CN205561546U - Be used for high -efficient recycle system of sintering deposit cooling and sensible heat - Google Patents

Abstract

The utility model provides a be used for high -efficient recycle system of sintering deposit cooling and sensible heat, including: only be used for mixing the step -by -step sintering machine that the iron ore material carries out the sintering, a sintering deposit carries out the vertical cooling kiln of refrigerated for being directed at after the sintering breakage, the feeding mechanism of setting between the feed inlet of the discharge gate of step -by -step sintering machine and vertical cooling kiln receiving cone, connect gravitational precipitator and high temperature flue gas unit in the gas outlet on vertical cooling kiln upper portion respectively, the setting is at the unloader and the belt conveyor of vertical cooling kiln discharge gate department, a vertical two exhaust -heat boiler that press for the heat exchange, an air inlet of the gaseous unit of low temperature is connected to its gas outlet, the air inlet of vertical cooling kiln lower part is connected to the gas outlet of the gaseous unit of low temperature, power generation system is connected to vertical two exhaust -heat boiler's of pressure heat exchange tube. The utility model discloses can make sintering deposit and cooling air at a confined space reverse flow, prolong sintering deposit cool time, the heat transfer is more abundant, improves the thermal efficiency of system by a wide margin, has realized the high -efficient recycle of sintering deposit sensible heat.

Description

A high-efficiency recovery and utilization system for sinter cooling and sensible heat

technical field

The utility model relates to cooling and sensible heat recovery of sintered ore in the iron and steel industry. In particular, it relates to a system for sinter cooling and sensible heat efficient recovery and utilization that can replace traditional on-machine cooling to realize sintering.

Background technique

The energy consumption of the sintering process in the iron and steel production process accounts for about 10% to 20% of the total energy consumption, which is the second largest energy consumption process after the ironmaking process. In the energy consumption of sintering, the sensible heat of sintering ore accounts for about 30% of the total energy consumption of sintering, and the recovery ratio of this part of energy consumption is less than 30%, which wastes a lot of energy, has huge recovery space, and has great market potential. There are three kinds of sinter cooling methods at present: one is on-machine cooling, that is, the sintering machine is extended, and after the sintering process is completed, it continues to blow or draw air to cool the sinter; the other is a belt cooler, which is in the After the sintering process is completed, it is unloaded to a belt cooler similar to the sintering machine for blast or exhaust cooling after thermal crushing; the third type is an annular cooler. During the cooling process of sinter, the heat energy becomes high-temperature flue gas, the temperature is between 100-400 ℃, the waste heat boiler is set up for heat exchange, and low-parameter saturated steam or superheated steam is produced, which is used for the production of domestic steam in steel mills or for generate electricity.

The above sinter cooling methods and waste heat recovery mainly have the following disadvantages:

1. Serious air leakage and high power consumption. The three cooling methods are to place the sinter on the trolley, and cool the sinter by blowing or drawing air. The sealing problem between the trolley and the bellows is difficult to solve. Generally, the air leakage rate is more than 20%, or even as high as 50%. , increasing cooling power consumption.

2. Insufficient heat exchange. Cross-flow heat exchange between sinter and cooling air in belt cooler or ring cooler, the heat transfer effect is poor; the accumulation height of sinter material layer is low, the heat exchange time between sinter and cooling air is short, and the heat exchange is insufficient.

3. The waste heat utilization efficiency is low. Because the two ends of the cooling machine cannot be sealed, a large amount of wild wind is mixed in. Since the wild wind does not pass through the sintered material layer, it not only increases the power and power consumption of the fan, but also greatly reduces the temperature of the flue gas after heat exchange; In the existing sintering machine waste heat power generation system, the air is generally taken from the higher temperature sections I and II of the belt cooler or ring cooler, and the temperature difference between the sintering ore and the cooling air heat exchange end is large, the flue gas temperature is low, and the working capacity is lost. Large, waste heat utilization efficiency is low.

4. The waste heat parameters fluctuate greatly. The output, temperature, and composition of sinter fluctuate greatly during the production process, resulting in large fluctuations in flue gas parameters after heat exchange, which has a great impact on waste heat utilization.

5. Regardless of the belt cooler or the annular cooler, they are bulky, high investment, high energy consumption, heavy equipment maintenance workload, and long project investment recovery period.

Contents of the invention

The technical problem to be solved by the utility model is to provide a sintered ore and cooling air flow in reverse in a closed space, prolong the sintered ore cooling time, heat exchange more fully, greatly improve the thermal efficiency of the system, and realize the sensible heat of sintered ore A high-efficiency recovery system for sinter cooling and sensible heat recovery.

