CN114353061B - Sintering flue gas ultra-low emission system and method based on circulating fluidized bed desulfurization - Google Patents
Sintering flue gas ultra-low emission system and method based on circulating fluidized bed desulfurization Download PDFInfo
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Abstract
The invention discloses a sintering flue gas ultra-low emission system and method based on circulating fluidized bed desulfurization, and belongs to the technical field of flue gas purification. The system comprises a sintering machine, a front-stage flue, a rear-stage flue, an original flue gas heat exchanger, a high-capacity dust remover, a high-capacity exhaust fan, a high-capacity desulfurizing tower, a high-capacity gas-solid separator, a low-capacity dust remover, a low-capacity exhaust fan, a low-capacity desulfurizing tower, a low-capacity gas-solid separator, a desulfurization flue gas heat exchanger, a direct-fired furnace, a flue gas denitration device, an induced draft fan and a chimney. According to the temperature of the sintering flue gas and the condition that the sulfur dioxide and nitrogen oxide contents present sectional characteristics, the heat and flow of the sintering flue gas are fully and reasonably matched so as to meet the reaction conditions of flue gas desulfurization and denitrification, realize the ultralow emission of the sintering flue gas, and effectively reduce the fuel consumption of an ultralow emission system on the premise of meeting the load fluctuation of the sintering production process.
Description
Technical Field
The invention relates to the technical field of flue gas purification, in particular to a sintering flue gas ultra-low emission system and method based on circulating fluidized bed desulfurization.
Background
In recent years, the development of the iron and steel industry in China is rapid, and the iron and steel industry has become the first country of production and consumption worldwide. Meanwhile, in the hot working process of steel production, a large amount of fuel and ore are consumed, and air pollutants such as dust, sulfur dioxide, nitrogen oxides and the like are discharged in a large amount. In iron and steel enterprises, the pollutant emission amount generated by the sintering process occupies the largest proportion, and the strict control of the pollutant emission amount generated by the sintering process is the key for realizing the ultralow emission of the iron and steel enterprises.
Opinion about ultra low emissions of the advanced implementation of the steel industry (ring atmosphere [2019 ]]35), the requirement that the steel project newly built (including moving) nationally reaches the ultra-low emission level in principle, and the ultra-low emission modification of the iron and steel enterprises in the key areas is basically completed before the 2025 year is over 80 percent of capacity is completed nationwide, wherein the specific index of the ultra-low emission requires that the average value of the emission concentration of the sintering flue gas and dust is not higher than 10mg/Nm when the average value is small 3 The average value of the sulfur dioxide emission concentration is not higher than 35mg/Nm in a small period 3 The average value of the nitrogen oxide emission concentration is not higher than 50mg/Nm in a small period 3 。
The sintering flue gas has the characteristics of large flue gas load fluctuation range, low flue gas temperature and obvious flue gas component segmentation characteristics. Due to the technical characteristics of proper flue gas treatment capacity range, compact equipment, no wastewater discharge, capability of cooperatively treating multiple pollutants and the like, the circulating fluidized bed desulfurization technology is more applied in the sintering flue gas ultra-low discharge modification process, the load application range of the corresponding desulfurization device is generally 60% -110%, but the sintering flue gas load fluctuation range is large, and the sintering flue gas desulfurization device can possibly operate under the condition that the flue gas flow is lower than the rated value of 40%. Because the average temperature of sintering flue gas is lower than 150 ℃, when flue gas denitration treatment is carried out, the flue gas temperature must be increased to meet the reaction conditions required by SCR denitration technology, and at present, the flue gas temperature is increased by adopting a method of afterburning gas, but because the flow of sintering flue gas is large, a great amount of gas is consumed in the flue gas temperature increasing process. Patent CN101306311B discloses a dry method and a device for removing sintering flue gas, which keep the operation stability of a desulfurization device by adopting a flue gas purifying circulation mode under a low load condition, but the proposal has the problem of increasing the fuel consumption of a flue gas denitration device when being applied to an ultralow emission system.
Therefore, under the environmental protection policy requirement of ultralow emission in the steel industry, a further improvement room still exists for realizing the ultralow emission mode of sintering flue gas. According to the temperature of the sintering flue gas and the condition that the sulfur dioxide and nitrogen oxide contents show sectional characteristics, the flue gas segmentation technology can be applied on the premise of meeting the process requirements, and the sectional characteristics of the pollutant contents of the flue gas are treated respectively, so that the effects of energy conservation and emission reduction are achieved.
