13/06—Details, accessories or equipment specially adapted for furnaces of this type
    • F27B13/14—Arrangement of controlling, monitoring, alarm or like devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/10—Arrangements for using waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/20—Arrangements for treatment or cleaning of waste gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/30—Arrangements for extraction or collection of waste gases; Hoods therefor
    • F27D17/302—Constructional details of ancillary components, e.g. waste gas conduits or seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D5/00—Supports, screens or the like for the charge within the furnace
    • F27D5/0006—Composite supporting structures
    • F27D5/0012—Modules of the sagger or setter type; Supports built up from them

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Furnace Details (AREA)

Abstract

本发明公开了一种新型节能环保密闭环式焙烧炉连续生产系统及工艺方法，其相邻的两个所述焙烧炉室中，前一个所述焙烧炉室的底部通过烟气管道与后一个所述焙烧炉室的上部连通，所述烟气管道上设置有阀门，以此类推，使所有的所述焙烧炉室串联在一起；所述焙烧炉室均采用空心窑炉结构，外层为钢结构支撑，内置陶瓷耐火纤维保温，在匣钵内装产品焙烧生产；采用天然气作为原料自动配风燃烧升温系统控制含氧量，从串联末端低温炉室引出的有害烟气经循环风机排入前端高温炉室焚烧处理，形成闭环对各个炉室加热升温高效焙烧，焙品进入耐热钢筒匣钵中装出炉作业等新的生产操作模式，使整个密闭环式焙烧炉在节能、环保新型技术开发方面实现革命性的突破。

The invention discloses a new type of energy-saving, environmentally friendly and closed-loop roasting furnace continuous production system and process method. Among the two adjacent roasting furnace chambers, the bottom of the former roasting furnace chamber is connected to the latter one through a flue gas pipe. The upper part of the roasting furnace chamber is connected, and the flue gas pipe is provided with a valve, and so on, so that all the roasting furnace chambers are connected in series; the roasting furnace chambers all adopt a hollow kiln structure, and the outer layer is Steel structure support, built-in ceramic refractory fiber insulation, product roasting production in the sagger; natural gas is used as raw material, automatic air distribution combustion and heating system to control oxygen content, harmful smoke drawn from the low-temperature furnace room at the end of the series is discharged into the front end through a circulating fan The high-temperature furnace chamber is incinerated to form a closed loop to heat each furnace chamber for efficient roasting, and new production operation modes such as the baked goods entering the heat-resistant steel cylinder sagger for loading and unloading operations make the entire closed-loop roasting furnace a new energy-saving and environmentally friendly technology. A revolutionary breakthrough in development.

Description

Novel energy-saving environment-friendly closed ring type roasting furnace continuous production system and process method
Technical field:
the invention relates to a production technology of carbon products, in particular to a novel energy-saving environment-friendly closed ring type roasting furnace continuous production system and a process method.
The background technology is as follows:
the products to be baked formed by using coal pitch or petroleum pitch and organic resin as binders and carbonaceous aggregates and powder particles all need high-temperature roasting heat treatment in a specially designed heating furnace to form the carbon products, and the carbon products have higher mechanical strength, lower resistivity, better thermal stability and chemical stability.
The roasting is generally carried out by adopting natural gas and coal gas, and the roasting production period is longer, the energy consumption is higher, the roasting quality of the product has larger influence on the quality of the finished product and the yield of the post-process, and the selection of which high-performance roasting furnace is used for processing is important. The firing is divided into a primary firing and a secondary firing, and the firing of the molded green article is called primary firing and the secondary firing of the impregnated article after the primary firing is called secondary firing. During primary roasting and heating, the performance, the selection and the like of the roasting filling materials are important for the decomposition, the polycondensation, the carbonization of the binding agent, the change of the green body form, the roasting temperature system, various types of roasting furnaces and the process characteristics of the roasting furnaces; when the secondary roasting is carried out, the temperature of the carbonization process of the impregnant (coal-based or petroleum-based asphalt and resin) in the roasting is lower than that of the primary roasting, and the roasting temperature rise system is not strictly controlled. Both roasting can produce a large amount of harmful smoke, and strict control is required in environmental protection.
At present, kiln technology introduced from abroad is adopted for roasting, such as a ring type roasting furnace or a car hearth furnace is adopted for primary roasting, and a tunnel kiln is adopted for secondary roasting, so that the method has the advantages and the disadvantages of the method. The ring furnace is an open furnace or a ring furnace with a cover, and has the advantages that: the independent hot flue gas of the furnace chamber can be in series ring type operation, and the flue gas of the high-temperature furnace chamber preheats the low-temperature furnace chamber so as to effectively utilize a part of heat; the defects are that each production period is from room temperature to high temperature, the heat storage loss of the roasting furnace body of the furnace chamber accounts for more than 50% of the heat expenditure in each roasting process, and the standard discharge treatment of harmful smoke is difficult.
The bottom furnace has the advantages that the sagger is used for loading the product to be roasted, the primary roasting is carried out at the temperature of about 850 ℃, and the secondary roasting is carried out at the temperature of about 700 ℃. The highest flue gas temperature of the ring-type roasting furnace is about 200 ℃ lower than that of the ring-type roasting furnace, the generation of NOx can be effectively reduced, the ring-type roasting furnace is convenient to charge and discharge, and a multifunctional travelling crane is not required to be additionally arranged; the defects are that the heat can not be effectively utilized, the energy consumption is high, and the discharged harmful flue gas is difficult to treat after reaching the standard.
The tunnel kiln has the advantages that the production period is short, the efficiency is higher, the volatile matters in the heating process of the baked products can be combusted for a second time to recycle heat, the energy consumption is lower, and the harmful volatile matters are combusted at a high temperature, so that the emission reaching the standard is easier; the method has the defect that the temperature in the roasting process from low temperature to high temperature cannot be precisely controlled by heating, and the method can only be used for secondary roasting of impregnated products.