The technical solution adopted by the utility model is: a system for cooling sinter and efficient sensible heat recovery and utilization, including: a stepping sintering machine only used for sintering mixed iron ore materials, and a stepping sintering machine for sintering The vertical cooling kiln for cooling the sintered ore is arranged between the discharge port of the stepping sintering machine and the feeding port of the vertical cooling kiln receiving funnel for feeding the output of the stepping sintering machine into the vertical The feeding mechanism of the vertical cooling kiln is connected to the gas outlet on the upper part of the vertical cooling kiln through pipelines. The gravity dust collector for dedusting the high-temperature flue gas discharged from the vertical cooling kiln and the The high-temperature flue gas unit for heating the high-temperature flue gas discharged from the cooling kiln, the unloader installed at the discharge port of the vertical cooling kiln, used to send the unloaded material from the unloader to the belt of the steelmaking mechanism Conveyor, the air inlet is connected to the vertical dual-pressure waste heat boiler for heat exchange at the air outlet of the gravity dust collector through pipelines, and the air outlet of the vertical double-pressure waste heat boiler is connected to an air inlet of the low-temperature gas unit , the air outlet of the low-temperature gas unit is connected to the air inlet at the lower part of the vertical cooling kiln through a pipeline, and the heat exchange tubes of the vertical double-pressure waste heat boiler for heat exchange with the high-temperature gas entering the furnace Connect the power generation system.

The feeding mechanism includes a trolley for receiving materials, and the trolley is arranged on the inclined bridge hoisting device for moving the trolley to the feed inlet of the vertical cooling kiln.

A dust unloader is arranged at the bottom of the gravity dust collector.

The stepping sintering machine includes: a mixed iron ore material inlet, a mixing bin for mixing the mixed iron ore materials, an ignition and holding furnace located at the mixed material outlet of the mixing bin, connected to The sintering section that is used to sinter the mixture coming out of the mixing bin on one side of the ignition and holding furnace, the dumper connected to the discharge port of the sintering section, and the dumper connected to the discharge port of the dumper for sintering The final sinter is crushed by a single-roll crusher, and the discharge port of the single-roll crusher constitutes a stepping sintering machine. The discharge port corresponds to the trolley.

The high-temperature flue gas unit includes: a high-temperature flue gas furnace, the air inlet at the lower part of the high-temperature flue gas furnace is connected to the natural gas inlet through an air intake pipeline, and the air intake pipeline is sequentially provided with the first A suction cold air valve and blower, the gas outlet on the upper part of the high-temperature flue gas furnace is connected to the gas outlet on the upper part of the vertical cooling kiln and the air inlet of the gravity dust collector through the gas outlet pipeline, and the gas outlet pipe There is a bypass valve on the road.

The low-temperature gas unit includes an electric precipitator connected to the gas outlet of the vertical double-pressure waste heat boiler, the gas outlet of the electrostatic precipitator is connected to a circulation fan through a pipeline, and the gas outlet of the circulation fan is connected to a pipeline through a pipeline. Divided into two paths, one path is connected to the air inlet of the low-temperature blower through a flue gas flow control valve, and the other path is connected to the exhaust chimney through a flue gas bypass valve, and the air inlet of the low-temperature blower is also passed through a second suction cold air valve The air inlet of the external air is connected, and the air outlet of the low-temperature blower is connected with the air inlet of the lower part of the vertical cooling kiln through a pipeline.

The power generation system includes: a medium-pressure steam condensation power generation system for driving the first generator and a low-pressure steam organic Rankine cycle power generation system for driving the second generator, and the medium-pressure steam condensation power generation system The high-temperature steam inlet end of the high-temperature steam is connected to the medium-pressure high-temperature steam outlet of the first heat exchange tube in the vertical double-pressure waste heat boiler for heat exchange with the high-temperature gas entering the furnace through a pipeline, and the low-pressure steam has an organic Lang The liquid inlet for generating low-pressure steam of the Ken cycle power generation system is connected to the liquid outlet of the third heat exchange tube in the vertical double-pressure waste heat boiler for heat exchange with the high-temperature gas entering the furnace, and the The outlet of exhausted steam after working in the medium-pressure steam condensing power generation system and the outlet of low-pressure low-temperature steam after heat exchange in the low-pressure steam organic Rankine cycle power generation system are connected through pipelines to the circulating water pump installed on the pipelines The liquid inlet end of the third heat exchange tube in the vertical double-pressure waste heat boiler is used for heat exchange with the high-temperature flue gas entering the furnace.

