CN116465207A - Sintering waste heat utilization system and method with constant temperature and variable air quantity - Google Patents
Sintering waste heat utilization system and method with constant temperature and variable air quantity Download PDFInfo
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- CN116465207A CN116465207A CN202210024725.9A CN202210024725A CN116465207A CN 116465207 A CN116465207 A CN 116465207A CN 202210024725 A CN202210024725 A CN 202210024725A CN 116465207 A CN116465207 A CN 116465207A
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- flue gas
- air
- waste heat
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- 239000002918 waste heat Substances 0.000 title claims abstract description 92
- 238000005245 sintering Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 124
- 239000003546 flue gas Substances 0.000 claims abstract description 124
- 238000011084 recovery Methods 0.000 claims abstract description 26
- 230000001105 regulatory effect Effects 0.000 claims description 100
- 239000000779 smoke Substances 0.000 claims description 42
- 230000000740 bleeding effect Effects 0.000 claims description 21
- 238000004891 communication Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 239000003517 fume Substances 0.000 abstract description 17
- 230000008901 benefit Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Classifications
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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
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
- F27D15/0206—Cooling with means to convey the charge
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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
- F27D17/004—Systems for reclaiming waste heat
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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
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chimneys And Flues (AREA)
- Air Supply (AREA)
Abstract
The invention relates to a sintering waste heat utilization system and a method with constant temperature and variable air volume, comprising a circular cooler, a circular cooler fume collecting hood, an air box and a fume circulation system; the flue gas circulation system comprises an air taking pipeline, a waste heat boiler, a circulating fan connected with the waste heat boiler, a circular cooler return air main pipeline, a return air main branch pipeline, a blower and an automatic control system, and is characterized in that the circular cooler fume collecting hood is a through fume collecting hood, a high-temperature flue gas recovery system, a medium-temperature flue gas recovery system and a temperature mixing system are arranged on the upper portion of the through circular cooler fume collecting hood, high-temperature flue gas and medium-temperature flue gas in the circular cooler fume collecting hood are introduced into the circular cooler waste heat boiler, hot air after heat exchange of the circular cooler waste heat boiler is pressurized by the circulating fan, returns to the lower portion of the circular cooler bellows through the circular cooler return air main pipeline and the return air main branch pipeline, cools sinter when flowing through the circular cooler trolley from bottom to top, and heats up to form hot air and then sends the hot air to the circular cooler waste heat boiler, so that the circular utilization is achieved.
Description
Technical Field
The invention relates to the technical field of sintering waste heat utilization, in particular to a constant-temperature variable-air-quantity sintering waste heat utilization system and method.
Background
At present, with the progress of technology, the full-sealing ring cooler is widely applied to various projects, and the waste heat utilization of the full-sealing ring cooler is changed from the original utilization of only one-section and two-section high-temperature flue gas to the multipurpose utilization mode. The residual heat flue gas utilization of the upper cover part of the full-sealing ring cooler mainly comprises the following aspects: 1. the second section of higher temperature flue gas is used for introducing the waste heat boiler of the circular cooler to produce steam for power generation, the third section of flue gas is used for hot air sintering or producing hot water of the third section of hot water furnace, the fourth section of flue gas and the fifth section of flue gas are used for preheating cold air, and a baffle is arranged between the upper covers of the circular cooler so as to separate the flue gas with each section of application. The part with the highest temperature is introduced into the waste heat boiler to generate steam and generate electricity, so that the part with the most obvious economic benefit is obtained, and the sintering waste heat power generation effect is also an important index for checking the waste heat utilization efficiency.
In the current engineering design, the waste heat utilization air taking mostly adopts a fixed air quantity and temperature changing mode, namely, a partition plate for an upper cover of the annular cooler is segmented, the air quantity in the partition plate is relatively stable, and the flue gas temperature depends on the sintering exhaust flue gas temperature. Under the unstable condition of production condition, temperature variation is great, and boiler operation stability is not high, and what's more, because the sinter temperature is higher, lead to the flue gas temperature too high, the overtemperature is serious, and the boiler flue material selection can not satisfy the overtemperature requirement, and the deformation is serious, and rectification and maintenance are very difficult. The stable operation of the waste heat boiler is maintained, the waste heat power generation effect is further guaranteed, the waste heat utilization of the annular cooler is the core problem, and a sintering waste heat utilization system with constant temperature and variable air quantity is designed according to the problem.
