CN111473655A - Belt type roasting machine process air circulation system - Google Patents
Belt type roasting machine process air circulation system Download PDFInfo
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- CN111473655A CN111473655A CN202010295897.0A CN202010295897A CN111473655A CN 111473655 A CN111473655 A CN 111473655A CN 202010295897 A CN202010295897 A CN 202010295897A CN 111473655 A CN111473655 A CN 111473655A
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- fan
- flue gas
- flue
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- 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
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- 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
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
- F27D17/002—Details of the installations, e.g. fume conduits or seals
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- 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
- F27D19/00—Arrangements of controlling devices
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- 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
- F27D19/00—Arrangements of controlling devices
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
- F27D2019/0018—Monitoring the temperature of the atmosphere of the kiln
- F27D2019/0021—Monitoring the temperature of the exhaust gases
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- 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
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0031—Regulation through control of the flow of the exhaust gases
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a belt type roasting machine process air circulating system which comprises a first fan and a second fan, wherein the first fan and the second fan are used for leading flue gas to be desulfurized and denitrated; be equipped with the temperature sensor who is used for detecting the flue gas temperature in the preceding flue of desulfurizing tower, still including connecting in second fan and temperature sensor's controller respectively, when the temperature of flue gas is greater than first predetermined temperature in the preceding flue of desulfurizing tower, controller control second fan increases the rotational speed. Through increasing the second fan, introduce the low temperature flue gas that the desulfurizing tower flows into the high temperature flue gas that does not get into the desulfurizing tower to reduce the high temperature flue gas that does not get into the desulfurizing tower, can guarantee the cooling effect of flue gas when not increasing belt roasting machine flue gas oxygen content, and can reduce follow-up flue gas and handle the load of system, reduction in production cost.
Description
Technical Field
The invention relates to the technical field of desulfurization and denitrification, in particular to a belt type roasting machine process air circulation system.
Background
In a document of 'opinion on ultra-low emission in the steel industry about propulsion implementation' issued by the country in 2019, the reference oxygen content of the flue gas of the grate rotary kiln and the belt type roasting machine reaching the index is regulated to be 18%.
The air system of the belt type roasting machine is a relatively complex sealed circulation system, the content of particulate matters, sulfur dioxide and nitrogen oxides in the flue gas led out by the main induced draft fan is relatively high, the flue gas can be discharged into the atmosphere after further purification, but the temperature of the flue gas led out by the main induced draft fan is usually 100 plus 180 ℃, the temperature can exceed 200 ℃ under extreme conditions, and during design, in order to ensure the normal operation of process equipment, a plurality of bypass systems controlled by valves need to be arranged on a flue so as to cool the flue gas led out by the main induced draft fan.
In the prior art, the flue gas is cooled mainly by introducing cold air into a flue gas pipeline, but because the cold air contains a large amount of oxygen, the cold air also brings a large amount of oxygen when regulating and controlling the flue gas temperature, the oxygen content of the flue gas subjected to desulfurization and denitrification exceeds a reference oxygen content value. The oxygen content of the desulfurized and denitrified fume after temperature adjustment is increased by 0.6-1.5 percent, the higher the temperature of the fume to be reduced is, the higher the increased oxygen content is, the oxygen content of the fume exceeds the reference oxygen content specified by environmental protection, meanwhile, the load of a subsequent fume dedusting, desulfurization and denitration system is increased, and the operation and equipment maintenance cost is increased.
Therefore, how to solve the problem that the oxygen content of the flue gas exceeds the environmental standard oxygen content and the burden of the subsequent treatment process is large is a problem to be solved urgently by the technical personnel in the field at present.
Disclosure of Invention
In view of the above, the present invention provides a process air circulation system for a belt type roasting machine, which can ensure the cooling effect of flue gas without increasing the oxygen content of the flue gas of the belt type roasting machine, and can reduce the load of a subsequent flue gas treatment system and reduce the production cost.
In order to achieve the above purpose, the invention provides the following technical scheme:
a belt type roasting machine process air circulating system comprises a first fan, a desulfurization tower, a flue gas dedusting and condensing system and a second fan, wherein the first fan is used for leading out flue gas to be desulfurized and denitrated, the desulfurization tower is connected to the first fan and is used for carrying out desulfurization process on the flue gas led out by the first fan, the flue gas dedusting and condensing system is connected to the desulfurization tower and is used for carrying out flue gas dedusting and condensing on the desulfurized flue gas, an air inlet of the second fan is communicated with a rear flue of the desulfurization tower or a rear flue of the flue gas dedusting and condensing system, and an air outlet of the second fan is communicated with a front flue of the first fan or the rear flue of the first fan;
be equipped with the temperature sensor who is used for detecting the flue gas temperature in the preceding flue of desulfurizing tower, still including connect respectively in the second fan with temperature sensor's controller, when the temperature of flue gas is greater than first predetermined temperature in the preceding flue of desulfurizing tower, controller control the second fan improves the rotational speed.