Disclosure of Invention
The invention provides a sintering flue gas ultra-low emission system and method based on circulating fluidized bed desulfurization, which are characterized in that the sintering flue gas is fully and reasonably subjected to heat and flow matching according to the temperature of the sintering flue gas and the condition that the content of sulfur dioxide and nitrogen oxides in the sintering flue gas is sectionalized by combining process units such as flue gas segmentation, semi-dry desulfurization and SCR denitration so as to meet the reaction conditions of flue gas desulfurization and denitration, so that the sintering flue gas ultra-low emission is realized, and meanwhile, the fuel consumption of an ultra-low emission system is effectively reduced on the premise of meeting the load fluctuation of sintering production process.
The invention provides a sintering flue gas ultralow emission system based on circulating fluidized bed desulfurization, which is characterized by comprising a sintering machine (1), a front-stage flue (2), a rear-stage flue (3), an original flue gas heat exchanger (4), a high-capacity dust remover (5), a high-capacity exhaust fan (6), a high-capacity desulfurizing tower (7), a high-capacity gas-solid separator (8), a low-capacity dust remover (9), a low-capacity exhaust fan (10), a low-capacity desulfurizing tower (11), a low-capacity gas-solid separator (12), a desulfurization flue gas heat exchanger (13), a direct-fired furnace (14), a flue gas denitration device (15), an induced draft fan (16) and a chimney (17).
The invention provides a sintering flue gas ultra-low emission system based on circulating fluidized bed desulfurization, which is characterized in that raw flue gas generated by a sintering machine (1) consists of front-stage raw flue gas and rear-stage raw flue gas, and the total flow of the raw flue gasQ 1 Is equal to the flow of the primary flue gas in the front sectionQ 2 And the flow rate of the raw flue gas at the rear sectionQ 3 And (3) summing.
The invention provides a sintering flue gas ultra-low emission system based on circulating fluidized bed desulfurization, which is characterized in that a high-capacity desulfurizing tower (7) and a high-capacity gas-solid separator (8) form a high-capacity circulating fluidized bed desulfurization system, and a low-capacity desulfurizing tower (11) and a low-capacity gas-solid separator (12) form a low-capacity circulating fluidized bed desulfurization system; diameter of high capacity desulfurizing tower (7)D 1 Diameter of low-capacity desulfurizing tower (11)D 2 The ratio of (2) is 1.7-1.75.
The invention provides a sintering flue gas ultra-low emission system based on circulating fluidized bed desulfurization, which is characterized in that a flue gas denitration device (15) adopts a Selective Catalytic Reduction (SCR) denitration technology.
The invention provides a sintering flue gas ultralow emission system based on circulating fluidized bed desulfurization, which is characterized in that a heat exchange element of an original flue gas heat exchanger (4) is made of a nonmetallic material.
The invention provides a method for realizing ultralow emission of sintering flue gas, which is characterized in that when the total flow of raw flue gasQ 1 Lower flow limit less than or equal toQ L When the flue gas desulfurization device is used, the original flue gas heat exchanger (4), the high-capacity dust remover (5), the high-capacity exhaust fan (6), the high-capacity desulfurization tower (7) and the high-capacity gas-solid separator (8) are not used; front section of raw flue gas is from frontThe section flue (2) sequentially passes through a low-capacity dust remover (9), a low-capacity exhaust fan (10) and a low-capacity desulfurizing tower (11) to enter a low-capacity gas-solid separator (12); the rear-section raw flue gas sequentially passes through a low-capacity dust remover (9), a low-capacity exhaust fan (10) and a low-capacity desulfurizing tower (11) from a rear-section flue (3) to enter a low-capacity gas-solid separator (12); the desulfurization flue gas at the outlet of the low-capacity gas-solid separator (12) sequentially passes through a desulfurization flue gas heat exchanger (13), a direct-fired furnace (14) and a flue gas denitration device (15), and then sequentially passes through the desulfurization flue gas heat exchanger (13) and an induced draft fan (16) to enter a chimney (17) for emission.
