CN215295846U - Sintered ore sensible heat recovery device and special sintered ore cooling furnace - Google Patents
Sintered ore sensible heat recovery device and special sintered ore cooling furnace Download PDFInfo
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- CN215295846U CN215295846U CN202023177853.2U CN202023177853U CN215295846U CN 215295846 U CN215295846 U CN 215295846U CN 202023177853 U CN202023177853 U CN 202023177853U CN 215295846 U CN215295846 U CN 215295846U
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Abstract
A sensible heat recovery device for hot sinter and a special sinter cooling furnace belong to the technical field of sinter cooling and waste heat recovery processes. The method comprises the following steps: the system comprises a sinter cooling furnace, a feeding system, an air inlet system, a discharging system, an exhaust system, a primary dust removal system, a waste heat recovery system, a final dust removal system, a power system and a measurement and control system. The invention solves the problems of air leakage and parameter fluctuation of a waste heat system of the conventional sinter cooling system, reduces the heat dissipation loss with the external environment and has obvious energy-saving effect; meanwhile, the structure is simple, the operation cost is low, and the device is safe and reliable.
Description
Technical Field
The utility model relates to a hot sintering deposit sensible heat recovery unit and special sintering deposit cooling furnace belongs to sintering deposit cooling and waste heat recovery technology technical field.
Background
The energy consumption of the sintering process of the iron and steel enterprises is only second to that of the iron making process, and in the total energy consumption of the sintering process, the sensible heat of the sintering ore accounts for 35.4% and the sensible heat of the waste gas accounts for 22.9% in the thermal expenditure of the sintering machine. Therefore, the key point of the waste heat recovery of the sintering plant is the sensible heat of the sintered mineral products and the waste heat recovery of the sintering waste flue gas.
At present, the sensible heat recovery mode of the sinter adopts a ring cooling technology or a belt cooling technology, the hot sinter carries out heat convection with cold air on a ring cooling machine or a belt cooling machine, and heated air is used for power generation or heating through a waste heat boiler so as to achieve the purpose of recovering the sensible heat of the sinter.
The circular cooling or the belt cooling is carried out on a moving trolley, and sintered ores are cooled by air draft or air blast, and the equipment has the following defects:
1. the sealing problem between the trolley and the air box in the cooling process is difficult to solve, the waste heat utilization efficiency is fast to attenuate, and the operating environment is greatly polluted by the leakage of smoke dust;
2. the fluctuation of waste heat parameters is large, so that the stability and safety of a waste heat utilization system are endangered;
3. the flue gas temperature is lower, and the waste heat utilization rate is low.
In view of the above disadvantages, it is of great practical significance to develop a new method for recovering sensible heat from sintered ore and a cooling apparatus.
Disclosure of Invention
The utility model aims at providing a sintering deposit sensible heat recovery unit and special sintering deposit cooling furnace to solve the not enough of prior art existence, reach the purpose that reduces the sintering process energy consumption.
The basic idea of the utility model is that: the hot sintering cake discharged from the tail part of the sintering machine is crushed by a single-roller crusher, enters a sintering ore cooling furnace through a hot sintering ore feeding system, is fully contacted with cooling gas entering through an air inlet system in the sintering ore cooling furnace and carries out convective heat transfer, the hot sintering ore is cooled in the descending process, the cooled sintering ore is discharged through a discharging system, heated high-temperature tail gas is discharged through an exhaust system from an upper exhaust port and a lower exhaust port of the cooling furnace and enters a primary dust remover for primary dust removal through a high-temperature tail gas ring pipe, the primary dust removal aims at reducing the dust content of the tail gas and improving the convective heat transfer coefficient of the gas, the gas subjected to primary dust removal enters a waste heat recovery system, the cooled tail gas discharged from the waste heat recovery system enters a final dust removal system, and the tail gas subjected to final dust removal is discharged from a chimney through a main draught fan. The main induced draft fan adopts inverter motor for ensure to keep the slight negative pressure in the sinter cooling furnace all the time, prevent that the tail gas that heats in the cooling furnace from leaking, lead to the loss of energy, this is this also the novel main thinking and the method of the air leakage problem that can not solve of present sinter cooling method of using.