Disclosure of Invention
The invention aims to provide a sintering waste heat utilization system and method with constant temperature and variable air quantity.
The invention aims at realizing the following technical scheme:
the invention relates to a sintering waste heat utilization system with constant temperature and variable air volume, which comprises a circular cooler, a circular cooler smoke collecting hood arranged above the circular cooler, a plurality of bellows arranged at the lower part of the circular cooler and a flue gas circulation system; the device is characterized in that the smoke collecting hood of the annular cooler is a through smoke collecting hood of the annular cooler, the through smoke collecting hood of the annular cooler is divided into a high-temperature air taking section and a medium-temperature air taking section, and a high-temperature smoke recovery system, a medium-temperature smoke recovery system and a temperature mixing system are arranged at the upper parts of the high-temperature air taking section and the medium-temperature air taking section;
the high-temperature flue gas recovery system comprises a high-temperature air taking pipeline, a high-temperature air flue, an electric bleeding valve A, an electric regulating valve A and a temperature measuring device A, wherein the high-temperature air taking pipeline is arranged at the upper part of a high-temperature air taking section of a smoke collecting hood of the annular cooler, the upper end of the high-temperature air taking pipeline is communicated with a bleeding chimney, the electric bleeding valve A is arranged at the upper end of the high-temperature air taking pipeline, one end of the high-temperature air flue is communicated with the high-temperature air taking pipeline, the other end of the high-temperature air flue is connected with a high-temperature flue gas inlet of the waste heat boiler, the temperature measuring device A is arranged on the high-temperature air flue, the electric regulating valve A is arranged at the high-temperature flue gas inlet of the waste heat boiler, and the temperature measuring device A is in signal association with the electric regulating valve A;
the medium-temperature flue gas recovery system comprises a medium-temperature air taking pipeline, a medium-temperature air flue, an electric bleeding valve B, an electric regulating valve B and a temperature measuring device B, wherein the medium-temperature air taking pipeline is arranged at the upper part of a medium-temperature air taking section of a smoke collecting hood of the ring cooler, the upper end of the medium-temperature air taking pipeline is communicated with a bleeding chimney, the electric bleeding valve B is arranged at the upper end of the medium-temperature air taking pipeline, one end of the medium-temperature air flue is communicated with the medium-temperature air taking pipeline, the other end of the medium-temperature air flue is connected with a medium-temperature flue gas inlet of the waste heat boiler, the temperature measuring device B is arranged on the medium-temperature air flue, the electric regulating valve B is arranged at the medium-temperature flue gas inlet of the waste heat boiler, and the temperature measuring device B is in signal association with the electric regulating valve B;
the temperature mixing system comprises a mixed flue gas air taking pipeline, a communication pipe, an electric regulating valve C, an electric regulating valve D, a temperature measuring device C and a temperature measuring device D, wherein the mixed flue gas air taking pipeline is arranged on the upper part of a smoke collecting hood of the circular cooler in the middle of a high-temperature air taking section and a medium-temperature air taking section, the communication pipe is a three-way pipe and is composed of a middle main pipeline and two branch pipelines, one end of the middle main pipeline is communicated with an outlet of the mixed flue gas air taking pipeline, the other end of the middle main pipeline is arranged at the middle part of the two branch pipelines and is communicated with the two branch pipelines, a port of one of the two branch pipelines is communicated with a Gao Wenqu air pipe, a port of the other branch pipeline is communicated with the medium-temperature air taking pipeline, the electric regulating valve D, the electric regulating valve C and the temperature measuring device C are respectively arranged on the two branch pipelines, the temperature measuring device D is in signal association with the electric regulating valve D, the temperature measuring device C is in signal association with the electric regulating valve C, and all the electric regulating valves and the temperature measuring devices are electrically connected with the automatic control system, and can be controlled in a control chamber.
Further, a cold air exchanging valve A is arranged at the front part of the temperature measuring device A of the high-temperature air taking pipeline, and a cold air exchanging valve B is arranged at the front part of the temperature measuring device B of the medium-temperature air taking pipeline.