The invention provides a method for realizing ultralow emission of sintering flue gas, which is characterized in that when the flow rate is lower than the limit flow rateQ L <Total flow of raw flue gasQ 1 <Upper flow limitQ H When the flue gas desulfurization device is used, the original flue gas heat exchanger (4), the low-capacity dust remover (9), the low-capacity exhaust fan (10), the low-capacity desulfurization tower (11) and the low-capacity gas-solid separator (12) are not used; the front-stage raw flue gas sequentially passes through a high-capacity dust remover (5), a high-capacity exhaust fan (6) and a high-capacity desulfurizing tower (7) from a front-stage flue (2) to enter a high-capacity gas-solid separator (8); the rear-section raw flue gas sequentially passes through a high-capacity dust remover (5), a high-capacity exhaust fan (6) and a high-capacity desulfurizing tower (7) from a rear-section flue (3) to enter a high-capacity gas-solid separator (8); the desulfurization flue gas at the outlet of the high-capacity gas-solid separator (8) sequentially passes through a desulfurization flue gas heat exchanger (13), a direct-fired furnace (14) and a flue gas denitration device (15), and then sequentially passes through the desulfurization flue gas heat exchanger (13) and an induced draft fan (16) to enter a chimney (17) for emission.
The invention provides a method for realizing ultralow emission of sintering flue gas, which is characterized in that when the total flow of raw flue gasQ 1 Not less than upper limit flowQ H When the flue gas desulfurization device is used, the original flue gas heat exchanger (4), the high-capacity dust remover (5), the high-capacity exhaust fan (6), the high-capacity desulfurizing tower (7), the high-capacity gas-solid separator (8), the low-capacity dust remover (9), the low-capacity exhaust fan (10), the low-capacity desulfurizing tower (11) and the low-capacity gas-solid separator (12) are all put into operation; flow is equal toQ 3 Part of front-stage raw flue gas of the (2) sequentially passes through a raw flue gas heat exchanger (4), a high-capacity dust remover (5), a high-capacity exhaust fan (6) and a high-capacity desulfurizing tower (7) to enter a high-capacity gas-solid separator (8); the flow is equal to%Q 2 -Q 3 ) Part of the front-section raw flue gas of the (2) sequentially passes through a high-capacity dust remover (5), a high-capacity exhaust fan (6) and a high-capacity desulfurizing tower (7) to enter a high-capacity gas-solid separator (8); the rear-section raw flue gas sequentially passes through a raw flue gas heat exchanger (4), a low-capacity dust remover (9), a low-capacity exhaust fan (10) and a low-capacity desulfurizing tower (11) from a rear-section flue gas channel (3) to enter a low-capacity gas-solid separator (12); the desulfurization flue gas at the outlet of the high-capacity gas-solid separator (8) sequentially passes through a desulfurization flue gas heat exchanger (13), a direct-fired furnace (14) and a flue gas denitration device (15), and then sequentially passes through the desulfurization flue gas heat exchanger (13) and an induced draft fan (16) to enter a chimney (17) for emission; the desulfurization flue gas at the outlet of the low-capacity gas-solid separator (12) enters a chimney (17) through a draught fan (16) to be discharged.
The invention provides a method for realizing ultralow emission of sintering flue gas, which is characterized by lower flow limiting flowQ L Is the total flow of the raw flue gasQ 1 45% -50% of rated value, the lower limiting flowQ L Is the total flow of the raw flue gasQ 1 75% -80% of rated value.
The invention provides a method for realizing ultralow emission of sintering flue gas, which is characterized in that when clean flue gas enters a chimney (17) from a draught fan (16), the sulfur dioxide content is less than 35mg/Nm 3 Nitrogen oxide content of less than 50mg/Nm 3 Dust content of less than 10mg/Nm 3 。
The invention provides a sintering flue gas ultra-low emission system and a sintering flue gas ultra-low emission method based on circulating fluidized bed desulfurization, when the total flow of raw flue gasQ 1 When the flow rate is less than 45% -50% of the rated flow rate, the high-capacity circulating fluidized bed system is not used, and only the low-capacity circulating fluidized bed desulfurization system is used; the front-stage raw flue gas and the rear-stage raw flue gas enter a low-capacity circulating fluidized bed desulfurization system for desulfurization; low-capacity gas-solid separator (12)The desulfurization flue gas of the outlet sequentially passes through a desulfurization flue gas heat exchanger (13), a direct-fired furnace (14) and a flue gas denitration device (15), and then sequentially passes through the desulfurization flue gas heat exchanger (13) and an induced draft fan (16) to enter a chimney (17) for emission.