At present, the energy-saving emission-reducing and environmental protection policies of China are taken as a basic national policy, and the roasting production must develop towards the more optimized direction of automation, high efficiency, energy conservation and environmental protection, and the way of clean production and green development is provided. Through the analysis of the advantages and disadvantages of the three advanced roasting kilns and the summary of production practice, a novel energy-saving environment-friendly closed ring type roasting furnace is developed and designed. The method comprises the steps of analyzing heat balance project data of the roasting kiln, starting with a kiln operation heat loss project, clearly designing an energy-saving environment-friendly project, carrying out new energy-saving and emission-reduction technical research on the heat loss project of the roasting kiln, and carrying out new environment-friendly technical research according to production characteristics of the roasting kiln and a target of controlling waste gas emission. The novel energy-saving environment-friendly closed ring type roasting furnace is innovatively developed, a novel hollow kiln structure is adopted, the steel structure of the outer layer of the whole furnace body is supported, ceramic refractory fibers are built in for heat preservation, and the roasting production of products in a sagger is utilized; the natural gas is adopted as a raw material to control the oxygen content by an automatic air distribution combustion temperature rising system, and harmful smoke gas led out from a low-temperature furnace chamber at the tail end of the serial connection is discharged into a high-temperature furnace chamber at the front end to be burnt by a circulating fan, so that a closed loop is formed to heat each furnace chamber for high-efficiency roasting; the baked products enter new production operation modes such as loading and unloading operation in the heat-resistant steel cylinder sagger, so that the whole closed ring type baking furnace realizes revolutionary breakthrough in the aspect of energy-saving and environment-friendly novel technology development.
The invention comprises the following steps:
the technical problems to be solved by the invention are as follows: overcomes the defects of the prior art and provides a novel energy-saving environment-friendly closed ring type roasting furnace continuous production system and a process method which are reasonable in design, reduce heat loss and have good environment-friendly effect.
The technical scheme of the invention is as follows:
the utility model provides a novel energy-concerving and environment-protective airtight ring type roasting furnace continuous production system, includes a plurality of roasting furnace rooms that the interval set up, every roasting furnace room includes furnace body and bell, characterized by respectively: the bottom of the former roasting furnace chamber is communicated with the upper part of the latter roasting furnace chamber through a flue gas pipeline, a valve is arranged on the flue gas pipeline, and the like, so that all the roasting furnace chambers are connected in series;
the outside of the roasting furnace chambers is provided with a circulating gas pipeline and an exhaust gas pipeline, a circulating gas inlet, a circulating gas outlet and an exhaust gas inlet are correspondingly arranged on the circulating gas pipeline and the exhaust gas pipeline relative to each roasting furnace chamber, so that each roasting furnace chamber can be communicated with the circulating gas inlet or the circulating gas outlet through a circulating gas communication cover to realize air inlet or air outlet, each roasting furnace chamber can be communicated with the exhaust gas inlet through an exhaust gas communication cover, a circulating gas fan is arranged on the circulating gas pipeline, and an exhaust gas discharge fan is arranged on the exhaust gas pipeline;
the furnace body and the furnace cover of each roasting furnace chamber respectively adopt a steel structure, the bottom of the furnace body adopts refractory bricks as a supporting structure, the inner walls of the periphery of the furnace body adopt heat-insulating refractory fiber materials, the inner walls of the furnace cover also adopt heat-insulating refractory fiber materials, saggers are placed in the space of the furnace body at intervals, and products to be roasted are placed in the saggers;
each roasting furnace chamber is internally provided with an automatic air distribution burner, an air source of the automatic air distribution burner is communicated with a natural gas pipeline, each roasting furnace chamber is provided with a temperature sensor and an oxygen sensor, the temperature sensor is used for adjusting the flow of natural gas, and the oxygen sensor is used for adjusting the air distribution amount of the automatic air distribution combustion system to realize independent temperature rising control of each roasting furnace chamber;
each roasting furnace chamber is respectively subjected to operation procedures of furnace loading, heating, heat preservation, cooling, furnace discharging and preparation according to a starting and capping schedule sequence, continuous production is realized, during heating, hot flue gas generated by combustion runs downwards through a gap between the sagger, flows to the roasting furnace chamber produced in the next series after being collected through a bottom flue of the furnace chamber, sequentially reaches the last roasting furnace chamber in series, volatile matter-containing flue gas discharged from the roasting furnace chamber is covered on a circulating gas pipeline by a circulating gas communication cover, is discharged into a fire stopping heat preservation furnace chamber in front of the front-end high-temperature roasting furnace chamber through a circulating fan, and is discharged into a waste gas pipeline after being fully combusted through the heat preservation furnace chamber and the high-temperature roasting furnace chamber, and redundant high-temperature waste gas is pumped out by a waste gas discharge fan and discharged into the waste gas pipeline.
Further: an air preheater is arranged on an exhaust gas pipeline in front of the exhaust gas emission fan, the preheated air pressurizing fan is positioned at the front end of the air preheater and is used for conveying normal-temperature air to the air preheater through a pipeline, and the generated preheated air is communicated with the automatic air distribution combustion system through a preheated air pipeline to provide preheated air combustion supporting for the roasting furnace.
Further: an exhaust gas heat exchanger and a chimney are sequentially arranged on an exhaust gas pipeline behind the exhaust gas discharge fan, and the exhaust gas heat exchanger performs waste heat utilization on high-temperature exhaust gas;
the low-temperature waste gas outlet is arranged on the waste gas pipeline and is communicated with the roasting furnace chamber through the low-temperature waste gas conveying pipeline, the low-temperature waste gas conveying fan and the low-temperature waste gas control valve, and the roasting furnace chamber is matched with low-oxygen-content low-temperature waste gas to cool the furnace chamber with a higher process control temperature.
Further: a desulfurization device is arranged between the waste gas heat exchanger and the low-temperature waste gas outlet, and the sulfur device carries out desulfurization environmental protection treatment on sulfur in the flue gas and then empties the flue gas through a flue.