The utility model discloses one of the basic technical scheme: is a sinter sensible heat recovery device, comprising: sinter cooling furnace, feed system, air intake system, discharge system, exhaust system, first dust pelletizing system, waste heat recovery system, dust pelletizing system, driving system and observing and controlling system, its characterized in that:
1) the sinter cooling furnace is a cylindrical furnace and is provided with a feed inlet, a discharge outlet, a primary air port, a secondary air port, a conical section air inlet, an upper exhaust port and a lower exhaust port;
2) the feeding system is connected with a feeding hole of the sinter cooling furnace and consists of a receiving bin, a middle diffusion chute and a guide cone;
3) the air inlet system, namely a primary air port, a secondary air port and a cone section air inlet of the sinter cooling furnace are directly communicated with the atmosphere;
4) the discharge system is connected with a discharge hole at the bottom of the sinter cooling furnace;
5) the exhaust system is connected with an upper exhaust port and a lower exhaust port of the sinter cooling furnace;
6) the primary dust removal system, the waste heat recovery system and the final dust removal system are sequentially arranged between the exhaust system and the power system;
7) the power system mainly comprises a main induced draft fan and an exhaust chimney, wherein the main induced draft fan adopts a variable frequency motor.
The primary dust removal system consists of a high-temperature resistant dust remover and an inlet and outlet pipeline;
the waste heat recovery system mainly comprises a waste heat boiler and an inlet and outlet pipeline;
the final dust removal system comprises an electric dust remover or a bag-type dust remover and a conveying pipeline, wherein the electric dust removal system is suggested to be adopted;
the measurement and control system comprises a metering and control system.
Furthermore, in order to ensure that the central position of the sinter cooling furnace is uniformly cooled, a central air pipe is arranged at the lower part of the sinter cooling furnace, an air inlet of the central air pipe is connected with an air blower, and a stop valve is arranged on an outlet pipeline of the air blower.
Furthermore, in order to ensure that the feeding system of the sinter cooling furnace can meet the requirement of edge distribution, the discharge hole of the middle diffusion chute is of a cone structure with a small upper part and a large lower part, and the guide cone is matched with the middle diffusion chute to form an inclined material flow channel.
Furthermore, in order to recover low-temperature sensible heat carried by tail gas discharged by the main draught fan, the temperature of the tail gas at the inlet of the waste heat boiler is increased, the heat exchange efficiency is improved, and a temperature adjusting air port is additionally arranged between a primary air port and a secondary air port of the sinter cooling furnace. The temperature-adjusting air port is connected with the outlet pipeline of the main induced draft fan, and the connecting pipeline is provided with an electric adjusting valve for adjusting the amount of the circulating tail gas entering the cooling furnace.
Furthermore, in order to solve the problem of instability of parameters of high-temperature tail gas entering the waste heat system, an electric regulating valve is arranged on an outlet pipeline of the exhaust outlet of the cooling furnace and used for controlling the flow of the exhaust outlet of the cooling furnace, so that the purpose of regulating the gas inlet parameters of the waste heat system is achieved.
Furthermore, a communicating pipe is arranged between the central air pipe inlet pipeline and the main induced draft fan outlet pipeline, and an electric valve is arranged on the communicating pipe, so that partial tail gas discharged by the main induced draft fan is sent into the sintering cooling furnace through the central air pipe, and the exhaust temperature of the cooling furnace is increased.