The invention provides a sintering flue gas ultra-low emission system and a sintering flue gas ultra-low emission method based on circulating fluidized bed desulfurization, when the total flow of raw flue gasQ 1 When the flow rate is 50% -75% of the rated flow rate, the low-capacity circulating fluidized bed system is not used, and only the high-capacity circulating fluidized bed desulfurization system is used; the front-stage raw flue gas and the rear-stage raw flue gas enter a high-capacity circulating fluidized bed desulfurization system for desulfurization; the desulfurization flue gas at the outlet of the high-capacity gas-solid separator (8) sequentially passes through a desulfurization flue gas heat exchanger (13), a direct-fired furnace (14) and a flue gas denitration device (15), and then sequentially passes through the desulfurization flue gas heat exchanger (13) and an induced draft fan (16) to enter a chimney (17) for emission.
The invention provides a sintering flue gas ultra-low emission system and a sintering flue gas ultra-low emission method based on circulating fluidized bed desulfurization, when the total flow of raw flue gasQ 1 When the flow rate is more than 75% -80% of the rated flow rate, the low-capacity circulating fluidized bed system and the high-capacity circulating fluidized bed desulfurization system are both put into use. The flue gas with the flow accounting for 20% -25% of the rated total flow of the original flue gas is extracted from the bellows with the flue gas temperature of 70-90 ℃ to serve as the front-stage original flue gas for heat exchange, meanwhile, the flue gas with the flow accounting for 20% -25% of the rated total flow of the original flue gas is extracted from the bellows with the flue gas temperature of 250-320 ℃ to serve as the rear-stage original flue gas, and in addition, the flue gas with the flow accounting for 40% -50% of the rated total flow of the original flue gas is extracted from the bellows with the flue gas temperature of 130-150 ℃ to directly enter the high-capacity dust remover (5). After the two parts of flue gas which participate in heat exchange pass through the original flue gas heat exchanger (4), the temperature of the two parts of flue gas is 130-150 ℃. The front-stage raw flue gas accounting for 60% -75% of the rated total flow of the raw flue gas passes through a high-capacity dust remover (5) and a high-capacity exhaust fan (6) and then enters a high-capacity circulating fluidized bed desulfurization system for desulfurization, and desulfurization flue gas at the outlet of a high-capacity gas-solid separator (8) sequentially passes through a desulfurization flue gas heat exchanger (13), a direct-fired furnace (14) and a flue gas denitration device (15) and then sequentially passes through the desulfurization flue gas heat exchanger (13) and an induced draft fan (16) to enter a chimney (17) for emission. Occupy the original smoke ratingAnd the Duan Yuan flue gas with the total flow rate of 20% -25% enters a low-capacity circulating fluidized bed desulfurization system for desulfurization, and the desulfurization flue gas at the outlet of the low-capacity gas-solid separator (12) enters a chimney (17) through a draught fan (16) for discharge.
The invention provides a sintering flue gas ultra-low emission system and a sintering flue gas ultra-low emission method based on circulating fluidized bed desulfurization, wherein the temperature of raw flue gas entering a desulfurization tower is 110-130 ℃, and the temperature is suitable for the operation of a semi-dry desulfurization device, so that the desulfurization efficiency and the utilization rate of a desulfurizing agent are improved.
The invention provides a sintering flue gas ultra-low emission system and a sintering flue gas ultra-low emission method based on circulating fluidized bed desulfurization, when the total flow of raw flue gasQ 1 When the nitrogen oxide content is more than 75% -80% of the rated flow, the content of the original nitrogen oxide in the rear-stage raw flue gas accounting for 20% -25% of the rated total flow of the raw flue gas is less than 50mg/Nm 3 The denitration treatment is not needed, and the fuel consumption of the flue gas denitration device can be effectively saved.
Based on the above summary, the present invention has the following beneficial effects:
1. when the system load is less than 45% -50%, only the low-capacity circulating fluidized bed desulfurization system is put into use, so that the desulfurization device can keep stable operation when the system load is as low as 25%, and the load adaptability of the device is obviously enhanced.
2. When the system load is more than 75% -80%, part of the flue gas is extracted from the raw flue gas to participate in heat exchange, and the original nitrogen oxide content of the rear-stage raw flue gas is less than 50mg/Nm 3 The denitration treatment is not needed, and the fuel consumption of the flue gas denitration device can be effectively saved.