Further: the cylinder body of the sagger is made of a heat-resistant steel plate, a product to be roasted is placed in the sagger, a filler is filled between the product to be roasted and the wall of the sagger, and the filler is quartz sand, river sand or other materials.
The novel energy-saving environment-friendly closed ring type roasting furnace continuous production process method utilizing the novel energy-saving environment-friendly closed ring type roasting furnace continuous production system is characterized by comprising the following steps of:
a. and selecting the number of the roasting furnace chambers according to the production scale to form a closed production circulation system, and heating the roasting furnace chambers in the production circulation system. The closed production circulation system comprises a heat-preserving roasting furnace chamber, an ignition heating roasting furnace chamber, a hot flue gas circulation heating roasting furnace chamber and a closed roasting furnace chamber; the furnace chambers outside the closed production circulation system comprise a cooled roasting furnace chamber, a discharging roasting furnace chamber, a roasting furnace chamber for charging and a roasting furnace chamber for charging;
b. each roasting furnace chamber is respectively subjected to operation procedures of furnace loading, heating, heat preservation, cooling, furnace discharging and preparation according to the starting and capping time schedule sequence, and is dynamically pushed one by one to realize continuous cyclic production;
c. closing valves on front and back roasting furnace chambers of the closed ring type production circulation system, and enabling the raw closed production circulation roasting furnace chambers to form a closed space. After the high-temperature flue gas exhausted from the high-temperature furnace chamber enters the next furnace chamber through the valve to heat a product, the flue gas exhausted from the tail-end furnace chamber is sent to the front-end high-temperature furnace chamber through the circulating fan and the circulating gas communication cover to form a closed loop circulation, so that the production of each roasting furnace chamber according to a specified process temperature curve is realized;
d. the volatile matter-containing flue gas exhausted from the tail end furnace chamber is covered on the circulating gas pipeline by circulating gas communication, and is sent to a heat preservation furnace chamber before the fire stopping of the front end high-temperature roasting furnace chamber by the circulating fan, and after the heat preservation furnace chamber and the next high-temperature roasting furnace chamber are fully combusted, redundant high-temperature waste gas is pumped out by the waste gas exhaust fan and is discharged into the waste gas pipeline;
e. the roasting furnace chamber after roasting enters a heat preservation stage, a furnace cover is opened for cooling after heat preservation, a sagger is lifted out through a travelling crane after cooling, and then a furnace loading preparation program of the next circulation flow is entered.
The automatic air distribution combustion of natural gas is adopted in the heating roasting furnace, the heating roasting can be realized according to a specified roasting temperature rise curve, the amount of supplied fuel gas is determined according to temperature data detected by the roasting furnace chamber, the amount of air quantity equipped by the automatic air distribution combustor is determined according to oxygen content detection data of the roasting furnace chamber, and the equipped air is preheated air replaced by high-temperature exhaust gas.
Further: the primary roasting product of the roasting furnace adopts a heat-resistant steel cylinder sagger, a product to be roasted is arranged in the sagger, and quartz sand, river sand or other materials are added around and on the wall of the product to be roasted as filling materials so as to realize anaerobic heating roasting; the secondary roasting is performed under the condition that the oxygen content of the flue gas in the control furnace chamber is about 3 percent, or the impregnated product is filled in a sagger for roasting; the sagger can be loaded and unloaded by a general crane and can be operated at a fixed station.
Further: when the temperature of the roasting furnace chamber heated and raised is still higher than the specified requirement of the heating curve after cutting off the natural gas, the low-temperature low-oxygen-content waste gas is pumped by the low-temperature waste gas conveying fan and is sent into the furnace for cooling, so that the temperature of the furnace chamber meets the process requirement.
Further: and each roasting furnace chamber is provided with a pressure sensor, and the air quantity of the circulating fan and the air quantity of the waste gas discharge fan are adjusted according to the data information of the pressure sensor.
The beneficial effects of the invention are as follows:
1. all the roasting furnace chambers are connected in series to form continuous production, the low-temperature furnace chambers are heated by waste smoke of the high-temperature furnace chambers, and harmful smoke led out from the low-temperature furnace chambers at the tail ends of the series connection is discharged into the high-temperature furnace chambers at the front ends through the circulating fans to be burnt, so that the heat utilization rate is high, and harmful organic matters and carbon-containing particles in the smoke discharged from the burnt high-temperature furnace chambers are almost zero, so that the environment-friendly effect is good.
2. The invention has the advantages that each independent furnace chamber adopts a refractory brick structure except the furnace bottom flue gas channel and the bearing, the four sides and the furnace top of the furnace chamber structure adopt steel structures, and the built-in heat insulation refractory fiber can lead the external temperature to be less than 50 ℃, and the refractory fiber has the characteristics of light weight, low heat conductivity and low heat capacity, has very low heat storage capacity, can reduce heat loss by 5-6 times compared with the traditional ring type roasting kiln, and has good energy saving effect.
3. The furnace body of the roasting furnace has good tightness, and the oxygen content in the furnace can be controlled to be about 3.0% by adopting the automatic air distribution combustion-supporting combustion heating system of the preheated air, so that the volatile matters discharged from the raw products in the roasting process can not generate abnormal combustion in the furnace, and are discharged into the high-temperature furnace by the circulating fan to be burnt. The oxygen content in the discharged waste gas is far lower than the national regulation on the standard value of the ring roasting furnace discharge by 15 percent.
4. The invention uses a sagger for roasting, the raw product is firstly put into a steel cylinder with corresponding specification, and then the steel cylinder is put into a roasting furnace for roasting. The steel cylinder is made of heat-resistant steel plate, the inner diameter of the steel cylinder is slightly larger than the diameter of the raw product so that the raw product is filled with the filling material, and when quartz sand or river sand is used as the filling material for primary roasting, the filling material loss is the lowest, and the emission value is almost zero.