The medium-pressure steam condensation power generation system for driving the first generator includes: a medium-pressure steam drum for vapor-liquid separation, the steam outlet of the medium-pressure steam drum is connected to the vertical The inlet end of the first heat exchange tube used for heat exchange with the high-temperature gas entering the boiler in the dual-pressure waste heat boiler, and the high-temperature steam outlet of the first heat exchange tube is connected to the high-temperature steam of the condensing steam turbine through a pipeline At the steam inlet end, the power output end of the condensing steam turbine is connected to the first generator, and the exhaust steam outlet of the condensing steam turbine is connected to the first condenser arranged on the pipeline through the pipeline The inlet end of the circulating water pump, the inlet end of the medium-pressure high-temperature gas-liquid mixture of the medium-pressure steam drum is connected to the second heat exchange tube in the vertical dual-pressure waste heat boiler for heat exchange with the high-temperature gas entering the furnace The medium-pressure high-temperature gas-liquid mixing outlet, the high-temperature liquid outlet of the medium-pressure steam drum is connected to the high-temperature liquid inlet of the second heat exchange tube through a pipeline.

The low-pressure steam organic Rankine cycle power generation system for driving the second generator includes: a low-pressure steam drum, and the low-pressure low-temperature gas-liquid mixing inlet port of the low-pressure steam drum is connected to the vertical dual-pressure waste heat through a pipeline. The low-pressure low-temperature vapor-liquid mixing outlet of the third heat exchange tube used for heat exchange with the high-temperature gas entering the furnace in the boiler, and the outlet of the low-pressure steam drum’s low-temperature saturated steam is connected to the regenerative evaporator through a pipeline The inlet end of the low-pressure steam drum, the outlet end of the low-pressure low-temperature liquid is connected to the low-pressure low-temperature liquid of the second heat exchange tube in the vertical double-pressure waste heat boiler for heat exchange with the high-temperature gas entering the furnace The inlet end of the regenerative evaporator is connected to the inlet end of the circulating water pump through a pipeline and the third condenser arranged on the pipeline, and the gas of the heat exchange coil of the regenerative evaporator The outlet end of the liquid-mixed low-boiling organic working medium is connected to the inlet end of the gas-liquid separator through a pipeline, and the outlet end of the superheated organic working medium of the gas-liquid separator is connected to the inlet end of the screw expander through a pipeline. The outlet end of the liquid organic working medium of the gas-liquid separator is connected to an organic working medium inlet end of the liquid storage tank through a pipeline, the power output end of the screw expander is connected to the second generator, and the low-temperature organic working medium of the screw expander The outlet end of the liquid is connected to the other organic working medium inlet port of the liquid storage tank through the pipeline and the second condenser arranged on the pipeline, and the organic working medium outlet end of the liquid storage tank is connected through the pipeline and the low The boiling point working medium pump is connected to the inlet end of the low-temperature liquid organic working medium of the heat exchange coil of the regenerative evaporator.

The utility model is a system for sinter cooling and sensible heat efficient recovery and utilization, which can make sinter and cooling air flow in reverse in a closed space, prolong the cooling time of sinter, make heat exchange more sufficient, and greatly improve the thermal efficiency of the system , realizing the efficient recovery and utilization of sensible heat of sinter. The utility model has the following beneficial effects:

1. The sinter and cold air exchange heat in the closed vertical cooling kiln with small air-to-material ratio. The cooling time is long, more than 2 hours, the heat exchange is sufficient, and the temperature of the flue gas is greatly increased, which can be increased to about 470°C to realize the sensible heat of the sinter. Efficient recycling; avoiding the disadvantages of large air volume and large air leakage rate in the traditional cooling process system, it can reduce the cooling air supply by more than 65%, and reduce the power consumption of the system.

2. Part of the low-temperature flue gas after electrostatic precipitator is pressurized and returned to the air supply port of the vertical cooling kiln for recycling of sinter cooling air, which increases the average temperature of the cooling air supplied to the vertical cooling kiln by 30-50°C and improves the thermal efficiency of the system.

3. The online supplementary heat system is adopted, and the high-temperature flue gas produced by burning natural gas and blast furnace gas through the hot blast stove is supplemented to the flue gas system at the outlet of the vertical cold kiln, so as to adjust the relative stability of the high-temperature flue gas temperature and ensure the stability of the waste heat boiler steam production.