Preferably, the controller is provided with a second preset temperature, the second preset temperature is lower than the first preset temperature, and when the flue gas temperature in the front flue of the desulfurizing tower is lower than the second preset temperature, the controller controls the second fan to reduce the rotating speed.
Preferably, the second fan is a variable-frequency speed-regulating fan.
Preferably, the air inlet of the second fan is communicated with the rear flue of the flue gas dedusting and condensing system.
Preferably, the air outlet of the second fan is communicated with the front flue of the first fan.
Preferably, the front flue of the first fan is further connected with a cold air system for conveying cold air to the front flue of the first fan through a control valve, the control valve is in signal connection with the controller, and when the rotating speed of the second fan reaches the maximum rotating speed and the temperature of flue gas in the front flue of the desulfurizing tower is higher than a first preset temperature, the controller controls the control valve to be opened, so that the cold air system conveys cold air to the front flue of the first fan.
Preferably, the control valve comprises a main valve 0 arranged on a main pipeline of the cold air system and an auxiliary valve arranged on a branch pipeline connected with a front flue of the first fan.
Preferably, the control valve is a solenoid valve.
According to the belt type roasting machine process air circulation system provided by the invention, the second fan is additionally arranged, the air inlet of the second branch machine is communicated with the rear flue of the desulfurizing tower, the air outlet of the second branch machine is communicated with the front flue of the first fan or the rear flue of the first branch machine, so that low-temperature flue gas flowing out of the desulfurizing tower is introduced into high-temperature flue gas which does not enter the desulfurizing tower through the second fan, the high-temperature flue gas which does not enter the desulfurizing tower is reduced, and the temperature of the flue gas entering the desulfurizing tower meets the process requirements.
Meanwhile, a temperature sensor is arranged in the front flue of the desulfurizing tower to monitor whether the temperature of the flue gas in the front flue of the desulfurizing tower meets the requirement of a follow-up process flow in real time, the rotating speed of the second fan is automatically controlled through a controller, and when the temperature of the flue gas in the front flue of the desulfurizing tower is higher than a first preset temperature, the controller controls the second fan to increase the rotating speed so as to reduce the temperature of the flue gas which does not enter the desulfurizing tower, and the temperature of the neutralized flue gas meets the requirement of the follow-up process. And because the invention cools the high-temperature flue gas which is not desulfurized through the low-temperature flue gas after desulfurization, so the cold air with higher oxygen content does not need to be injected into the flue gas, thereby the oxygen content of the flue gas of the travelling grate can be obviously reduced, the flue gas meets the national emission requirement, the load of a subsequent flue gas treatment system is reduced, and the production cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic view of an embodiment of a belt type roasting machine process air circulation system provided by the present invention.
The system comprises a first fan, a second fan, a desulfurization tower, a flue gas dedusting and condensing system, a denitration system, a cooling air system, a third fan, a flue gas 8, a flue gas bittern 9, an auxiliary valve 10, a main valve 11 and a control valve 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a belt type roasting machine process air circulating system, which can ensure the cooling effect of flue gas without increasing the oxygen content of the flue gas of the belt type roasting machine, can reduce the load of a subsequent flue gas treatment system and reduce the production cost.
Referring to fig. 1, fig. 1 is a schematic view of an embodiment of a belt type baking machine process air circulation system provided in the present invention.
The invention provides a belt type roasting machine process air circulating system which comprises a first fan 1 used for leading out flue gas to be desulfurized and denitrated, a desulfurizing tower 3 connected with the first fan 1 and used for carrying out a desulfurization process on the flue gas led out by the first fan 1, a flue gas dedusting and condensing system 4 connected with the desulfurizing tower 3 and used for carrying out flue gas dedusting and condensing on the desulfurized flue gas, and the belt type roasting machine process air circulating system also comprises a second fan 2, wherein the air inlet of the second fan 2 is communicated with the rear flue of the desulfurizing tower 3 or the rear flue of the flue gas dedusting and condensing system 4, and the air outlet of the second fan 2 is communicated with the front flue of the first fan 1 or the rear flue of the first fan 1;
be equipped with the temperature sensor who is used for detecting the flue gas temperature in the preceding flue of desulfurizing tower 3, still including connecting in second fan 2 and temperature sensor's controller respectively, when the temperature of flue gas is greater than first predetermined temperature in the preceding flue of desulfurizing tower 3, controller control second fan 2 increases the rotational speed.
