CN203177670U - Waste heat utilization device of tail low-temperature smoke of sinter cooler - Google Patents

Abstract

The utility model provides a low-temperature flue gas waste heat utilization device at the tail of a sintering cooler. The recovery pipe is connected to the air inlet of the waste heat boiler through the main smoke inlet pipe. The first control valve is installed on the flue gas recovery pipe between the main smoke inlet pipe and the chimney of the third cold zone, and the first control valve is installed on the flue gas recovery pipe between the main smoke inlet pipe and the chimney of the fourth cold zone. The second control valve is installed on the flue gas recovery pipe, and the control valve is installed on the chimney in the cold area. A circulation pipe is arranged, and the circulation pipe is connected with the air box of the sintering cooler, and a circulation valve is installed on the circulation pipe. The utility model can recycle and utilize the heat in the waste gas discharged from the third cooling zone and the fourth cooling zone of the sintering cooler, which not only saves energy, but also reduces the impact of flue gas discharge on the environment.

Description

Low-temperature flue gas waste heat utilization device at the tail of sintering cooler

technical field

The utility model relates to a sintering cooler, in particular to a device for utilizing waste heat of low-temperature flue gas at the tail of the sintering cooler. the

Background technique

In the existing sinter cooler, the ring cooler and belt cooler usually divide the cooling area into four cooling areas during the blast cooling process of sinter. The temperature of the first cold zone is about 400℃, the temperature of the second cooling zone is about 300℃, the temperature of the third cooling zone is about 200℃, and the temperature of the fourth cooling zone is about 120℃. At present, the sintering waste heat recovery project is mainly for the first cooling zone of the sintering cooler and the hot exhaust gas with higher temperature in the second cooling zone are recycled, while the third cooling zone and the fourth cooling zone have low temperature, there is no equipment that can effectively recover the temperature of this part of the exhaust gas, this part of heat is wasted, and at the same time The high-temperature flue gas emitted by the boiler is directly discharged into the atmosphere through the chimney, which will also aggravate the greenhouse effect and affect the environment. the

Utility model content

The purpose of this utility model is to provide a low-temperature flue gas waste heat utilization device at the tail of the sintering cooler, which can recycle the heat in the waste gas discharged from the third cooling zone and the fourth cooling zone of the sintering cooler, which not only saves energy, but also reduces The impact of flue gas emissions on the environment. the

In order to achieve the above object, the utility model is realized through the following technical solutions: it includes a sintering cooler, the third cold zone chimney and the fourth cold zone chimney at the tail of the sintering cooler are connected through a flue gas recovery pipe, and the flue gas recovery pipe passes through the inlet The smoke main pipe is connected to the air inlet of the waste heat boiler, the first control valve is installed on the flue gas recovery pipe between the smoke main pipe and the chimney of the third cold zone, and the flue gas recovery pipe between the smoke main pipe and the chimney of the fourth cold zone The second control valve is installed on the top, the third control valve is installed on the chimney of the third cold zone, and the fourth control valve is installed on the chimney of the fourth cold zone. , A circulation pipe is arranged on the discharge pipe between the induced draft fan and the relief valve, the circulation pipe is connected with the bellows of the sintering cooler, and a circulation valve is installed on the circulation pipe. The outer wall of the outer supply pipe of the waste heat boiler is provided with an insulation sleeve, and an insulation chamber is formed between the inner wall of the insulation sleeve and the outer wall of the outer supply pipe. One end of the insulation sleeve is provided with an inlet pipe, and the other end of the insulation sleeve is provided with an outlet pipe. The chimneys of the four cold zones are connected, the heat preservation control valve is installed on the inlet pipe, the temperature sensor is installed in the chimney of the fourth cold zone, and the temperature sensors are respectively connected with the heat preservation control valve and the second control valve through wires. The waste heat boiler is a hot water boiler. the

The utility model has the advantages of being able to recycle the heat in the waste gas discharged from the third cooling zone and the fourth cooling zone of the sintering cooler, which not only saves energy, but also reduces the impact of flue gas discharge on the environment, and the heat loss in the process of external supply Less, higher heating efficiency, etc. the

Description of drawings

Fig. 1 is the structural representation of the utility model. the

Detailed ways

The low-temperature flue gas waste heat utilization device at the tail of the sintering cooler described in the utility model includes a sintering cooler 1, and the third cold zone chimney 2 and the fourth cold zone chimney 5 at the tail of the sintering cooler 1 are connected through a flue gas recovery pipe 3 , the flue gas recovery pipe 3 is connected to the air inlet of the waste heat boiler 4 through the smoke inlet main pipe 6, and the first control valve 7 is installed on the flue gas recovery pipe 3 between the smoke inlet main pipe 6 and the chimney 2 in the third cold zone, and the smoke inlet The second control valve 15 is installed on the flue gas recovery pipe 3 between the main pipe 6 and the chimney 5 in the fourth cold zone, the third control valve 8 is installed on the chimney 2 in the third cold zone, and the fourth control valve 8 is installed on the chimney 5 in the fourth cold zone. The valve 9 and the gas outlet of the waste heat boiler 4 are connected to the discharge pipe 10, the discharge pipe 10 is equipped with an induced draft fan 11 and a discharge valve 12, and the discharge pipe 10 between the induced draft fan 11 and the discharge valve 12 is provided with a circulation pipe 13 and a circulation pipe 13 It is connected with the air box of the sintering cooler 1, and a circulation valve 14 is installed on the circulation pipe 13. When it is necessary to recover the heat in the waste gas discharged from the third cooling zone and the fourth cooling zone of the sintering cooler, close the third control valve 8 and the fourth control valve 9, open the first control valve 7 and the second control valve 15, and make the third cooling The exhaust gas discharged from the third and fourth cooling areas is mixed and then enters the waste heat boiler 4. The temperature of the exhaust gas discharged from the third cooling area and the fourth cooling area is about 170°C after being mixed. Or circulate through the circulation pipe 13 to the air box of the sinter cooler 1 for recycling, and the waste heat boiler 4 absorbs the heat in the waste gas to prepare hot water, steam or other heat transfer medium for external supply. The utility model can recycle and utilize the heat in the waste gas discharged from the third cooling zone and the fourth cooling zone of the sintering cooler, which not only saves energy, but also reduces the impact of flue gas discharge on the environment. the