The invention relates to a sintering waste heat utilization method with constant temperature and variable air volume, which adopts the sintering waste heat utilization system with constant temperature and variable air volume and is characterized by comprising the following steps:
A. the upper parts of the high-temperature air taking section and the medium-temperature air taking section of the smoke collecting hood of the annular cooler are provided with a high-temperature smoke recovery system, a medium-temperature smoke recovery system and a temperature mixing system, and the high-temperature smoke and the medium-temperature smoke in the high-temperature air taking section and the medium-temperature air taking section of the smoke collecting hood of the annular cooler are introduced into an exhaust heat boiler of the annular cooler;
B. a temperature measuring device A is arranged on a high-temperature air duct of the high-temperature flue gas recovery system, and an electric regulating valve A is arranged at a high-temperature flue gas inlet of the annular cooler waste heat boiler; a medium temperature air duct of the medium temperature flue gas recovery system is provided with a temperature measuring device B, an electric regulating valve B is arranged at a medium temperature flue gas inlet of the waste heat boiler of the circular cooler, a communication pipe of the temperature mixing system is respectively provided with an electric regulating valve D, a temperature measuring device D, an electric regulating valve C and a temperature measuring device C, which are used for controlling the inlet temperature of high temperature flue gas of the boiler and the inlet temperature of medium temperature flue gas of the boiler, so that the inlet temperature of the high temperature flue gas of the waste heat boiler of the circular cooler is controlled at 400 ℃, the temperature of the medium temperature flue gas of the waste heat boiler of the circular cooler is controlled at 300, and the fluctuation range exceeds plus or minus 10 ℃ for alarming;
C. after the hot air with the temperature of 130-150 ℃ is subjected to heat exchange through the annular cooler waste heat boiler, the hot air is pressurized through a circulating fan, and returns to the air box at the lower part of the annular cooler through a main return air pipeline of the annular cooler and a return air branch pipeline connected with an air box, and the hot air is cooled and heated to form hot air when flowing through the annular cooler trolley from bottom to top and then is sent to the annular cooler waste heat boiler, so that the cyclic utilization is achieved.
In the production operation, the temperature of the flue gas at the high temperature section of the annular cooler is 400+/-50 ℃, the temperature of the flue gas at the medium temperature section is 300+/-50 ℃, and the temperature of the mixing system is 350+/-50 ℃. The flue gas temperature of the mixing system is between the flue gas temperatures of the high and medium temperature sections, and the effect is to adjust the flue gas temperatures of the high and medium temperature by adjusting the mixing amount of the high and low temperature flue gas mixed by the mixing system. In the production operation, when the system normally operates, the opening degrees of the electric regulating valve A and the electric regulating valve B are all opened;
if the high-temperature air taking section and the medium-temperature flue gas in the smoke collecting hood of the annular cooler stably run at 400 ℃ and 300 ℃, the two electric regulating valves D and C on the communication pipe are closed, and air is taken through the high-temperature air taking pipeline and the medium-temperature air taking pipeline; the high-temperature flue gas inlet temperature signal is automatically interlocked with the opening of the electric regulating valve C, the medium-temperature flue gas inlet temperature signal is automatically interlocked with the opening of the electric regulating valve D, and when the high-temperature flue gas inlet temperature of the waste heat boiler of the annular cooler or the medium-temperature flue gas inlet temperature of the waste heat boiler of the annular cooler exceeds a threshold value or is lower than the threshold value, the automatic control system automatically controls the opening of the electric regulating valve C or the opening of the electric regulating valve D to regulate the high-temperature flue gas inlet of the waste heat boiler of the annular cooler and the medium-temperature flue gas inlet temperature of the waste heat boiler of the annular cooler so as to keep the high-temperature flue gas inlet and the medium-temperature flue gas inlet temperature of the waste heat boiler of the annular cooler at the set threshold value;
the system comprises a high-temperature air taking pipeline, a temperature measuring device A, a cold air valve B, a central control part, a cold air valve B, a cold air valve and a cold air valve, wherein the cold air valve A is arranged at the front part of the temperature measuring device A of the high-temperature air taking pipeline, the cold air valve B is arranged at the front part of the temperature measuring device B of the medium-temperature air taking pipeline, and when the blanking temperature of an annular cooler is higher than a normal running value, the temperature of a flue gas inlet is still over-high after the system is automatically regulated, the central control part manually opens the cold air valve corresponding part to keep the temperature of the flue gas inlet at a set threshold value.