3. When the system load is more than 75% -80%, part of the flue gas is extracted from the raw flue gas to participate in heat exchange, and meanwhile, the temperatures of the two parts of the raw flue gas are adjusted to be suitable for the operation of the semi-dry desulfurization technology, so that the desulfurization efficiency and the absorbent utilization rate are improved.
4. The circulating fluidized bed desulfurization device is matched with dust removal equipment, and can realize ultralow emission of sulfur dioxide and dust.
Drawings
Fig. 1 is a schematic diagram of a sintering flue gas ultra-low emission system based on circulating fluidized bed desulfurization.
The device comprises a 1-sintering machine, a 2-front-stage flue, a 3-rear-stage flue, a 4-raw flue gas heat exchanger, a 5-high-capacity dust remover, a 6-high-capacity exhaust fan, a 7-high-capacity desulfurizing tower, an 8-high-capacity gas-solid separator, a 9-low-capacity dust remover, a 10-low-capacity exhaust fan, an 11-low-capacity desulfurizing tower, a 12-low-capacity gas-solid separator, a 13-clean flue gas heat exchanger, a 14-direct-fired furnace, a 15-flue gas denitration device, a 16-induced draft fan and a 17-chimney.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings.
Example 1
The sintering flue gas ultra-low emission system based on circulating fluidized bed desulfurization for a certain sintering machine is shown in figure 1. The sinter yield of the sintering machine 1 is 375 t/h, and the rated flue gas flow is 120 ten thousand Nm 3 /h。
When the total flow of the raw flue gasQ 1 50 ten thousand Nm 3 In the time of/h, the high-capacity circulating fluidized bed system is not used, and only the low-capacity circulating fluidized bed desulfurization system is used; the front-stage raw flue gas and the rear-stage raw flue gas enter a low-capacity circulating fluidized bed desulfurization system for desulfurization; the desulfurization flue gas at the outlet of the low-capacity gas-solid separator (12) sequentially passes through a desulfurization flue gas heat exchanger (13), a direct-fired furnace (14) and a flue gas denitration device (15), and then sequentially passes through the desulfurization flue gas heat exchanger (13) and an induced draft fan (16) to enter a chimney (17) for emission.
When the total flow of the raw flue gasQ 1 75 ten thousand Nm 3 In the time of/h, the low-capacity circulating fluidized bed system is not used, and only the high-capacity circulating fluidized bed desulfurization system is used; the front-stage raw flue gas and the rear-stage raw flue gas enter a high-capacity circulating fluidized bed desulfurization system for desulfurization; the desulfurization flue gas at the outlet of the high-capacity gas-solid separator (8) sequentially passes through a desulfurization flue gas heat exchanger (13), a direct-fired furnace (14) and a flue gas denitration device (15), and then sequentially passes through the desulfurization flue gas heat exchanger (13) and an induced draft fan (16) to enter a chimney (17) for emission.
When the total flow of the raw flue gasQ 1 100 ten thousand Nm 3 And at the time of/h, the low-capacity circulating fluidized bed system and the high-capacity circulating fluidized bed desulfurization system are both put into use. The flow rate extracted from a bellows with the flue gas temperature of 70-90 ℃ is 25 ten thousand Nm 3 The flue gas of/h is used as the primary flue gas of the front section for heat exchange, and the flow rate of the flue gas is extracted from an air box with the temperature of 250-320 ℃ to be 25 ten thousand Nm 3 The flue gas of/h is used as the raw flue gas of the later stage, and the flow rate of the flue gas is extracted from a bellows with the temperature of 130-150 ℃ to be 50 ten thousand Nm 3 The flue gas of/h directly enters a high-capacity dust remover (5). After the two parts of flue gas which participate in heat exchange pass through the original flue gas heat exchanger (4), the temperature of the two parts of flue gas is 130-150 ℃. Flow rate of 75 ten thousand Nm 3 And (3) the front-stage raw flue gas of/h enters a high-capacity circulating fluidized bed desulfurization system to be desulfurized after passing through a high-capacity dust remover (5) and a high-capacity exhaust fan (6), and the desulfurized flue gas at the outlet of the high-capacity gas-solid separator (8) sequentially passes through a desulfurized flue gas heat exchanger (13), a direct-fired furnace (14) and a flue gas denitration device (15) and then sequentially passes through the desulfurized flue gas heat exchanger (13) and an induced draft fan (16) to enter a chimney (17) to be discharged. The flow rate was 25 ten thousand Nm 3 The Duan Yuan flue gas after per hour enters a low-capacity circulating fluidized bed desulfurization system for desulfurization, the desulfurization flue gas at the outlet of a low-capacity gas-solid separator (12) enters a chimney (17) for discharge through a draught fan (16), and the original nitrogen oxide content of the flue gas is less than 50mg/Nm 3 The denitration treatment is not needed, and the fuel consumption of the flue gas denitration device can be effectively saved.