4. The high-temperature flue gas and circulating water are exchanged through the vertical double-pressure waste heat boiler to generate steam. The medium-pressure high-temperature superheated steam drives the condensing steam turbine to generate electricity. The low-pressure saturated steam exchanges heat with the low-boiling point organic working fluid in the regenerative evaporator. , the superheated and evaporated organic working medium drives the screw expander to generate electricity, and the sintering waste heat is more fully utilized to improve the waste heat utilization efficiency;

5. The high-temperature flue gas discharged from the vertical cold kiln passes through the gravity dust collector to separate the coarse powder, which can protect the waste heat double-pressure boiler behind, and the low-temperature flue gas discharged from the waste heat double-pressure boiler passes through the electric dust collector, which can prevent fine The entire system operates under a negative pressure of -3000Pa to prevent dust from being discharged, which is conducive to protecting the environment.

6. After the high-temperature flue gas is heat-exchanged in the waste heat boiler to generate steam, the temperature of the flue gas at the outlet can drop below 140°C. The amount of medium and low-pressure steam that can be recovered per ton of sinter waste heat is 109kg, and the power generation capacity of per ton of waste heat recovery is 21kWh, realizing sintering Sensible heat is efficiently recycled and utilized, and the equipment occupies less land and the maintenance workload is small, and the project investment recovery period is short, which has good promotion value and market prospect.

Description of drawings

Figure 1 is a schematic diagram of the overall composition of a system for cooling sinter and efficient recovery of sensible heat in the present invention;

Fig. 2 is a structural schematic diagram of the stepping sintering machine in the utility model.

in the picture

1: Vertical cooling kiln 2: Gravity dust collector

3: Vertical double-pressure waste heat boiler 4: Electrostatic precipitator

5: Circulation fan 6: Smoke exhaust chimney

7: Medium pressure steam drum 8: Low pressure steam drum

9: Receiving funnel 10: Condensing steam turbine

11: The first generator 12: The first condenser

13: Circulating water pump 14: Regenerative evaporator

15: Gas-liquid separator 16: Screw expander

17: Second generator 18: Second condenser

19: Liquid storage tank 20: Low boiling point working fluid pump

21: The third condenser 22: High temperature flue gas furnace

23: The first suction cold air valve 24: High temperature blower

25: Bypass valve 26: Ash unloader

27: Flue gas flow control valve 28: Flue gas bypass valve

29: Stepping sintering machine 30: Inclined bridge hoisting device

31: Trolley 32: Unloader

33: Belt conveyor 34: First heat exchange tube

35: Second heat exchange tube 36: Third heat exchange tube

37: Natural gas inlet 38: Cryogenic blower

39: Second air suction valve 40: Air inlet

detailed description

A system for sinter cooling and sensible heat efficient recovery and utilization of the present utility model will be described in detail below in combination with embodiments and drawings.

As shown in Figure 1, a system for sinter cooling and sensible heat efficient recovery and utilization of the utility model includes: a stepping sintering machine 29 only used for sintering mixed iron ore materials, and a stepping sintering machine for sintering The vertical cooling kiln 1 that cools the sintered cake is arranged between the discharge port of the stepping sintering machine 29 and the feed port of the vertical cooling kiln 1 receiving funnel 9 for the stepping sintering machine 29 The material is sent to the feeding mechanism of the vertical cooling kiln 1, and the gravity dust removal for dedusting the high-temperature flue gas discharged from the vertical cooling kiln 1 is connected to the gas outlet on the upper part of the vertical cooling kiln 1 through pipelines. device 2 and a high-temperature flue gas unit for heating the high-temperature flue gas discharged from the vertical cooling kiln 1, and an unloader 32 arranged at the discharge port of the vertical cooling kiln 1 for unloading The material unloaded by the machine 32 is sent to the belt conveyor 33 of the steelmaking mechanism, and the air inlet is connected to the vertical dual-pressure waste heat boiler 3 for heat exchange at the gas outlet of the gravity dust collector 2 through a pipeline. The air outlet of the dual-pressure waste heat boiler 3 is connected to an air inlet of the low-temperature gas unit, and the air outlet of the low-temperature gas unit is connected to the air inlet of the lower part of the vertical cooling kiln 1 through a pipeline. The vertical double-pressure waste heat boiler 3 The heat exchange tubes used for heat exchange with the high-temperature gas entering the furnace are connected to the power generation system.