As shown in fig. 1, the flue gas to be desulfurized and denitrated is led out from a first fan 1 and enters a desulfurizing tower 3, the desulfurizing tower 3 is used for carrying out a desulfurization process on the flue gas led out from the first fan 1, the desulfurized flue gas enters a flue gas dedusting and condensing system 4 for dedusting and further cooling, the flue gas after dedusting and further cooling enters a denitration system 5 for carrying out a denitration process, and the flue gas after the denitration process is led out to flue gas brine 8 through a third fan 7 and is discharged to the atmosphere.
The air inlet of the second fan 2 is communicated with the desulfurized rear flue or the rear flue of the flue gas dedusting and condensing system 4, the air outlet of the second fan 2 is communicated with the front flue of the first fan 1 or the rear flue of the first fan 1, so that part of the flue gas discharged from the desulfurizing tower 3 or the smoke dust removing and cooling system is sent to the front flue or the rear flue of the first fan 1 again, namely, the flue gas which does not enter the desulfurizing tower 3 is sent again so as to cool the flue gas which does not enter the desulfurizing tower 3, because the temperature of the flue gas after desulfurization is 40-60 ℃, the temperature of the flue gas which does not enter the desulfurization tower 3 is about 100-, therefore, the low-temperature flue gas discharged by the desulfurizing tower 3 or the smoke dust removing and cooling system can cool the flue gas which does not enter the desulfurizing tower 3, so as to ensure that the temperature of the flue gas entering the desulfurizing tower 3 meets the process requirements.
Still be equipped with the temperature sensor who is used for detecting flue gas temperature on the preceding flue of desulfurizing tower 3, still include the controller, temperature sensor is used for detecting the flue gas temperature in the preceding flue of desulfurizing tower 3, so that the controller judges whether the temperature of the flue gas in the preceding flue of desulfurizing tower 3 satisfies the technological production requirement of follow-up SOx/NOx control, the controller respectively with temperature sensor and 2 control connections of second fan, so that the rotational speed of second fan 2 through controller automatic adjustment, thereby adjust the amount of wind of taking out from second fan 2, the control is to the range of regulation of the temperature of the flue gas that does not get into desulfurizing tower 3.
Specifically, a first preset temperature, which is the flue gas temperature meeting the process production requirements of the subsequent desulfurization and denitrification, can be stored in the controller as required, the controller is used for receiving the flue gas temperature in the front flue of the desulfurization tower 3 detected by the temperature sensor, so as to compare with the first preset temperature, when the temperature of the flue gas in the front flue of the desulfurizing tower 3 is higher than the first preset temperature, the temperature of the flue gas in the front flue of the desulfurizing tower 3 does not meet the requirements of the subsequent process flow, the controller controls the second fan 2 to increase the rotating speed, the adjustment range of the temperature of the flue gas which does not enter the desulfurizing tower 3 is increased until the temperature of the flue gas in the front flue of the desulfurizing tower 3 is lower than a first preset temperature, so that the temperature of the neutralized desulfurization and denitrification flue gas meets the subsequent process production requirements, and the automatic adjustment of the temperature of the flue gas which does not enter the desulfurizing tower 3 is realized.
In summary, according to the belt-type roasting machine process air circulation system provided by the present invention, the second fan 2 is added, the air inlet of the second fan 2 is communicated with the rear flue of the desulfurizing tower 3, and the air outlet of the second fan 2 is communicated with the front flue of the first fan 1 or the rear flue of the first fan 1, so that the low-temperature flue gas flowing out of the desulfurizing tower 3 is introduced into the high-temperature flue gas which does not enter the desulfurizing tower 3 through the second fan 2, thereby reducing the high-temperature flue gas which does not enter the desulfurizing tower 3, and enabling the temperature of the flue gas entering the desulfurizing tower 3 to meet the process requirements.