Further, when the waste heat boiler of the annular cooler is in fault and needs to be overhauled, the electric regulating valve A and the electric regulating valve B are closed, the electric regulating valve C and the electric regulating valve D of the branch pipe of the communicating pipe are closed simultaneously, the circulating fan is closed, the blower is opened, the electric bleeding valve A on the upper part of the high-temperature air taking pipeline and the electric bleeding valve B on the upper part of the medium-temperature air taking pipeline are opened, and the annular cooler is enabled to meet the normal operation requirement of a sintering system.
The invention has the advantages that:
due to the adoption of the sintering waste heat utilization system with the constant temperature and the variable air quantity, the air quantity change is flexibly regulated through various regulation means, so that the temperature of the waste heat boiler entering the annular cooler is kept stable, the damage of equipment and pipes caused by the overtemperature phenomenon is avoided, and the material performance of the equipment and the pipes is ensured; meanwhile, the problems of low system efficiency, low economical efficiency and the like caused by the phenomenon of low temperature can be avoided, the system is ensured to operate efficiently in a relatively stable working condition, and the economic benefit of the whole system is improved.
Drawings
Fig. 1 is a schematic diagram of a sintering waste heat utilization system with constant temperature and variable air volume.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in FIG. 1, the sintering waste heat utilization system with constant temperature and variable air volume comprises a circular cooler 1, a circular cooler smoke collecting hood 11 arranged above the circular cooler, a plurality of bellows arranged at the lower part of the circular cooler 1 and a flue gas circulation system; the circular cooler 1 is divided into a high-temperature section, a medium-temperature section and a low-temperature section, the flue gas circulation system comprises a circular cooler waste heat boiler 5, a circulating fan 6 connected with the circular cooler waste heat boiler 5, a circular cooler return air main pipeline 7, a return air branch pipeline 9 connected with a bellows and an air blower 8, and the automatic control system is characterized in that a circular cooler fume collecting hood 11 is a through circular cooler fume collecting hood, the through circular cooler fume collecting hood is divided into a high-temperature air taking section and a medium-temperature air taking section, and a high-temperature flue gas recovery system, a medium-temperature flue gas recovery system and a temperature mixing system are arranged at the upper parts of the high-temperature air taking section and the medium-temperature air taking section;
the high-temperature flue gas recovery system comprises a high-temperature air taking pipeline 21, a high-temperature air flue 22, an electric bleeding valve A25, an electric regulating valve A24 and a temperature measuring device A23, wherein the high-temperature air taking pipeline 21 is arranged at the upper part of a high-temperature air taking section of the exhaust fume collecting hood 11 of the annular cooler, the upper end of the high-temperature air taking pipeline 21 is communicated with a bleeding chimney, the electric bleeding valve A25 is arranged at the upper end of the high-temperature air taking pipeline 21, one end of the high-temperature air flue 22 is communicated with the high-temperature air taking pipeline 21, the other end of the high-temperature air flue 22 is connected with a high-temperature flue gas inlet of the waste heat boiler 5 of the annular cooler, the temperature measuring device A23 is arranged on the high-temperature air flue gas inlet of the waste heat boiler 5 of the annular cooler, and the electric regulating valve A24 is in signal association with the electric regulating valve A24;
the medium-temperature flue gas recovery system comprises a medium-temperature air taking pipeline 31, a medium-temperature air flue 32, an electric relief valve B35, an electric regulating valve B34 and a temperature measuring device B33, wherein the medium-temperature air taking pipeline 31 is arranged at the upper part of a medium-temperature air taking section of the exhaust fume collecting hood 11 of the annular cooler, the upper end of the medium-temperature air taking pipeline 31 is communicated with a relief chimney, the electric relief valve B35 is arranged at the upper end of the medium-temperature air taking pipeline 31, one end of the medium-temperature air flue 32 is communicated with the medium-temperature air taking pipeline 31, the other end of the medium-temperature air flue 32 is connected with a medium-temperature flue gas inlet of the waste heat boiler 5 of the annular cooler, the temperature measuring device B33 is arranged on the medium-temperature air flue gas inlet of the waste heat boiler 5 of the annular cooler, and the electric regulating valve B34 is in signal association with the electric regulating valve B34;