Wherein, the feeding mechanism includes a trolley 31 for receiving materials, and the trolley 31 is arranged on the inclined bridge hoisting device 30 for transferring the trolley 31 to the feed port of the vertical cooling kiln 1 superior. The car body of the trolley 31 adopts a sandwich insulation structure, which effectively reduces heat dissipation during operation. The hoisting device 30 of the inclined bridge adopts a hydraulic trolley confidential discharge method, which shortens the turning cycle of the trolley, within 100s.

The gravity dust collector 2 is used for gravity dust removal and coarse powder separation, and an ash unloader 26 is arranged at the bottom to protect the vertical dual-pressure waste heat boiler 3 connected behind. The vertical cooling kiln 1 adopts a fully-sealed vertical tank-type kiln structure, the outer wall is a steel structure cylinder, and the inner liner is a composite thermal insulation material. The sinter and cold air exchange heat in the kiln countercurrently, and the cooling time is long, more than 2 hours. The small air-to-material ratio is sufficient for heat exchange, avoiding the disadvantages of large air volume and large air leakage rate in the traditional cooling process system, and the cooling air supply volume can be reduced by more than 65%.

The high-temperature flue gas unit includes: a high-temperature flue gas furnace 22, the air inlet 221 at the lower part of the high-temperature flue gas furnace 22 is connected to the natural gas inlet 37 through an air intake pipeline, and the flow direction of the natural gas on the air intake pipeline is A first cold suction valve 23 and a blower 24 are provided in sequence, and the gas outlet 222 on the upper part of the high-temperature flue gas furnace 22 is connected to the gas outlet on the upper part of the vertical cooling kiln 1 and the gravity dust collector 2 through an outlet pipeline. On the air inlet, a bypass valve 25 is set on the outlet pipeline.

In the high-temperature flue gas unit, the high-temperature flue gas is produced by burning blast furnace gas and other fuels in the high-temperature flue gas furnace 22, and is replenished into the flue gas system at the outlet of the vertical cooling kiln 1 through the bypass valve 25 to ensure that it enters the vertical double-pressure The flue gas temperature of the waste heat boiler 3 is relatively stable and the vertical double-pressure waste heat boiler 3 produces stable steam production.

The cold air and sinter exchange heat in countercurrent in the vertical cooling kiln. The flue gas temperature at the kiln outlet of the vertical cooling kiln is 390-420°C. After heat exchange, the high-temperature flue gas is first dedusted by gravity dust collector 2, and the dust is dedusted by gravity The ash unloader 26 below the dust collector is discharged, and then passed into the vertical double-pressure waste heat boiler 3. The temperature of the low-temperature flue gas after heat exchange is less than 140°C. Through the flue gas bypass valve 28, it is discharged into the atmosphere from the exhaust chimney 6, or enters the high-temperature flue gas unit through the flue gas flow control valve, and then introduced into the vertical cooling kiln 1 by the low-temperature blower 38 to complete the high-temperature flue gas cycle .

The low-temperature gas unit includes an electric precipitator 4 connected to the gas outlet of the vertical double-pressure waste heat boiler 3. The electric precipitator can prevent the discharge of fine powder, and the gas outlet of the electric precipitator 4 is connected to a circulating fan through a pipeline. 5. The air outlet of the circulating fan 5 is divided into two paths through the pipeline, one path is connected to the air inlet of the low-temperature blower 38 through a flue gas flow control valve 27, and the other path is connected to the smoke exhaust chimney 6 through a flue gas bypass valve 28 , the air inlet of the low-temperature blower 38 is also connected to the external air inlet 40 through a second suction cold air valve 39, and the air outlet of the low-temperature blower 38 is connected to the air inlet at the bottom of the vertical cooling kiln 1 through a pipeline. mouth.

Part of the low-temperature flue gas after electrostatic precipitator is pressurized and returned to the vertical cooling kiln 1 air supply port through the flue gas flow control valve 27 for recycling of sinter cooling air, so that the average temperature of the cooling air supplied to the vertical cooling kiln is increased by 30-50 ℃ to improve the thermal efficiency of the system.