5. The invention adopts the sagger to roast the products, the height of the sagger is preferably 3000-4000 mm, so that the temperature in the furnace is relatively uniform, the temperature difference between the upper part and the lower part of the whole furnace can be controlled to be +/-30 ℃, the highest temperature of the novel closed ring type roasting is 850 ℃ (the temperature measured by flue gas), the actual temperature of the products can still reach more than 800 ℃, and the natural gas is saved.
6. Because the highest temperature in the furnace is set to 850 ℃, the energy consumption is reduced, the product quality is controllable, and NO X Reduced production conditions, NO emissions from the furnace X The concentration will be much lower than the national regulation of NO X Minimum emissionsAnd (5) standard.
7. The invention is not limited by the specification and the type of the product, can be used for primary roasting and secondary roasting, and has good economic and social benefits after popularization, and the secondary roasting time can be greatly shortened.
8. The invention cancels the multifunctional material sucking and discharging crown block, saves the cost of purchasing the multifunctional material sucking and discharging crown block and reduces the manufacturing cost of a roasting factory building.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a novel energy-saving environment-friendly closed ring type roasting furnace continuous production system;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a cross-sectional view B-B of FIG. 1;
FIG. 4 is a cross-sectional view of the sagger of FIG. 3;
FIG. 5 is a schematic diagram of a novel energy-saving environment-friendly closed ring type roasting furnace continuous production process method;
FIG. 6 is a schematic diagram of the control of the temperature of the heated roasting and the control of the oxygen content;
FIG. 7 is a schematic diagram of calcination volatile matter cycle combustion and exhaust emission;
fig. 8 is an enlarged view of fig. 1 at i.
The specific embodiment is as follows:
examples: referring to fig. 1-8, in the drawings,
1. exhaust gas communication hood, 2, natural gas pipeline, 3, circulating gas inlet pipe, 4, exhaust gas pipeline, 5, circulating gas outlet pipe, 6, circulating gas communication hood, 7, inlet box, 8, outlet pipe, 9, inlet pipe, 10, outlet box, 11, steel structure furnace body, 12, furnace cover, 13, furnace cover refractory fiber insulation material, 14, automatic air distribution burner fire outlet 15, inlet port, 16, temperature sensor, 17, sagger, 18, pressure sensor, 19, oxygen sensor, 20, refractory brick, 21, furnace body refractory fiber insulation material, 22, valve, 23, circulating gas fan, 24, roasting furnace, 25, automatic air distribution burner, 26, preheated air pipeline, 27, circulating fan controller, 28, chimney, 29, desulfurization device, 30, exhaust gas discharge fan controller, 31, exhaust gas heat exchanger, 32, exhaust gas discharge fan, low temperature exhaust gas delivery fan, 34, air preheater, 35, preheated air pressurization fan, 36, low temperature exhaust gas delivery pipeline, 37, to-be-roasted product 38, filler 39, circulating gas outlet port, 40, inlet port, 41, circulating gas inlet port
The utility model provides a novel energy-concerving and environment-protective airtight ring type roasting furnace continuous production circulation system, includes a plurality of roasting oven rooms 24 that the interval set up (in the figure, for 18 roasting oven rooms, of course can set up a plurality of roasting oven rooms and constitute a continuous production circulation system according to the production scale, not detailed one by one), and every roasting oven room 24 includes furnace body and bell 12 respectively, wherein: in each two adjacent roasting furnace chambers 24, the bottom of the former roasting furnace chamber 24 is communicated with the upper part of the latter roasting furnace chamber 24 through a flue gas pipeline, and a valve 22 is arranged on the flue gas pipeline, and the like, so that all the roasting furnace chambers 24 are connected in series.
The upper and lower parts of each roasting furnace chamber 24 are respectively provided with an air inlet box 7 and an air outlet box 10, one end of the air outlet box 10 is communicated with the lower part of the furnace body, the other end of the air outlet box 10 is communicated with the air inlet box 7 of the next roasting furnace chamber 24 through a flue gas pipeline, the air inlet box 7 is communicated with an air inlet pipe 9, the air inlet pipe 9 is provided with a plurality of air inlets 15, and the air inlets 15 pass through the furnace body. As can be seen from fig. 1: each air outlet box 7 is communicated with two air outlet pipes 9, and air outlets 15 of the two air outlet pipes 9 are arranged on two sides of the roasting furnace chamber 24.
The outside of each roasting furnace chamber 24 is respectively provided with a circulating gas pipeline and an exhaust gas pipeline 4, each roasting furnace chamber 24 is respectively provided with a circulating gas inlet 41, a circulating gas outlet 39 and an exhaust gas inlet 40 on the circulating gas pipeline and the exhaust gas pipeline 4, so that each roasting furnace chamber 24 can be communicated with the circulating gas inlet 41 or the circulating gas outlet 39 through a circulating gas communication cover 6 to realize air inlet or air outlet, each roasting furnace chamber 24 can be communicated with the exhaust gas inlet 40 through an exhaust gas communication cover 1, the circulating gas pipeline is provided with a circulating gas fan 23, and the exhaust gas pipeline 4 is provided with an exhaust gas discharge fan 32; each of the recycle gas inlet 41, the recycle gas outlet 39 and the exhaust gas inlet 40 is provided with a control valve, respectively, which can be turned on and off.
And (3) optimizing design: the circulating gas pipeline comprises a circulating gas inlet pipe 3 and a circulating gas outlet pipe 5, one ends of the circulating gas inlet pipe 3 and the circulating gas outlet pipe are respectively closed, the other ends of the circulating gas inlet pipe and the circulating gas outlet pipe are communicated through a circulating fan 23, as shown in fig. 5, flue gas enters the circulating gas outlet pipe 5 from a No. 14 heating roasting furnace chamber 24, and enters the No. 3 roasting furnace chamber 24 for heat preservation along the arrow direction. In fig. 5 and 6, the open valve symbols represent open and the solid valve symbols represent closed.