the temperature mixing system comprises a mixed flue gas air taking pipeline 41, a communication pipe, an electric regulating valve C47, an electric regulating valve D45, a temperature measuring device C48 and a temperature measuring device D46, wherein the mixed flue gas air taking pipeline 41 is arranged on the upper part of a circular cooler smoke collecting hood in the middle of a high-temperature air taking section and a medium-temperature air taking section, the communication pipe is a three-way pipe and is composed of a middle main pipeline 42 and two branch pipelines 43 and 44, one end of the middle main pipeline 42 is communicated with an outlet of the mixed flue gas air taking pipeline 41, the other end of the middle main pipeline 42 is arranged at the middle part of the two branch pipelines and is communicated with the two branch pipelines, a port of one branch pipeline 43 of the two branch pipelines is communicated with the high-temperature air taking pipeline 21, a port of the other branch pipeline 44 is communicated with the medium-temperature air taking pipeline 31, the electric regulating valve D45, the electric regulating valve D46 and the electric regulating valve C47 and the temperature measuring device C48 are respectively arranged on the two branch pipelines, the temperature measuring device D46 is in signal association with the electric regulating valve D45, the electric regulating valve C48 is in signal association with the electric regulating valve C47 and the electric regulating valve C48, and all electric regulating valves are in electric regulating and controllable systems, and all electric regulating and controllable systems are in electric regulating and controllable systems.
The smoke temperature in the smoke collecting cover 11 of the ring cooler 1 is gradually decreased due to the smoke collecting cover of the ring cooler, the smoke temperature of the high temperature section of the ring cooler is 400+/-50 ℃, the smoke temperature of the middle temperature section of the ring cooler is 300+/-50 ℃ and the temperature of the mixing system is 350+/-50 ℃ in the production operation. The flue gas temperature of the mixing system is between the flue gas temperatures of the high and medium temperature sections, and the effect is to adjust the flue gas temperatures of the high and medium temperature by adjusting the mixing amount of the high and low temperature flue gas mixed by the mixing system.
The invention relates to a sintering waste heat utilization method with constant temperature and variable air volume, which comprises the following steps:
A. the upper parts of the high-temperature air taking section and the medium-temperature air taking section of the annular cooler fume collecting hood 11 are provided with a high-temperature fume recovery system, a medium-temperature fume recovery system and a temperature mixing system, and the high-temperature fume and the medium-temperature fume in the high-temperature air taking section and the medium-temperature air taking section of the annular cooler fume collecting hood are introduced into an annular cooler waste heat boiler 5;
B. a temperature measuring device A23 is arranged on a high-temperature air duct 22 of the high-temperature flue gas recovery system, and an electric regulating valve A24 is arranged at a high-temperature flue gas inlet of the annular cooler waste heat boiler 5; a temperature measuring device B33 is arranged on the medium temperature air duct 32 of the medium temperature flue gas recovery system, an electric regulating valve B34 is arranged at the medium temperature flue gas inlet of the waste heat boiler 5 of the annular cooler, an electric regulating valve D45, a temperature measuring device D46, an electric regulating valve C47 and a temperature measuring device C48 are respectively arranged on a communication pipe of the temperature mixing system for controlling the high temperature flue gas inlet temperature of the waste heat boiler of the annular cooler and the medium temperature flue gas inlet temperature of the waste heat boiler of the annular cooler,
C. after the hot air with the temperature of 130-150 ℃ subjected to heat exchange by the annular cooler waste heat boiler is pressurized by the circulating fan 6, the hot air is conveyed to the lower bellows of the annular cooler through the annular cooler return air main pipeline 7 and the return air branch pipeline 9 connected with the bellows, and the hot air is cooled and heated to form hot air when flowing through the annular cooler trolley from bottom to top and then is conveyed to the annular cooler waste heat boiler 5, so that the cyclic utilization is achieved.