The power generation system includes: a medium-pressure steam condensation power generation system for driving the first generator 11 and a low-pressure steam organic Rankine cycle power generation system for driving the second generator 17, the medium-pressure steam condensation The high-temperature steam inlet end of the power generation system is connected to the medium-pressure high-temperature steam outlet of the first heat exchange tube 34 in the vertical dual-pressure waste heat boiler 3 for heat exchange with the high-temperature gas entering the furnace through a pipeline. The liquid inlet for generating low-pressure steam of the low-pressure steam organic Rankine cycle power generation system is connected to the outlet of the third heat exchange tube 36 in the vertical double-pressure waste heat boiler 3 for heat exchange with the high-temperature gas entering the furnace. At the liquid port end, the exhaust steam outlet of the medium-pressure steam condensation power generation system after work and the low-pressure low-temperature steam outlet of the low-pressure steam organic Rankine cycle power generation system after heat exchange are both passed through the pipeline and arranged in the The circulating water pump 13 on the pipeline is connected to the liquid inlet end of the third heat exchange pipe 36 in the vertical dual-pressure waste heat boiler 3 for heat exchange with the high-temperature flue gas entering the furnace.

The medium-pressure steam condensation power generation system for driving the first generator 11 includes: a medium-pressure steam drum 7 for vapor-liquid separation, and the medium-pressure steam drum 7 generates high-temperature superheating at 2.05MPa and about 400°C steam. The steam outlet of the medium-pressure steam drum 7 is connected to the inlet end of the first heat exchange tube 34 in the vertical dual-pressure waste heat boiler 3 for heat exchange with the high-temperature gas entering the furnace through a pipeline. The high-temperature steam outlet of the first heat exchange tube 34 is connected to the high-temperature steam inlet port of the condensing steam turbine 10 through a pipeline, and the power output end of the condensing steam turbine 10 is connected to the first generator 11. After the steam turbine 10 has done work, the exhaust steam outlet is connected to the inlet of the circulating water pump 13 through the pipeline and the first condenser 12 arranged on the pipeline, and the medium-pressure high-temperature gas-liquid mixing inlet of the medium-pressure steam drum 7 is connected to The medium-pressure high-temperature gas-liquid mixing outlet end of the second heat exchange tube 35 used for heat exchange with the high-temperature gas entering the furnace in the vertical double-pressure waste heat boiler 3, and the high-temperature liquid outlet end of the medium-pressure steam drum 7 The end is connected to the high-temperature liquid inlet end of the second heat exchange tube 35 through a pipeline.

In the medium-pressure steam condensing power generation system, the circulating water absorbs heat in the vertical double-pressure waste heat boiler 3 to generate steam, and the high-temperature superheated steam in the medium-pressure steam drum 7 enters the condensing steam turbine 10 to drive the first generator 11 to generate electricity. The exhausted steam after doing work enters the first condenser 12 to condense, and the condensed water is sent to the vertical dual-pressure waste heat boiler 3 by the circulating water pump 13 to complete the thermodynamic cycle.

The low-pressure steam organic Rankine cycle power generation system for driving the second generator 17 includes: a low-pressure steam drum 8 that generates low-temperature saturated steam at 0.4MPa and about 140°C. The low-pressure and low-temperature vapor-liquid mixing inlet port of the low-pressure steam drum 8 is connected to the low-pressure and low-temperature heat transfer tube 36 of the third heat exchange tube 36 in the vertical dual-pressure waste heat boiler 3 for heat exchange with the high-temperature gas entering the furnace through a pipeline. Vapor-liquid mixing outlet, the outlet of the low-temperature saturated steam of the low-pressure steam drum 8 is connected to the inlet port of the regenerative evaporator 14 through a pipeline, and the outlet of the low-pressure and low-temperature liquid of the low-pressure steam drum 8 is connected to the The low-pressure low-temperature liquid inlet end of the second heat exchange tube 35 used for heat exchange with the high-temperature gas entering the furnace in the vertical dual-pressure waste heat boiler 3, the gas outlet end of the regenerative evaporator 14 passes through the pipeline The inlet end of the circulating water pump 13 is connected with the third condenser 21 arranged on the pipeline, and the outlet end of the gas-liquid mixed low boiling point organic working medium of the heat exchange coil of the heat storage evaporator 14 is connected through a pipeline The inlet end of the gas-liquid separator 15, the outlet end of the superheated organic working medium of the gas-liquid separator 15 is connected to the inlet end of the screw expander 16 through a pipeline, and the outlet of the liquid organic working medium of the gas-liquid separator 15 end is connected to an organic working medium inlet port of the liquid storage tank 19 through a pipeline, the power output end of the screw expander 16 is connected to the second generator 17, and the low-temperature organic working medium outlet end of the screw expander 16 is passed through a pipeline The second condenser 18 arranged on the pipeline is connected to another organic working medium inlet port of the liquid storage tank 19, and the organic working medium outlet end of the liquid storage tank 19 passes through the pipeline and the low boiling point working medium arranged on the pipeline The pump 20 is connected to the inlet end of the low-temperature liquid organic working medium of the heat exchange coil of the heat storage evaporator 14 .