Claims (7)
1. The sintering flue gas ultralow emission system based on circulating fluidized bed desulfurization is characterized by comprising a pretreatment system consisting of a sintering machine (1), a front-stage flue (2), a rear-stage flue (3) and a raw flue gas heat exchanger (4); a high-capacity flue gas circulating fluidized bed desulfurization system is formed by a high-capacity dust remover (5), a high-capacity exhaust fan (6), a high-capacity desulfurizing tower (7) and a high-capacity gas-solid separator (8); the low-capacity flue gas circulating fluidized bed desulfurization system is composed of a low-capacity dust remover (9), a low-capacity exhaust fan (10), a low-capacity desulfurizing tower (11) and a low-capacity gas-solid separator (12); the rear part is composed of a desulfurization flue gas heat exchanger (13), a direct-fired furnace (14), a flue gas denitration device (15), an induced draft fan (16) and a chimney (17)A management system; total flow rate Q of raw flue gas 1 Is equal to the flow Q of the primary flue gas at the front section 2 And the flow rate Q of the raw flue gas at the rear section 3 And (3) summing; when the total flow rate Q of the raw flue gas 1 Not less than upper limit flow Q H The system operation mode is as follows: flow is equal to Q 3 Part of front-stage raw flue gas of the (2) sequentially passes through a raw flue gas heat exchanger (4), a high-capacity dust remover (5), a high-capacity exhaust fan (6) and a high-capacity desulfurizing tower (7) to enter a high-capacity gas-solid separator (8); flow is equal to (Q) 2 -Q 3 ) Part of the front-section raw flue gas of the (2) sequentially passes through a high-capacity dust remover (5), a high-capacity exhaust fan (6) and a high-capacity desulfurizing tower (7) to enter a high-capacity gas-solid separator (8); the rear-section raw flue gas sequentially passes through a raw flue gas heat exchanger (4), a low-capacity dust remover (9), a low-capacity exhaust fan (10) and a low-capacity desulfurizing tower (11) from a rear-section flue gas channel (3) to enter a low-capacity gas-solid separator (12); the desulfurization flue gas at the outlet of the high-capacity gas-solid separator (8) sequentially passes through a desulfurization flue gas heat exchanger (13), a direct-fired furnace (14) and a flue gas denitration device (15), and then sequentially passes through the desulfurization flue gas heat exchanger (13) and an induced draft fan (16) to enter a chimney (17) for emission; the desulfurization flue gas at the outlet of the low-capacity gas-solid separator (12) enters a chimney (17) through a draught fan (16) to be discharged.
2. The ultra-low emission system for sintering flue gas based on circulating fluidized bed desulfurization of claim 1, wherein when the lower limit flow rate Q L <Total flow rate Q of raw flue gas 1 <Upper flow limit Q H When the system is used, the original flue gas heat exchanger (4), the low-capacity dust remover (9), the low-capacity exhaust fan (10), the low-capacity desulfurizing tower (11) and the low-capacity gas-solid separator (12) are not used, and the system operation mode is as follows: the front-stage raw flue gas sequentially passes through a high-capacity dust remover (5), a high-capacity exhaust fan (6) and a high-capacity desulfurizing tower (7) from a front-stage flue (2) to enter a high-capacity gas-solid separator (8); the rear-section raw flue gas sequentially passes through a high-capacity dust remover (5), a high-capacity exhaust fan (6) and a high-capacity desulfurizing tower (7) from a rear-section flue (3) to enter a high-capacity gas-solid separator (8); the desulfurization flue gas at the outlet of the high-capacity gas-solid separator (8) sequentially passes through a desulfurization flue gas heat exchanger (13), a direct-fired furnace (14) and a flue gas denitration device (15), and then sequentially passes through the desulfurization flue gas heat exchanger (13) and induced draftThe machine (16) enters a chimney (17) for discharging.