The invention controls the high temperature flue gas inlet temperature of the waste heat boiler of the annular cooler and the medium temperature flue gas inlet temperature of the waste heat boiler of the annular cooler, and comprises the steps of setting the high temperature flue gas inlet temperature of the waste heat boiler of the annular cooler to 400 ℃, setting the medium temperature flue gas temperature of the waste heat boiler of the annular cooler to 300 ℃ in an automatic control system, and alarming when the fluctuation range exceeds plus or minus 10 ℃;
in the production operation, when the system is in normal operation, the opening degrees of the electric regulating valve A24 and the electric regulating valve B24 are all opened;
if the smoke of the high-temperature air taking section and the medium-temperature air taking section in the smoke collecting hood 11 of the annular cooler stably runs at 400 ℃ and 300 ℃, the two electric regulating valves D45 and the electric regulating valve C47 on the communication pipe are closed, and air is taken through the high-temperature air taking pipeline 21 and the medium-temperature air taking pipeline 31; and the high-temperature flue gas inlet temperature signal is automatically interlocked with the opening of the electric regulating valve C47, the medium-temperature flue gas inlet temperature signal is automatically interlocked with the opening of the electric regulating valve D45, and when the high-temperature flue gas inlet temperature of the waste heat boiler of the annular cooler or the medium-temperature flue gas inlet temperature of the waste heat boiler of the annular cooler exceeds a threshold value or is lower than the threshold value, the automatic control system automatically controls the opening of the electric regulating valve F47 or the electric regulating valve E45 to regulate the high-temperature flue gas inlet of the waste heat boiler of the annular cooler and the medium-temperature flue gas inlet temperature of the waste heat boiler of the annular cooler, so that the high-temperature flue gas inlet temperature of the waste heat boiler of the annular cooler is controlled at 400+/-10 ℃, and the medium-temperature flue gas temperature of the waste heat boiler of the annular cooler is controlled at 300+/-10 ℃;
when the waste heat boiler of the annular cooler is in fault and needs to be overhauled, the electric regulating valve A24 and the electric regulating valve B34 are closed, the electric regulating valve C47 and the electric regulating valve D45 of the branch pipe of the communicating pipe are closed, the circulating fan 6 is closed, the blower 8 is opened, the electric bleeding valve A25 on the upper part of the high-temperature air taking pipeline and the electric bleeding valve B35 on the upper part of the medium-temperature air taking pipeline are opened, and the annular cooler is enabled to meet the normal operation requirement of a sintering system. The electric regulating valve A24 and the electric regulating valve B34 can also be used as standby, and the opening degree of manual control is matched with the temperature of the high-temperature flue gas inlet or the medium-temperature flue gas inlet of the circular cooler waste heat boiler for regulating.
According to the invention, the cold air exchanging valve A26 is arranged at the front part of the temperature measuring device A23 of the high-temperature air taking pipeline 21, the cold air exchanging valve B36 is arranged at the front part of the temperature measuring device B33 of the medium-temperature air taking pipeline 31, and when the blanking temperature of the annular cooler is higher than the normal running value, the central control manually opens the cold air exchanging valve at the corresponding part when the temperature of the flue gas inlet is still over-temperature after the automatic adjustment of the system, so that the temperature of the flue gas inlet is kept at a set threshold value.
The system of the invention is flexible and various in operation, signals of the electric regulating valve and the temperature measuring device at each place are led to the control room, and the constant temperature variable air quantity can be regulated by matching in various regulating modes and only adopting the high temperature air taking pipeline, the medium temperature air taking pipeline and the mixed flue gas air taking pipeline for taking air.