In the low-pressure steam organic Rankine cycle power generation system, the low-temperature saturated steam in the low-pressure steam drum 8 is passed into the regenerative evaporator 14, and the organic working medium after absorbing heat enters the gas-liquid separator 15, and after separation The superheated organic working medium is passed into the screw expander 16 to drive the second generator 17 to generate electricity. The organic working medium after doing work enters the second condenser 18, and the condensed liquid organic working medium enters the liquid storage tank 19. The liquid working medium in the liquid separator also flows into the liquid storage tank 19, and finally the liquid organic working medium is sent back to the regenerative evaporator 14 by the low boiling point working medium pump 20 to complete the organic Rankine cycle; 14 The low-pressure and low-temperature steam after heat exchange enters the third condenser 21, and the condensed water is sent back to the vertical dual-pressure waste heat boiler 3 by the circulating water pump 13 to complete the thermodynamic cycle.

Through the low-pressure steam organic Rankine cycle power generation system and the low-pressure steam organic Rankine cycle power generation system, 109kg of medium and low-pressure steam can be recovered per ton of sinter waste heat, and 21kWh of power generation per ton of sinter waste heat can be recovered, realizing efficient recovery and utilization of sinter sensible heat .

The high-temperature flue gas discharged from the vertical cold kiln passes through the gravity dust collector to separate the coarse powder, which can protect the waste heat double-pressure boiler behind, and the low-temperature flue gas discharged from the waste heat double-pressure boiler passes through the electric dust collector, which can prevent the discharge of fine powder , The whole system operates under the negative pressure of -3000Pa, which prevents the dust from being discharged, which is beneficial to protect the environment.

As shown in Figure 2, the stepping sintering machine 29 includes: a mixed iron ore feed inlet 291, a mixing bin 292 for mixing the mixed iron ore, and the mixture located in the mixing bin 292 The ignition and holding furnace 293 at the material outlet is connected to the sintering section 294 on the side of the ignition and holding furnace 293 for sintering the mixed material coming out from the mixing bin 292, and the overturning section connected to the outlet of the sintering section 294 machine 295, which is connected to the discharge port of the dumper 295 and is used to crush the sintered cake after sintering. The discharge port 297 of the single roll crusher 296 constitutes the outlet of the stepping sintering machine The feed opening corresponds to the trolley 31 described above. Compared with the traditional sintering machine that includes a sintering section and a cooling section, the walking sintering machine 29 of the present invention has only a longer sintering section 294, and the sintering output can be increased by 50%; the hot sintered discus is broken by a single roll crusher 296, After the sintered discus is crushed, the particle size is less than 150mm, and the average temperature after crushing is 600°C, and then it is unloaded into the trolley 31, and then transported to the receiving hopper 9 by the inclined bridge hoisting device 30.

Claims (9)

1. one kind utilizes system for sintering deposit cooling and sensible heat high efficiente callback, it is characterised in that include: be served only for mixing Stepping sintering machine (29) that iron mine material is sintered, for the vertical cooling kiln that the sintering deposit after sintering crushing is cooled down (1) use, it is arranged between discharging opening and the charging aperture of vertical cooling kiln (1) receiving cone (9) of described stepping sintering machine (29) In the feed mechanism by the discharging vertical cooling kiln (1) of feeding of stepping sintering machine (29), it is connected to described perpendicular respectively by pipeline The gravity being used for carrying out the high-temperature flue gas discharged from vertical cooling kiln (1) dedusting of the gas outlet on formula cooling kiln (1) top removes Dirt device (2) and for the high-temperature flue gas unit of heating the high-temperature flue gas discharged from vertical cooling kiln (1), is arranged on described The unloader (32) of vertical cooling kiln (1) discharge outlet, the belt of steel-making mechanism sent into by the material for being unloaded by unloader (32) Transporter (33), air inlet is connected to the vertical double pressures for heat exchange of described gravitational precipitator (2) gas outlet by pipeline Waste heat boiler (3), the gas outlet of described vertical pair of pressure waste heat boiler (3) connects an air inlet of cryogenic gas unit, described The gas outlet of cryogenic gas unit is connected the air inlet of vertical cooling kiln (1) bottom, described vertical double pressure waste heats by pipeline The heat exchange heat exchanger tube being used for carrying out heat exchange with the high-temperature gas entered in stove of boiler (3) is connected electricity generation system.