The second of the basic technical scheme of the utility model: the utility model provides an realize sinter sensible heat recovery device's special sinter cooling furnace, its characterized in that:
1) the sinter cooling furnace is a cylindrical furnace and consists of two sections, wherein the upper part is a straight section, and the lower part is a conical section structure with a large upper part and a small lower part;
2) the cylindrical cooling furnace is provided with a top feeding hole and a bottom discharging hole;
3) the cylindrical cooling furnace is provided with a primary air port, a secondary air port, a conical section air inlet, an upper air outlet and a lower air outlet;
4) and a high-temperature-resistant and wear-resistant heat-insulating lining plate is arranged on the inner wall of the cylindrical cooling furnace.
In order to ensure that the inlet air flow is uniformly distributed in the sinter cooling furnace and realize uniform cooling of the sinter, the primary air port, the secondary air port and the cone section air inlet are uniformly arranged along the circumferential direction, and the primary air port and the secondary air port are not arranged on the same axial section.
In order to ensure that the airflow is uniformly distributed in the sinter cooling furnace, the upper exhaust port and the lower exhaust port are uniformly arranged along the circumferential direction, and the upper exhaust port and the lower exhaust port are not arranged on the same axial section.
In order to avoid heat loss caused by convective heat transfer between the sinter cooling furnace and the atmospheric environment, ceramic fibers are arranged between the cylindrical cooling furnace and the heat insulation lining plate, and meanwhile, a high-temperature-resistant binder is adopted for firmly bonding.
In order to ensure that the center position of the sinter cooling furnace is uniformly cooled, a central air pipe is arranged at the conical section of the sinter cooling furnace, is fixed on the furnace shell of the sinter cooling furnace and is made of high-temperature-resistant and wear-resistant materials.
In order to recover sensible heat carried by tail gas discharged by the main draught fan, the temperature of the tail gas at the inlet of the waste heat boiler is increased, the heat exchange efficiency is improved, and a temperature adjusting air port is additionally arranged between a primary air port and a secondary air port of the side wall of the sinter cooling furnace.
Furthermore, the temperature adjusting air ports are uniformly arranged along the circumferential direction.
The utility model discloses the main beneficial effect who produces lies in:
1. the problem of current sinter cooling system leak out is solved. Because the heat exchange between the sinter and the cooling gas is carried out in the sinter cooling furnace, and the sinter cooling furnace is always in a micro negative pressure state, high-temperature gas is prevented from leaking into the atmosphere, the problems of serious air leakage and low waste heat recovery efficiency of the conventional sinter cooling system are effectively solved, meanwhile, the environmental pollution caused by the leakage of smoke dust can be avoided, and the environmental protection benefit is obvious.
2. The utility model discloses considered sintering tail gas's cyclic utilization, improved waste heat system heat exchange efficiency greatly. The low-temperature tail gas is sent into the furnace as a cooling medium through the temperature adjusting air port of the cooling furnace, so that the effect of obviously improving the temperature of the tail gas at the outlet of the cooling furnace is achieved, and the heat exchange efficiency of the waste heat boiler is greatly improved.
3. The problem of fluctuation of the parameters of the waste heat system is solved, and the long-term stable operation of the waste heat system is ensured. Through adjusting the electric control valve on the exhaust outlet and the high-temperature flue gas ring pipe connecting pipeline, the parameters of the tail gas at the inlet of the waste heat system are adjusted, and the problem that the stability of the operation of the waste heat recovery system is influenced is solved.
4. And the heat dissipation loss between the sinter cooling furnace and the external environment is reduced. Through the heat insulation lining plate and the heat insulation ceramic fiber pad in the sinter cooling furnace, the wall heat dissipation of the sinter cooling furnace is reduced, and the utilization rate of waste heat is improved.
5. The utility model discloses need not consider the system seal problem, simple structure, working costs are lower, safe and reliable.
Drawings
Fig. 1 is a flow chart of example 1 of a method for recovering sensible heat from a hot sintered ore according to the present invention.
Fig. 2 is a flow chart of example 2 of a method for recovering sensible heat from hot sinter according to the present invention.
Fig. 3 is a schematic structural view of a sinter cooling furnace used in a method for recovering sensible heat from hot sinter according to the present invention.
Fig. 4 is an enlarged view of a portion a of fig. 3.