The furnace body and the furnace cover 12 of each roasting furnace chamber 24 respectively adopt a steel structure (wherein the number of the steel structure furnace body is 11), the bottom of the furnace body adopts refractory bricks 20 as a supporting structure, the inner walls of the periphery of the furnace body adopt heat-insulating refractory fiber materials 21, the inner walls of the furnace cover 12 adopt heat-insulating refractory fiber materials 13, sagger 17 are arranged in the furnace at intervals, and the sagger 17 is filled with products 37 to be roasted;
each roasting furnace chamber 24 is internally provided with an automatic air distribution burner 14 respectively, an air source of the automatic air distribution burner 14 is communicated with a natural gas pipeline 2, each roasting furnace chamber 24 is provided with a temperature sensor 16 and an oxygen sensor 19, the temperature sensor 16 is used for adjusting the flow of natural gas, and the oxygen sensor 19 is used for adjusting the air distribution quantity of the automatic air distribution burner 25 so as to realize independent temperature rise control of each roasting furnace chamber 24;
each roasting furnace chamber 24 is respectively operated according to the operation procedures of starting and capping time schedule, such as furnace loading, heating, heat preservation, cooling, furnace discharging and preparation, so as to realize continuous production, when heating, hot flue gas generated by combustion runs downwards through gaps between sagger 14, flows to the roasting furnace chamber 24 of the next series production after being collected through a bottom flue of a furnace body, sequentially reaches the last roasting furnace chamber 24 of the series production, volatile matter-containing flue gas discharged from the roasting furnace chamber 24 is connected to a circulating gas pipeline by a circulating gas communication cover 1, is discharged into a heat preservation furnace chamber before the front-end high-temperature roasting furnace chamber 24 stops fire by a circulating fan 23, and is discharged into a waste gas pipeline 4 by a waste gas discharge fan 32 after the heat preservation furnace chamber and the next high-temperature roasting furnace chamber 24 are fully combusted.
The preferable scheme is as follows: an air heater 34 is arranged on an exhaust gas pipeline in front of the exhaust gas discharge fan 32, and preheated air generated by the air heater 34 is communicated with the automatic air distribution burner 25 through a preheated air pipeline 26 and a preheated air pressurizing fan 35 to match low-oxygen-content low-temperature exhaust gas for the roasting furnace chamber 24.
The preferable scheme is as follows: an exhaust gas heat exchanger 31 (for further cooling), a desulfurization device 29 and a chimney 28 are sequentially arranged on the exhaust gas pipeline 4 behind the exhaust gas discharge fan 32, a low-temperature exhaust gas outlet is arranged on the exhaust gas pipeline 4 between the desulfurization device 29 and the chimney 28, and the low-temperature exhaust gas is communicated with the roasting furnace chamber 24 through a low-temperature exhaust gas conveying pipeline 36, a low-temperature exhaust gas conveying fan 33 and a low-temperature gas control valve to match low-oxygen-content low-temperature exhaust gas for the roasting furnace chamber 24 and cool the furnace chamber with a higher process control temperature.
The preferable scheme is as follows: through detection, if the sulfur content in the discharged exhaust gas exceeds the standard, a desulfurization device 29 is arranged between the exhaust gas heat exchanger 31 and the low-temperature exhaust gas outlet to reduce the sulfur content in the exhaust gas, and if the sulfur content of raw product raw materials is lower, the desulfurization device 29 can be omitted.
The preferable scheme is as follows: the cylinder of the sagger 17 is made of heat-resistant steel plates, a product 37 to be roasted is placed in the sagger, a filler 38 is filled between the product 37 to be roasted and the steel wall, and the filler 38 can be quartz sand or river sand.
In this example, UHP phi 600 x 3000mm graphite electrodes of 18 firing furnaces 24 are used as an example for one firing. The production system comprises a sagger loading and unloading system, a roasting and loading and unloading system, a heating and roasting temperature control and oxygen content control system and a roasting furnace volatile matter circulating combustion and waste gas discharge system.
Technical performance parameters: (production)One-time baking of graphite electrodes is an example
Parameter name Unit (B) Performance parameters
Type and specification of baked product Primary roasting/secondary roasting various specifications carbon products
Number of furnace chambers Personal (S) 18
Furnace cover of furnace chamber needing to be matched Personal (S) 15
Roasting furnace size is long-wide-high mm 14556*9092*7580
Furnace chamber internal dimensions long-wide-high mm 9200*6500*6480
Arch height of furnace cover mm 750
Distance between centers of adjacent roasting chambers mm 12600
Number of heating systems Strip 1
Closed heating furnace chamberNumber of digits Chamber 9-11
Heating temperature rise curve (one baking) h 360
Heating curve (two baking) h 168
Single furnace chamber green body loading Ton (ton) 110 (70 sagger for phi 600 products)
Baked goods capacity (10 months) Ton (ton) 20240
Electrode core temperature ℃ 800
Highest temperature of roasting flue gas ℃ 850
Natural gas/unit consumption m 3 Per ton of ＜60
Oxygen content ％ ＜3.6
The production system consists of 18 roasting furnace chambers 24, 9-12 furnace chambers for heating, 1-2 closed cooling furnace chambers with covers, at least 1 open cooling furnace chamber, 1 heat preservation furnace chamber, 1 closed low-temperature furnace chamber with covers and 1-2 furnace chambers for charging.