3. The ultra-low emission system for sintering flue gas based on circulating fluidized bed desulfurization according to claim 1, wherein when the total flow rate Q of raw flue gas is 1 Lower limit flow Q is less than or equal to L When the system is used, the original flue gas heat exchanger (4), the high-capacity dust remover (5), the high-capacity exhaust fan (6), the high-capacity desulfurizing tower (7) and the high-capacity gas-solid separator (8) are not put into use, and the system operation mode is as follows: the front-stage raw flue gas sequentially passes through a low-capacity dust remover (9), a low-capacity exhaust fan (10) and a low-capacity desulfurizing tower (11) from a front-stage flue (2) to enter a low-capacity gas-solid separator (12); the rear-section raw flue gas sequentially passes through a low-capacity dust remover (9), a low-capacity exhaust fan (10) and a low-capacity desulfurizing tower (11) from a rear-section flue (3) to enter a low-capacity gas-solid separator (12); the desulfurization flue gas at the outlet of the low-capacity gas-solid separator (12) sequentially passes through a desulfurization flue gas heat exchanger (13), a direct-fired furnace (14) and a flue gas denitration device (15), and then sequentially passes through the desulfurization flue gas heat exchanger (13) and an induced draft fan (16) to enter a chimney (17) for emission.
4. The ultra-low emission system of sintering flue gas based on circulating fluidized bed desulfurization according to claim 1, wherein the flue gas denitration device (15) adopts a Selective Catalytic Reduction (SCR) denitration technology.
5. The sintering flue gas ultra-low emission system based on circulating fluidized bed desulfurization according to claim 1, wherein the heat exchange element of the raw flue gas heat exchanger (4) is made of a nonmetallic material.
6. The ultra-low emission system for sintering flue gas based on circulating fluidized bed desulfurization according to claim 1, wherein the diameter D of the high-capacity desulfurizing tower (7) is as follows 1 Diameter D of low-capacity desulfurizing tower (11) 2 The ratio of (2) is 1.7-1.75.
7. A method for realizing ultra-low emission of sintering flue gas by adopting the system as set forth in claim 1, wherein the lower limit flow rate Q L Is the total flow Q of the raw flue gas 1 45% -50% of rated value, upper limit flow Q H Is the total flow Q of the raw flue gas 1 75% -80% of rated value, and when clean flue gas enters a chimney (17) from a draught fan (16), the sulfur dioxide content is less than 35mg/Nm 3 Nitrogen oxide content less than 50mg/Nm 3 Dust content less than 10mg/Nm 3 。
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| DE102010042271A1 (en) * | 2010-10-11 | 2012-04-12 | Robert Bosch Gmbh | Method for temperature management of emission control system in exhaust duct of internal combustion engine, involves including operation modes of thermoelectric generators in temperature management of emission control system |
| CN102168922B (en) * | 2011-03-11 | 2014-06-04 | 东北大学 | Device and method for efficiently recycling and utilizing waste heat resources in sintering process |
| CN107213785B (en) * | 2017-05-25 | 2020-08-07 | 江苏新世纪江南环保股份有限公司 | Method and device for denitration, desulfurization and dust removal of FCC (fluid catalytic cracking) tail gas by ammonia process |
| CN109513349A (en) * | 2018-12-21 | 2019-03-26 | 山东洲蓝环保科技有限公司 | Sintering flue gas low-temp desulfurization method of denitration |
| CN110368792A (en) * | 2019-08-19 | 2019-10-25 | 北京首钢国际工程技术有限公司 | A kind of double tower Two-way Cycle wet desulphurization device for wearing series-parallel flue |
| CN110953894A (en) * | 2019-12-16 | 2020-04-03 | 北京中航泰达环保科技股份有限公司 | Sintering machine flue gas circulation purification and waste heat utilization system and method |
| CN111121472A (en) * | 2019-12-27 | 2020-05-08 | 北京中航泰达环保科技股份有限公司 | Sintering machine flue gas internal and external combined cycle purification and waste heat utilization system |
| CN211716597U (en) * | 2020-01-20 | 2020-10-20 | 山西平朔煤矸石发电有限责任公司 | Double fluidized bed pyrolysis combustion waste heat utilization system |
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| CN112675691B (en) * | 2020-12-15 | 2024-04-26 | 中冶京诚工程技术有限公司 | Flue gas semi-dry desulfurization system and desulfurization method |
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