The following are marked in the figure: 1. sintering machine; 2. a single roll crusher; 3. a receiving bin; 4. a middle diffusion chute; 5. a material guide cone; 6. a sinter cooling furnace; 7. a discharge valve; 8. a plate feeder; 9. a high temperature resistant dust remover; 10. A waste heat boiler; 11. a final dust collector; 12. a main induced draft fan; 13. a chimney; 14. an electric control valve; 15. An electric control valve; 16. a high temperature tail gas ring pipe; 17. an electric control valve; 18. a blower; 19. a shut-off valve; 20. connecting a pipeline; 21. connecting a pipeline; 6-1, a feed inlet; 6-2, furnace shell; 6-3, ceramic fiber layer; 6-4, wear-resistant lining boards; 6-5, an upper exhaust port; 6-6, lower exhaust ports; 6-7, primary air ports; 6-8, a temperature adjusting tuyere; 6-9 parts of secondary air ports; 6-10 parts of a conical section air inlet; 6-11 parts of a central air pipe; 6-12 parts of discharge port.
Detailed Description
The present invention will be described with reference to the following embodiments and drawings.
Because the device and the special sinter cooling furnace thereof are closely connected, the device and the special sinter cooling furnace thereof are merged and explained.
Example 1 is shown in fig. 1, 3 and 4.
The specific workflow of this example 1 is as follows: the hot sintering cake discharged by the sintering machine 1 enters a hot sintering ore receiving bin 3 after being crushed by a single-roll crusher 2, the hot sintering ore enters a sintering ore cooling furnace 6 through an inclined material flow channel formed by a middle diffusion chute 4 and a guide cone 5 after being buffered in the receiving bin 3, the hot sintering ore is cooled by cold air entering from a primary air port 6-7, a secondary air port 6-9 and a cone section air inlet 6-10 in the descending process in the sintering ore cooling furnace 6, the cooled sintering ore is discharged from a discharge port 6-12 of the sintering ore cooling furnace 6 through a discharge valve 7 and a plate type ore feeder 8, the heated cold air is led out from an upper exhaust port 6-5 and a lower exhaust port 6-6 of the sintering ore cooling furnace 6 through a high-temperature tail gas ring pipe 16, the led high-temperature tail gas enters a high-temperature resistant dust remover 9, and semi-clean gas after large-particle dust carried in the gas is removed by the high-temperature dust remover 9 enters a waste heat boiler 10, an outlet pipeline of the waste heat boiler is connected with a final dust remover 11, the tail gas cooled by the waste heat boiler 10 enters the final dust remover 11, is further purified in the final dust remover 11 and is discharged into the atmosphere through a main induced draft fan 12 and a chimney 13.
In order to ensure the uniform cooling of the central position of the sinter cooling furnace 6, a central air pipe 6-11 is arranged at the conical section of the sinter cooling furnace 6, an air inlet of the central air pipe 6-11 is connected with a blower 18, and a stop valve 19 is arranged on an outlet pipeline of the blower.
In order to recover the heat carried by the tail gas discharged by the main induced draft fan 12, improve the temperature of the tail gas at the inlet of the waste heat boiler 10 and improve the heat exchange efficiency, a temperature adjusting air port 6-8 is additionally arranged between a primary air port 6-7 and a secondary air port 6-9 of the sinter cooling furnace 6, the temperature adjusting air port 6-8 is connected with an outlet pipeline of the main induced draft fan 12, and an electric adjusting valve 14 is arranged on a connecting pipeline 20 and used for adjusting the amount of circulating tail gas entering the cooling furnace 6.
In order to solve the problem of instability of parameters of high-temperature tail gas entering the waste heat boiler 10, an electric regulating valve 17 is arranged on a connecting pipeline between the exhaust port 6-6 of the cooling furnace 6 and the high-temperature tail gas ring pipe 16 and is used for controlling the flow of the tail gas of the exhaust port 6-6 of the cooling furnace 6 so as to achieve the purpose of regulating the inlet temperature of the waste heat boiler 10.