A novel energy-saving environment-friendly closed ring type roasting furnace continuous production process method utilizing a novel energy-saving environment-friendly closed ring type roasting furnace continuous production system comprises the following steps:
a. the number of the roasting furnace chambers 24 is selected according to the production scale to form a closed production circulation system, and the roasting furnace chambers 24 in the closed production circulation system are heated. The closed production circulation system comprises a heat-preserving roasting furnace chamber (a roasting furnace chamber No. 3 in the figure), an ignition heating roasting furnace chamber (a roasting furnace chamber No. 4 in the figure), a hot flue gas circulation heating roasting furnace chamber (roasting furnace chambers No. 5-14 in the figure) and a closed roasting furnace chamber (a roasting furnace chamber No. 15 in the figure); the furnace chambers outside the closed production system comprise a cooled roasting furnace chamber (No. 2 roasting furnace chamber in the figure), a discharged roasting furnace chamber (No. 1 roasting furnace chamber in the figure), a roasting furnace chamber for charging (No. 17 and No. 18 roasting furnace chambers in the figure) and a roasting furnace chamber for charging (No. 16 roasting furnace chamber in the figure);
b. each roasting furnace chamber 24 is respectively subjected to furnace loading, heating, heat preservation, cooling, furnace discharging and preparation operation procedures according to the starting and capping sequence, and is dynamically pushed one by one to realize continuous production;
c. and closing valves 22 on the pipelines of the front furnace chamber and the rear furnace chamber, which are communicated with the furnace chambers at the two ends of the first furnace chamber and the last furnace chamber of the closed production circulation system, and burning and heating natural gas in a high-temperature roasting furnace chamber 24 to enable the roasting furnace chamber to reach the process designated temperature. After the high-temperature flue gas exhausted from the high-temperature furnace chamber enters the next furnace chamber through the valve and heats the product, the flue gas exhausted from the tail-end furnace chamber is sent to the front-end high-temperature furnace chamber through the circulating fan 23 and the circulating gas communication cover 6 to form a closed loop circulation, so that the production of each roasting furnace chamber according to a specified process temperature curve is realized;
d. harmful organic smoke exhausted from the tail end roasting furnace chamber 24 (the 14 th roasting furnace chamber in the figure) is connected to a circulating gas pipeline through a circulating gas communication cover 6, is exhausted into a heat preservation furnace chamber (the 3 rd roasting furnace chamber in the figure) before the front end high-temperature roasting furnace stops firing through a circulating fan 23, is fully combusted through the heat preservation furnace chamber and the next high-temperature roasting furnace (namely the head end roasting furnace chamber, the 4 th roasting furnace chamber in the figure), and is exhausted into an exhaust pipeline through an exhaust gas exhaust fan after the surplus high-temperature exhaust gas is extracted;
e. the roasting furnace chamber 24 after roasting enters a heat preservation stage, a furnace cover is opened for cooling after heat preservation, the sagger 17 is lifted out by a crane after cooling, and then a furnace loading preparation program of the next circulation flow is entered.
Such as: when the baking furnace chamber No. 4 in the figure finishes baking and is converted into a heat-preserving state, the baking furnace chamber No. 15 enters a baking state from a closed state to form the first end and the tail end of a new round of heating, at the moment, the baking furnace chamber No. 16 for charging is converted into a closed state, the baking furnace chamber No. 17 is converted into a charging state from preparation, the baking furnace chamber No. 1 is converted into a preparation state from discharging, and the like, so as to form a continuous baking system.
The closed circulation production roasting system adopts a natural gas automatic air distribution burner to heat and raise the temperature, can realize production according to a specified roasting heating curve, determines the quantity of supplied fuel gas by temperature detection temperature data of the roasting furnace chamber 24, and determines the quantity of air equipped with the automatic burner by oxygen content data detected by the roasting furnace chamber 24, wherein the air equipped with the automatic burner is preheated air replaced by high-temperature exhaust gas.
The preferable scheme is as follows: the primary roasting product of the roasting furnace adopts a sagger 17 of a heat-resistant steel cylinder, a product to be roasted 37 is arranged in the sagger 17, quartz sand, river sand or other materials are added between the periphery of the product to be roasted 37 and the steel wall to serve as a filler 38, so that the anaerobic heating roasting is realized, the height of the filler at the bottom of the sagger 17 is about 200mm, and the thickness of the filler 39 needs to be covered at the upper part of a raw product to be 350-400 mm; the secondary roasting is performed under the condition of controlling the oxygen content to be about 3 percent, or the impregnation product is arranged in the sagger 17 for roasting; the roasting furnace chamber 24 is opened, capped and sagger loaded and unloaded by adopting a general lifting crane, and the sagger 17 can be used for loading and unloading products to a special loading and unloading station.
The preferable scheme is as follows: each roasting furnace chamber 24 is heated by a plurality of automatic air distribution burners 25, the used preheated air is supplied after the normal-temperature air is preheated by an air heater 34 arranged on a high-temperature waste gas pipeline 4, natural gas (or coal gas) is used for combustion, and if the temperature of the heated and warmed furnace chamber 24 is still higher than the specified requirement of a heating curve after the natural gas is cut off, low-temperature waste gas with low oxygen content can be extracted by a low-temperature waste gas conveying fan 33 and sent into the furnace for cooling.
The preferable scheme is as follows: each of the roasting oven chambers 24 is provided with a pressure sensor 18.
The pressure sensor detection data information of the high-temperature furnace chamber arranged behind the heat preservation furnace chamber at the head end of the closed circulation production roasting system is used for adjusting the air quantity of the exhaust emission fan 32 through the air quantity controller 30.
The pressure sensor detection data information arranged in the furnace chamber at the tail end of the closed circulation production roasting system is used for adjusting the air quantity of the exhaust emission fan 23 through the air quantity controller 27.
The invention adopts the sagger 17 for roasting, and has the following advantages:
1) The steel sagger heat transfer is fast, so that the temperature rise and the temperature difference reduction of the upper and lower parts and the periphery of the green products are relatively uniform, the temperature difference between the upper and lower parts is reduced by about 200 ℃ compared with the traditional ring furnace with the cover, and a relatively fast roasting temperature rise curve can be used without increasing crack waste products.
2) The raw product is baked in a sagger, and the actual heated temperature of the raw product can be improved by about 50 ℃ compared with that of the directly-charged furnace (a large amount of filling materials are arranged around the raw product) under the same flame temperature.
3) The upper part of the product in the steel sagger is covered with filling material with the thickness of more than 350 mm. And certain resistance is generated when the volatile matters are discharged, and the micro positive pressure is kept in the sagger, so that the carbon residue rate of the binder coal pitch is improved.
4) The steel sagger roasting can reduce the consumption of the filling material, and compared with the direct charging of the raw products, the unit consumption of the filling material can be reduced by about 1/3, and if quartz sand or river sand is adopted as the filling material, the consumption is lower.