In order to reduce the heat loss in the process of external supply, the utility model can arrange a thermal insulation sleeve 17 on the outer periphery of the external supply pipe 16 of the waste heat boiler 4, and form a thermal insulation cavity 18 between the inner wall of the thermal insulation sleeve 17 and the outer wall of the external supply pipe 16. One end of the thermal insulation sleeve 17 is provided with an inlet pipe 19, and the other end of the thermal insulation sleeve 17 is provided with an outlet pipe 20. The inlet pipe 19 is connected to the chimney 5 in the fourth cold zone, and an insulation control valve 21 is installed on the inlet pipe 19. A temperature sensor 22 is installed, and the temperature sensor 22 is respectively connected with the heat preservation control valve 21 and the second control valve 15 through wires. The temperature of the exhaust gas discharged from the fourth cold zone fluctuates greatly. When the temperature of the exhaust gas discharged from the fourth cold zone can meet the demand of heat recovery, the heat preservation control valve 21 and the second control valve 15 can be opened at the same time, and a part of the exhaust gas is used for heat recovery. , another part of the exhaust gas enters the insulation sleeve 17 to insulate the external supply pipe 16; when the temperature of the exhaust gas discharged from the fourth cold zone cannot meet the demand for heat recovery, the second control valve 15 can be closed, and at this time the exhaust gas discharged from the fourth cold zone Exhaust gas is only used for heat preservation of the external supply pipe 16 . The temperature of the exhaust gas discharged from the fourth cold zone is detected by the temperature sensor 22 . the

The waste heat boiler described in the utility model is preferably a hot water boiler, because the waste gas temperature required for preparing hot water is low and the heating efficiency is high, which is more suitable for use in the third cooling zone and the fourth cooling zone of the sintering cooler. Waste heat boilers can also use steam boilers, organic heat carrier boilers and other types of waste heat boilers, but these boilers require higher exhaust gas temperature and lower heating efficiency in actual use. the

Claims (3)

1. The low-temperature flue gas waste heat utilization device at the tail of the sintering cooler, including the sintering cooler (1), characterized in that: the third cold zone chimney (2) and the fourth cold zone chimney (5) at the tail of the sintering cooler (1) The flue gas recovery pipe (3) is connected between them, the flue gas recovery pipe (3) is connected to the air inlet of the waste heat boiler (4) through the smoke inlet main pipe (6), and the smoke inlet main pipe (6) is connected to the chimney of the third cold zone Install the first control valve (7) on the flue gas recovery pipe (3) between (2), and install the flue gas recovery pipe (3) between the smoke inlet main pipe (6) and the fourth cold zone chimney (5) The second control valve (15), the third control valve (8) is installed on the third cold zone chimney (2), the fourth control valve (9) is installed on the fourth cold zone chimney (5), the waste heat boiler (4) The air outlet is connected with the discharge pipe (10), and the induced draft fan (11) and the relief valve (12) are installed on the discharge pipe (10), and the discharge pipe (10) between the induced draft fan (11) and the relief valve (12) is installed on the discharge pipe (10) The circulation pipe (13), the circulation pipe (13) is connected with the air box of the sinter cooler (1), and the circulation valve (14) is installed on the circulation pipe (13). 2. The low-temperature flue gas waste heat utilization device at the tail of the sintering cooler according to claim 1, characterized in that: the external supply pipe (16) of the waste heat boiler (4) is provided with a thermal insulation sleeve (17) on the outer circumference of the tube wall, and the thermal insulation sleeve (17) A thermal insulation chamber (18) is formed between the inner wall and the outer wall of the outer supply pipe (16), the inlet pipe (19) is arranged at one end of the insulation sleeve (17), and the outlet pipe (20) is arranged at the other end of the insulation sleeve (17), The inlet pipe (19) is connected with the fourth cold zone chimney (5), the heat preservation control valve (21) is installed on the inlet pipe (19), the temperature sensor (22) is installed in the fourth cold zone chimney (5), the temperature sensor (22 ) are respectively connected with the heat preservation control valve (21) and the second control valve (15) through wires. 3. The waste heat utilization device of low-temperature flue gas at the tail of the sinter cooler according to claim 1 or 2, characterized in that: the waste heat boiler is a hot water boiler.

Images