Example 2 is shown in fig. 2, 3 and 4.
In this embodiment 2, an improvement is made on the basis of embodiment 1, in which a communication pipe 21 is provided between an inlet pipeline of the central air duct 6-11 and an outlet pipeline of the main induced draft fan 12, and an electric control valve 15 is provided on the communication pipe 21 to close a shut-off valve 19. Partial tail gas discharged by the main induced draft fan 12 is sent into the sintering cooling furnace 6 through the central air pipes 6-11, and the temperature of the tail gas can be increased.
Otherwise, reference is made to the statements made in example 1.
Claims (6)
1. A sinter sensible heat recovery apparatus comprising: sinter cooling furnace, feed system, air intake system, discharge system, exhaust system, first dust pelletizing system, waste heat recovery system, dust pelletizing system, driving system and observing and controlling system, its characterized in that:
1) the sinter cooling furnace is a cylindrical furnace and is provided with a feed inlet, a discharge outlet, a primary air port, a secondary air port, a conical section air inlet, an upper exhaust port and a lower exhaust port;
2) the feeding system is connected with a feeding hole at the top of the sinter cooling furnace and consists of a receiving bin, a middle diffusion chute and a guide cone;
3) the air inlet system, namely a primary air port, a secondary air port and a cone section air inlet of the sinter cooling furnace are directly communicated with the atmosphere;
4) the discharge system is arranged at the bottom of the sinter cooling furnace and is connected with a discharge hole of the sinter cooling furnace;
5) the exhaust system is connected with an upper exhaust port and a lower exhaust port of the sinter cooling furnace;
6) the primary dust removal system, the waste heat recovery system and the final dust removal system are sequentially arranged between the exhaust system and the power system;
7) the power system mainly comprises a main induced draft fan and an exhaust chimney, wherein the main induced draft fan adopts a variable frequency motor.
2. The sinter sensible heat recovery apparatus of claim 1, wherein: and a central air pipe is arranged at the lower part of the sinter cooling furnace, and an air inlet of the central air pipe is connected with an air blower.
3. The sinter sensible heat recovery apparatus of claim 1, wherein: the discharge hole of the middle diffusion chute is of a cone structure with a small upper part and a big lower part.
4. The sinter sensible heat recovery apparatus of claim 1, wherein: and a temperature adjusting air port is additionally arranged between the primary air port and the secondary air port and is connected with an outlet pipeline of the main induced draft fan.
5. The sinter sensible heat recovery apparatus of claim 1, wherein: and an electric regulating valve is arranged on an outlet pipeline of the lower exhaust port of the cooling furnace.
6. A dedicated sinter cooling furnace for realizing the sensible heat recovery apparatus of sinter as claimed in claim 1, 2, 3, 4 or 5, wherein:
1) the sinter cooling furnace is a cylindrical furnace and consists of two sections, wherein the upper part is a straight section, and the lower part is a conical section structure with a large upper part and a small lower part;
2) the sinter cooling furnace is provided with a top feeding hole and a bottom discharging hole;
3) the sinter cooling furnace is provided with a primary air port, a secondary air port, a conical section air inlet, an upper air outlet and a lower air outlet;
4) the inner wall of the sinter cooling furnace is provided with a high-temperature-resistant and wear-resistant heat-insulating lining plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023177853.2U CN215295846U (en) | 2020-12-25 | 2020-12-25 | Sintered ore sensible heat recovery device and special sintered ore cooling furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023177853.2U CN215295846U (en) | 2020-12-25 | 2020-12-25 | Sintered ore sensible heat recovery device and special sintered ore cooling furnace |
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| CN215295846U true CN215295846U (en) | 2021-12-24 |
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| CN202023177853.2U Active CN215295846U (en) | 2020-12-25 | 2020-12-25 | Sintered ore sensible heat recovery device and special sintered ore cooling furnace |
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