5) The universal travelling crane is adopted for discharging the sagger during roasting, a high-cost multifunctional material sucking and discharging crown block is not required to be installed, the sagger discharging product is carried out at a special loading and unloading station, and a roasting workshop is clean and sanitary.
Compared with the highest temperature setting of the traditional ring type roasting furnace, the roasting of the sagger-contained product can be reduced from about 1200 ℃ to about 850 ℃ for roasting. The final temperature of the roasting is directly related to the energy consumption, and the energy consumption is necessarily increased when the final temperature of the roasting is increased, but the energy saving is considered on the premise of ensuring the quality of finished products in the subsequent process. Coking by using coal pitch as a binder is basically completed at 650-700 ℃, but the volume shrinkage of a baked product is still carried out when the coal pitch is heated to more than 700 ℃, the true density of the coke is further improved, the mechanical strength is increased, the electric conductivity and the thermal conductivity are further improved, and the volume shrinkage is basically stabilized after the coal pitch is heated to 800 ℃. In order to ensure the yield of the subsequent process, the highest temperature of primary roasting is not lower than 800 ℃ (the actual roasting heated temperature), and the roasted product can be smoothly subjected to heat treatment at a higher temperature in a graphitization furnace as long as the temperature is not lower than 800 ℃. The final temperature of the electrode raw product baked by the traditional ring-type baking furnace is generally 1200 ℃ (the actual temperature of the product arranged at the lower layer of the furnace chamber is only about 800 ℃), and the large difference of the final baking temperature of the raw product in the ring-type baking furnace causes large fluctuation of physical properties among baked products in the same furnace, which is one of the reasons that crack waste products are easy to generate in the graphitization process. If all the roasting products in the roasting furnace are roasted at the approximately same temperature, the difference of the physical and mechanical properties of the roasting products can be reduced only if the temperature difference between the upper, lower, left and right of the temperature field in the roasting furnace is controlled in a smaller range, and the relation between the final roasting temperature and the temperature field of the roasting furnace is very large.
The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification made according to the technical spirit of the present invention still falls within the scope of the present invention.

Claims (10)

1. The utility model provides a novel energy-concerving and environment-protective airtight ring type roasting furnace continuous production system, includes a plurality of roasting furnace rooms that the interval set up, every roasting furnace room includes furnace body and bell, characterized by respectively: the bottom of the former roasting furnace chamber is communicated with the upper part of the latter roasting furnace chamber through a flue gas pipeline, a valve is arranged on the flue gas pipeline, and the like, so that all the roasting furnace chambers are connected in series;
the outside of the roasting furnace chambers is provided with a circulating gas pipeline and an exhaust gas pipeline, a circulating gas inlet, a circulating gas outlet and an exhaust gas inlet are correspondingly arranged on the circulating gas pipeline and the exhaust gas pipeline relative to each roasting furnace chamber, so that each roasting furnace chamber can be communicated with the circulating gas inlet or the circulating gas outlet through a circulating gas communication cover to realize air inlet or air outlet, each roasting furnace chamber can be communicated with the exhaust gas inlet through an exhaust gas communication cover, a circulating gas fan is arranged on the circulating gas pipeline, and an exhaust gas discharge fan is arranged on the exhaust gas pipeline;
the furnace body and the furnace cover of each roasting furnace chamber respectively adopt a steel structure, the bottom of the furnace body adopts refractory bricks as a supporting structure, the inner walls of the periphery of the furnace body adopt heat-insulating refractory fiber materials, the inner walls of the furnace cover also adopt heat-insulating refractory fiber materials, saggers are placed in the space of the furnace body at intervals, and products to be roasted are placed in the saggers;
each roasting furnace chamber is internally provided with an automatic air distribution burner, an air source of the automatic air distribution burner is communicated with a natural gas pipeline, each roasting furnace chamber is provided with a temperature sensor and an oxygen sensor, the temperature sensor is used for adjusting the flow of natural gas, and the oxygen sensor is used for adjusting the air distribution amount of the automatic air distribution combustion system to realize independent temperature rising control of each roasting furnace chamber;
each roasting furnace chamber is respectively subjected to operation procedures of furnace loading, heating, heat preservation, cooling, furnace discharging and preparation according to a starting and capping schedule sequence, continuous production is realized, during heating, hot flue gas generated by combustion runs downwards through a gap between the sagger, flows to the roasting furnace chamber produced in the next series after being collected through a bottom flue of the furnace chamber, sequentially reaches the last roasting furnace chamber in series, volatile matter-containing flue gas discharged from the roasting furnace chamber is covered on a circulating gas pipeline by a circulating gas communication cover, is discharged into a fire stopping heat preservation furnace chamber in front of the front-end high-temperature roasting furnace chamber through a circulating fan, and is discharged into a waste gas pipeline after being fully combusted through the heat preservation furnace chamber and the high-temperature roasting furnace chamber, and redundant high-temperature waste gas is pumped out by a waste gas discharge fan and discharged into the waste gas pipeline.
2. The novel energy-saving environment-friendly closed ring type roasting furnace continuous production system as claimed in claim 1, wherein the energy-saving environment-friendly closed ring type roasting furnace continuous production system is characterized in that: an air preheater is arranged on an exhaust gas pipeline in front of the exhaust gas emission fan, the preheated air pressurizing fan is positioned at the front end of the air preheater and is used for conveying normal-temperature air to the air preheater through a pipeline, and the generated preheated air is communicated with the automatic air distribution combustion system through a preheated air pipeline to provide preheated air combustion supporting for the roasting furnace.