Meanwhile, a temperature sensor is arranged in the front flue of the desulfurizing tower 3, so that whether the temperature of the flue gas in the front flue of the desulfurizing tower 3 meets the requirement of a follow-up process flow is monitored in real time, the rotating speed of the second fan 2 is automatically controlled through a controller, and when the temperature of the flue gas in the front flue of the desulfurizing tower 3 is higher than a first preset temperature, the controller controls the second fan 2 to increase the rotating speed, so that the temperature of the flue gas which does not enter the desulfurizing tower 3 is reduced, and the temperature of the neutralized flue gas meets the requirement of the follow-up process. And because the invention cools the high-temperature flue gas which is not desulfurized through the low-temperature flue gas after desulfurization, so the cold air with higher oxygen content does not need to be injected into the flue gas, thereby the oxygen content of the flue gas of the travelling grate can be obviously reduced, the flue gas meets the national emission requirement, the load of a subsequent flue gas treatment system is reduced, and the production cost is reduced.
On the basis of the above embodiment, considering that if the temperature of the flue gas detected by the temperature sensor is too low relative to the first preset temperature, it indicates that the rotation speed of the second fan 2 is too high, thereby causing energy waste, as an optimization, the controller is provided with a second preset temperature, the second preset temperature is less than the first preset temperature, and when the temperature of the flue gas in the front flue of the desulfurizing tower 3 is less than the second preset temperature, the controller controls the second fan 2 to reduce the rotation speed. Thereby with the temperature control of the flue gas of the front flue of desulfurizing tower 3 between first preset temperature and the second preset temperature, avoid the temperature of flue gas too high or low excessively, so, can enough make the temperature of flue gas satisfy the demand of follow-up production technology flow, can avoid the flue gas temperature to hang down the too big problem of energy consumption that causes second fan 2 again.
On the basis of the above embodiment, in consideration of the specific selection of the second fan 2, it is preferable that the second fan 2 is a variable-frequency variable-speed fan. So as to ensure the sensitivity of the controller to the adjustment of the rotational speed of the second fan 2.
On the basis of the above embodiment, in consideration of the specific arrangement manner of the air inlet and the air outlet of the second fan 2, as an optimal choice, the air inlet of the second fan 2 is communicated with the rear flue of the flue gas dust removal and condensation system 4. Because the temperature of the flue gas treated by the flue gas dedusting and condensing system 4 is lower, so that the flue gas treated by the flue gas dedusting and condensing system 4 and having a lower temperature is introduced into the flue before the desulfurizing tower 3, and the high-temperature flue gas which does not enter the desulfurizing tower 3 is cooled, and the efficiency of cooling the high-temperature flue gas is further improved, on the basis of the above embodiment, as an optimal choice, the air outlet of the second fan 2 is communicated with the front flue of the first fan 1.
On the basis of any of the above embodiments, considering that the rotation speed of the second fan 2 has the highest value, when the temperature of the flue gas is too high to exceed the cooling capacity of the second fan 2, an emergency cooling measure needs to be set, as an optimal choice, the front flue of the first fan 1 is further connected with a cold air system 6 for conveying cold air to the front flue of the first fan 1 through a control valve 11, the control valve 11 is in signal connection with the controller, and when the rotation speed of the second fan 2 reaches the maximum rotation speed and the temperature of the flue gas in the front flue of the desulfurizing tower 3 is greater than a first preset temperature, the controller controls the control valve 11 to be opened, so that the cold air system 6 conveys the cold air to the front flue of the first fan 1.
In this embodiment, in order to guarantee the safety of the process equipment, the cold air system 6 is started to adjust only when the second fan 2 cannot reach the smoke temperature to be controlled, so as to quickly adjust the smoke temperature and guarantee that the temperature of the smoke meets the requirements of the subsequent production process.
On the basis of the above-described embodiment, it is preferable that the control valve 11 includes a main valve 10 provided on the main duct of the cold air system 6 and a sub-valve 9 provided on the branch duct connected to the front flue of the first fan 1. As shown in fig. 1, the control valve 11 may include a main valve 10 and an auxiliary valve 9, the auxiliary valve 9 is disposed in a branch duct connected to a front flue of the first fan 1, and the main valve 10 is disposed on a main duct of the cold air system 6, so that the safety is improved by double safety control of the double valve. On the basis of the above embodiment, in view of the specific selection of the control valve 11, it is preferable that the control valve 11 is a solenoid valve.