Claims (5)
1. The sintering waste heat utilization system comprises a ring cooler, a ring cooler smoke collecting hood arranged above the ring cooler, a plurality of bellows arranged at the lower part of the ring cooler and a smoke circulation system; the device is characterized in that the smoke collecting hood of the annular cooler is a through smoke collecting hood of the annular cooler, the through smoke collecting hood of the annular cooler is divided into a high-temperature air taking section and a medium-temperature air taking section, and a high-temperature smoke recovery system, a medium-temperature smoke recovery system and a temperature mixing system are arranged at the upper parts of the high-temperature air taking section and the medium-temperature air taking section;
the high-temperature flue gas recovery system comprises a high-temperature air taking pipeline, a high-temperature air flue, an electric bleeding valve A, an electric regulating valve A and a temperature measuring device A, wherein the high-temperature air taking pipeline is arranged at the upper part of a high-temperature air taking section of a smoke collecting hood of the annular cooler, the upper end of the high-temperature air taking pipeline is communicated with a bleeding chimney, the electric bleeding valve A is arranged at the upper end of the high-temperature air taking pipeline, one end of the high-temperature air flue is communicated with the high-temperature air taking pipeline, the other end of the high-temperature air flue is connected with a high-temperature flue gas inlet of the waste heat boiler, the temperature measuring device A is arranged on the high-temperature air flue, the electric regulating valve A is arranged at the high-temperature flue gas inlet of the waste heat boiler, and the temperature measuring device A is in signal association with the electric regulating valve A;
the medium-temperature flue gas recovery system comprises a medium-temperature air taking pipeline, a medium-temperature air flue, an electric bleeding valve B, an electric regulating valve B and a temperature measuring device B, wherein the medium-temperature air taking pipeline is arranged at the upper part of a medium-temperature air taking section of a smoke collecting hood of the ring cooler, the upper end of the medium-temperature air taking pipeline is communicated with a bleeding chimney, the electric bleeding valve B is arranged at the upper end of the medium-temperature air taking pipeline, one end of the medium-temperature air flue is communicated with the medium-temperature air taking pipeline, the other end of the medium-temperature air flue is connected with a medium-temperature flue gas inlet of the waste heat boiler, the temperature measuring device B is arranged on the medium-temperature air flue, the electric regulating valve B is arranged at the medium-temperature flue gas inlet of the waste heat boiler, and the temperature measuring device B is in signal association with the electric regulating valve B;
the temperature mixing system comprises a mixed flue gas air taking pipeline, a communication pipe, an electric regulating valve C, an electric regulating valve D, a temperature measuring device C and a temperature measuring device D, wherein the mixed flue gas air taking pipeline is arranged on the upper part of a smoke collecting hood of the circular cooler in the middle of a high-temperature air taking section and a medium-temperature air taking section, the communication pipe is a three-way pipe and is composed of a middle main pipeline and two branch pipelines, one end of the middle main pipeline is communicated with an outlet of the mixed flue gas air taking pipeline, the other end of the middle main pipeline is arranged at the middle part of the two branch pipelines and is communicated with the two branch pipelines, a port of one of the two branch pipelines is communicated with a Gao Wenqu air pipe, a port of the other branch pipeline is communicated with the medium-temperature air taking pipeline, the electric regulating valve D, the electric regulating valve C and the temperature measuring device C are respectively arranged on the two branch pipelines, the temperature measuring device D is in signal association with the electric regulating valve D, the temperature measuring device C is in signal association with the electric regulating valve C, and all the electric regulating valves and the temperature measuring devices are electrically connected with the automatic control system, and can be controlled in a control chamber.
2. The sintering waste heat utilization system with constant temperature and variable air quantity according to claim 1, wherein a cold air exchanging valve A is arranged at the front part of a temperature measuring device A of the high-temperature air taking pipeline, and a cold air exchanging valve B is arranged at the front part of a temperature measuring device B of the medium-temperature air taking pipeline.