3. The novel energy-saving environment-friendly closed ring type roasting furnace continuous production system as claimed in claim 1, wherein the energy-saving environment-friendly closed ring type roasting furnace continuous production system is characterized in that: an exhaust gas heat exchanger and a chimney are sequentially arranged on an exhaust gas pipeline behind the exhaust gas discharge fan, and the exhaust gas heat exchanger performs waste heat utilization on high-temperature exhaust gas;
the low-temperature waste gas outlet is arranged on the waste gas pipeline and is communicated with the roasting furnace chamber through the low-temperature waste gas conveying pipeline, the low-temperature waste gas conveying fan and the low-temperature waste gas control valve, and the roasting furnace chamber is matched with low-oxygen-content low-temperature waste gas to cool the furnace chamber with a higher process control temperature.
4. The novel energy-saving environment-friendly closed ring type roasting furnace continuous production system according to claim 3, which is characterized in that: a desulfurization device is arranged between the waste gas heat exchanger and the low-temperature waste gas outlet, and the sulfur device carries out desulfurization environmental protection treatment on sulfur in the flue gas and then empties the flue gas through a flue.
5. The novel energy-saving environment-friendly closed ring type roasting furnace continuous production system as claimed in claim 1, wherein the energy-saving environment-friendly closed ring type roasting furnace continuous production system is characterized in that: the cylinder body of the sagger is made of a heat-resistant steel plate, a product to be roasted is placed in the sagger, a filler is filled between the product to be roasted and the wall of the sagger, and the filler is quartz sand, river sand or other materials.
6. The novel energy-saving environment-friendly closed ring type roasting furnace continuous production process method utilizing the novel energy-saving environment-friendly closed ring type roasting furnace continuous production system of any one of 1-5 is characterized by comprising the following steps:
a. and selecting the number of the roasting furnace chambers according to the production scale to form a closed production circulation system, and heating the roasting furnace chambers in the production circulation system. The closed production circulation system comprises a heat-preserving roasting furnace chamber, an ignition heating roasting furnace chamber, a hot flue gas circulation heating roasting furnace chamber and a closed roasting furnace chamber; the furnace chambers outside the closed production circulation system comprise a cooled roasting furnace chamber, a discharging roasting furnace chamber, a roasting furnace chamber for charging and a roasting furnace chamber for charging;
b. each roasting furnace chamber is respectively subjected to operation procedures of furnace loading, heating, heat preservation, cooling, furnace discharging and preparation according to the starting and capping time schedule sequence, and is dynamically pushed one by one to realize continuous cyclic production;
c. closing valves on front and back roasting furnace chambers of the closed ring type production circulation system, and enabling the raw closed production circulation roasting furnace chambers to form a closed space. After the high-temperature flue gas exhausted from the high-temperature furnace chamber enters the next furnace chamber through the valve to heat a product, the flue gas exhausted from the tail-end furnace chamber is sent to the front-end high-temperature furnace chamber through the circulating fan and the circulating gas communication cover to form a closed loop circulation, so that the production of each roasting furnace chamber according to a specified process temperature curve is realized;
d. the volatile matter-containing flue gas exhausted from the tail end furnace chamber is covered on the circulating gas pipeline by circulating gas communication, and is sent to a heat preservation furnace chamber before the fire stopping of the front end high-temperature roasting furnace chamber by the circulating fan, and after the heat preservation furnace chamber and the next high-temperature roasting furnace chamber are fully combusted, redundant high-temperature waste gas is pumped out by the waste gas exhaust fan and is discharged into the waste gas pipeline;
e. the roasting furnace chamber after roasting enters a heat preservation stage, a furnace cover is opened for cooling after heat preservation, a sagger is lifted out through a travelling crane after cooling, and then a furnace loading preparation program of the next circulation flow is entered.
7. The continuous production process of the novel energy-saving environment-friendly closed ring type roasting furnace as claimed in claim 6, wherein the heating roasting furnace adopts natural gas to automatically perform air distribution combustion, heating roasting can be realized according to a specified roasting heating curve, the amount of supplied fuel gas is determined by temperature data detected by the roasting furnace chamber, the amount of air quantity provided by the automatic air distribution burner is determined by oxygen content detection data of the roasting furnace chamber, and the provided air is preheated air replaced by high-temperature discharged waste gas.
8. The novel energy-saving environment-friendly closed ring type roasting furnace continuous production process method as claimed in claim 6, which is characterized by comprising the following steps: the primary roasting product of the roasting furnace adopts a heat-resistant steel cylinder sagger, a product to be roasted is arranged in the sagger, and quartz sand, river sand or other materials are added around and on the wall of the product to be roasted as filling materials so as to realize anaerobic heating roasting; the secondary roasting is performed under the condition that the oxygen content of the flue gas in the control furnace chamber is about 3 percent, or the impregnated product is filled in a sagger for roasting; the sagger can be loaded and unloaded by a general crane and can be operated at a fixed station.
9. The novel energy-saving environment-friendly closed ring type roasting furnace continuous production process method as claimed in claim 6, which is characterized by comprising the following steps: when the temperature of the roasting furnace chamber heated and raised is still higher than the specified requirement of the heating curve after cutting off the natural gas, the low-temperature low-oxygen-content waste gas is pumped by the low-temperature waste gas conveying fan and is sent into the furnace for cooling, so that the temperature of the furnace chamber meets the process requirement.
10. The novel energy-saving environment-friendly closed ring type roasting furnace continuous production process method as claimed in claim 6, which is characterized by comprising the following steps: and each roasting furnace chamber is provided with a pressure sensor, and the air quantity of the circulating fan and the air quantity of the waste gas discharge fan are adjusted according to the data information of the pressure sensor.
CN202311522572.1A 2023-11-15 2023-11-15 Novel energy-saving environment-friendly closed ring type roasting furnace continuous production system and process method Pending CN117537604A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN121673056A (en) * 2026-02-05 2026-03-17 内蒙古国丰新材料有限公司 A method for impregnating graphite electrodes by secondary calcination

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN121673056A (en) * 2026-02-05 2026-03-17 内蒙古国丰新材料有限公司 A method for impregnating graphite electrodes by secondary calcination
CN121673056B (en) * 2026-02-05 2026-04-14 内蒙古国丰新材料有限公司 A method for impregnating graphite electrodes by secondary calcination

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