The belt roasting machine which is put into production at present can be implemented according to the following steps:
selecting a proper variable frequency speed regulation fan and matched equipment according to the actual flue gas volume, the flue gas temperature and the maximum quantity of heat exchange required, and installing a flue external pipeline, a fan and related equipment facilities on site in advance; compiling a new smoke control system program, namely a controller, calculating corresponding speed regulation frequency of a corresponding variable-frequency speed regulation fan according to different heat exchange quantity and theories, preparing a corresponding monitoring device and a corresponding control device, and finishing laying of cables such as detection and control signals in advance;
disconnecting the flue at a preset flue position by using the maintenance time of the roasting machine for 1-3 days, completing the junction of the low-temperature wet flue gas access, recovering the flue seal, and installing corresponding detection and control facilities; all equipment facilities of the original flue gas temperature regulation and control system are reserved; after the maintenance is finished and normal production is carried out, a new flue gas temperature regulation and control system is started, the original flue gas temperature regulation and control system is closed, the flue gas temperature is regulated according to the mode of combining manual control and automatic control, then the parameter setting of the flue gas temperature regulation and control system is gradually perfected by combining manual regulation experience and system self-learning, and finally the flue gas temperature is regulated and controlled automatically.
For the newly-built travelling grate, according to the design of flue gas volume, flue gas temperature and maximum heat exchange quantity, a proper variable-frequency speed regulation fan and matched equipment are designed and selected, a flue gas temperature automatic operation control system is designed, and equipment installation is completed according to requirements during field construction. After the flue gas temperature regulation system is put into operation, the flue gas temperature is regulated according to a mode of combining manual control and automatic control, then the parameter setting of the flue gas temperature regulation system is gradually perfected by combining manual regulation experience and system self-learning, and finally the flue gas temperature is regulated and controlled automatically.
The process air circulating system of the belt type roasting machine provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. The technical air circulating system of the belt type roasting machine is characterized by comprising a first fan (1) for leading out flue gas to be desulfurized and denitrated, a desulfurizing tower (3) connected to the first fan (1) and used for carrying out a desulfurization process on the flue gas led out by the first fan (1), a flue gas dedusting and condensing system (4) connected to the desulfurizing tower (3) and used for carrying out flue gas dedusting and condensing on the desulfurized flue gas, and the technical air circulating system further comprises a second fan (2), wherein an air inlet of the second fan (2) is communicated with a rear flue of the desulfurizing tower (3) or a rear flue of the flue gas dedusting and condensing system (4), and an air outlet of the second fan (2) is communicated with a front flue of the first fan (1) or a rear flue of the first fan (1);
be equipped with the temperature sensor who is used for detecting the flue gas temperature in the preceding flue of desulfurizing tower (3), still including connect respectively in second fan (2) with temperature sensor's controller works as when the temperature of flue gas is greater than first predetermined temperature in the preceding flue of desulfurizing tower (3), controller control second fan (2) increase of rotation speed.
2. The band roasting machine process air circulation system of claim 1, wherein the controller is provided with a second preset temperature, the second preset temperature is lower than the first preset temperature, and when the temperature of the flue gas in the front flue of the desulfurizing tower (3) is lower than the second preset temperature, the controller controls the second fan (2) to reduce the rotating speed.
3. The belt roaster process air circulation system of claim 2, wherein the second fan (2) is a variable frequency speed fan.
4. The belt type roasting machine process air circulation system of claim 3, wherein the air inlet of the second fan (2) is communicated with the back flue of the flue gas dedusting and condensing system (4).
5. The belt type roasting machine process air circulation system of claim 4, wherein the air outlet of the second fan (2) is communicated with the front flue of the first fan (1).
6. The belt type roasting machine process air circulation system according to any one of claims 1 to 5, characterized in that a cold air system (6) for conveying cold air to the front flue of the first fan (1) is further connected to the front flue of the first fan (1) through a control valve (11), the control valve (11) is in signal connection with the controller, and when the rotating speed of the second fan (2) reaches the maximum rotating speed and the temperature of the flue gas in the front flue of the desulfurizing tower (3) is still greater than a first preset temperature, the controller controls the control valve (11) to be opened so that the cold air system (6) conveys cold air to the front flue of the first fan (1).
7. The belt roaster process air circulation system of claim 6, wherein the control valve (11) comprises a main valve (10) provided to a main duct of the cold air system (6) and a sub valve (9) provided to a branch duct connected to a front flue of the first fan (1).
8. The band roasting machine process air circulation system of claim 7, wherein the control valve (11) is a solenoid valve.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112375902A (en) * | 2021-01-07 | 2021-02-19 | 福建三钢闽光股份有限公司 | Experimental system for simulating pelletizing belt type roasting machine and using method thereof |
| CN116147361A (en) * | 2023-01-03 | 2023-05-23 | 湖南省长宁炭素股份有限公司 | Intelligent roasting system and control method thereof |
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Application publication date: 20200731 |