3. The sintering waste heat utilization method of the constant temperature variable air volume adopts the sintering waste heat utilization system of the constant temperature variable air volume, and is characterized by comprising the following steps:
A. the upper parts of the high-temperature air taking section and the medium-temperature air taking section of the smoke collecting hood of the annular cooler are provided with a high-temperature smoke recovery system, a medium-temperature smoke recovery system and a temperature mixing system, and the high-temperature smoke and the medium-temperature smoke in the high-temperature air taking section and the medium-temperature air taking section of the smoke collecting hood of the annular cooler are introduced into an exhaust heat boiler of the annular cooler;
B. a temperature measuring device A is arranged on a high-temperature air duct of the high-temperature flue gas recovery system, and an electric regulating valve A is arranged at a high-temperature flue gas inlet of the annular cooler waste heat boiler; a medium temperature air duct of the medium temperature flue gas recovery system is provided with a temperature measuring device B, an electric regulating valve B is arranged at a medium temperature flue gas inlet of the waste heat boiler of the circular cooler, a communication pipe of the temperature mixing system is respectively provided with an electric regulating valve D, a temperature measuring device D, an electric regulating valve C and a temperature measuring device C, which are used for controlling the inlet temperature of high temperature flue gas of the boiler and the inlet temperature of medium temperature flue gas of the boiler, so that the inlet temperature of the high temperature flue gas of the waste heat boiler of the circular cooler is controlled at 400 ℃, the temperature of the medium temperature flue gas of the waste heat boiler of the circular cooler is controlled at 300 ℃, and the fluctuation range exceeds plus or minus 10 ℃ to alarm;
C. after the hot air with the temperature of 130-150 ℃ is subjected to heat exchange through the annular cooler waste heat boiler, the hot air is pressurized through a circulating fan, and returns to the air box at the lower part of the annular cooler through a main return air pipeline of the annular cooler and a return air branch pipeline connected with an air box, and the hot air is cooled and heated to form hot air when flowing through the annular cooler trolley from bottom to top and then is sent to the annular cooler waste heat boiler, so that the cyclic utilization is achieved.
4. The method for utilizing sintering waste heat with constant temperature and variable air volume according to claim 3, wherein the method comprises the following steps:
in the production operation, the temperature of the flue gas at the high temperature section of the annular cooler is 400+/-50 ℃, the temperature of the flue gas at the medium temperature section is 300+/-50 ℃ and the temperature of the mixing system is 350+/-50 ℃; before the flue gas temperature of the mixing system is between the flue gas temperature of the high and medium temperature sections, the effect is to adjust the flue gas temperature of the high and medium temperature by adjusting the mixing amount of the high and low temperature flue gas mixed in the mixing system; in the production operation, when the system normally operates, the opening degrees of the electric regulating valve A and the electric regulating valve B are all opened;
if the high-temperature air taking section and the medium-temperature flue gas in the smoke collecting hood of the annular cooler stably run at 400 ℃ and 300 ℃, the two electric regulating valves D and C on the communication pipe are closed, and air is taken through the high-temperature air taking pipeline and the medium-temperature air taking pipeline; the high-temperature flue gas inlet temperature signal is automatically interlocked with the opening of the electric regulating valve C, the medium-temperature flue gas inlet temperature signal is automatically interlocked with the opening of the electric regulating valve D, and when the high-temperature flue gas inlet temperature of the waste heat boiler of the annular cooler or the medium-temperature flue gas inlet temperature of the waste heat boiler of the annular cooler exceeds a threshold value or is lower than the threshold value, the automatic control system automatically controls the opening of the electric regulating valve C or the opening of the electric regulating valve D to regulate the high-temperature flue gas inlet of the waste heat boiler of the annular cooler and the medium-temperature flue gas inlet temperature of the waste heat boiler of the annular cooler so as to keep the high-temperature flue gas inlet and the medium-temperature flue gas inlet temperature of the waste heat boiler of the annular cooler at the set threshold value;
the system comprises a high-temperature air taking pipeline, a temperature measuring device A, a cold air valve B, a central control part, a cold air valve B, a cold air valve and a cold air valve, wherein the cold air valve A is arranged at the front part of the temperature measuring device A of the high-temperature air taking pipeline, the cold air valve B is arranged at the front part of the temperature measuring device B of the medium-temperature air taking pipeline, and when the blanking temperature of an annular cooler is higher than a normal running value, the temperature of a flue gas inlet is still over-high after the system is automatically regulated, the central control part manually opens the cold air valve corresponding part to keep the temperature of the flue gas inlet at a set threshold value.
5. The method for utilizing sintering waste heat with constant temperature and variable air volume according to claim 3, wherein the method comprises the following steps: when the waste heat boiler of the annular cooler is in fault and needs to be overhauled, the electric regulating valve A and the electric regulating valve B are closed, the electric regulating valve C and the electric regulating valve D of the branch pipe of the communicating pipe are closed simultaneously, the circulating fan is closed, the blower is opened, and the electric bleeding valve A on the upper part of the high-temperature air taking pipeline and the electric bleeding valve B on the upper part of the medium-temperature air taking pipeline are opened, so that the annular cooler meets the normal operation requirement of a sintering system.
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