One the most according to claim 1 utilizes system for sintering deposit cooling and sensible heat high efficiente callback, it is characterised in that Described feed mechanism includes the chassis (31) for splicing, and described chassis (31) is arranged on for being transferred by chassis (31) On the skew bridge winding plant (30) of described vertical cooling kiln (1) charging aperture.

One the most according to claim 1 utilizes system for sintering deposit cooling and sensible heat high efficiente callback, it is characterised in that Described gravitational precipitator (2) bottom is provided with discharge apparatus (26).

One the most according to claim 1 utilizes system for sintering deposit cooling and sensible heat high efficiente callback, it is characterised in that Described stepping sintering machine (29) includes: mixing iron mine material charging aperture (291), for mixing mixing iron mine material Blending bunker (292), be positioned at the ignition holding furnace (293) of the compound discharging opening of described blending bunker (292), be connected to a little Fire holding furnace (293) side, for the sintering stage (294) being sintered from blending bunker (292) compound out, connects At the tippler (295) of the discharging opening of described sintering stage (294), it is connected to described tippler (295) discharging opening for sintering After sintering deposit carry out the single roll crusher (296) pulverized, the discharging opening (297) of described single roll crusher (296) constitutes stepping The chassis (31) described in discharging opening correspondence of sintering machine (29).

One the most according to claim 1 utilizes system for sintering deposit cooling and sensible heat high efficiente callback, it is characterised in that Described high-temperature flue gas unit includes: high-temperature flue gas stove (22), and the air inlet (221) of described high-temperature flue gas stove (22) bottom leads to Cross air inlet pipeline and connect natural gas air inlet (37), described air inlet pipeline is disposed with the first suction by the flow direction of natural gas Cold blast sliding valve (23) and aerator (24), the gas outlet (222) on described high-temperature flue gas stove (22) top is connected by outlet pipe On the described vertical gas outlet on cooling kiln (1) top and the air inlet of described gravitational precipitator (2), on described outlet pipe It is provided with bypass valve (25).

One the most according to claim 1 utilizes system for sintering deposit cooling and sensible heat high efficiente callback, it is characterised in that Described cryogenic gas unit includes the electric cleaner (4) being connected to described vertical pair of pressure waste heat boiler (3) gas outlet, described The gas outlet of electric cleaner (4) connects circulating fan (5) by pipeline, and the gas outlet of described circulating fan (5) is divided by pipeline Two-way, the smoke flow control valve (27) that leads up to connects the air inlet of low temperature blower (38), separately leads up to one Flue gas bypass valve (28) connects chimney (6), and the air inlet of described low temperature blower (38) inhales cold wind also by one second Valve (39) connects extraneous air air inlet (40), and the gas outlet of described low temperature blower (38) connects described vertical cold by pipeline But the air inlet of kiln (1) bottom.

One the most according to claim 1 utilizes system for sintering deposit cooling and sensible heat high efficiente callback, it is characterised in that Described electricity generation system includes: for driving the middle pressure steam condensing electricity generation system of the first electromotor (11) and for driving the The low-pressure steam organic Rankine cycle power generation system of two electromotors (17), the high-temperature steam of medium pressure steam condensing electricity generation system Admission end is connected in described vertical pair of pressure waste heat boiler (3) for carrying out heat exchange with the high-temperature gas entered in stove by pipeline The middle super pressure-high temperature steam (vapor) outlet of the first heat exchanger tube (34), being used for of described low-pressure steam organic Rankine cycle power generation system produces The inlet of low-pressure steam connects in described vertical pair of pressure waste heat boiler (3) for carrying out heat friendship with the high-temperature gas entered in stove The liquid outlet end of the 3rd heat exchanger tube (36) changed, exhaust steam venthole after the acting of medium pressure steam condensing electricity generation system and low Low-pressure low-temperature Vapor outlet after pressure steam organic Rankine cycle power generation system heat exchange is all by pipeline with described in being arranged on Water circulating pump (13) on pipeline connects in described vertical pair of pressure waste heat boiler (3) for carrying out with the high-temperature flue gas entered in stove The inlet end of the 3rd heat exchanger tube (36) of heat exchange.

One the most according to claim 7 utilizes system for sintering deposit cooling and sensible heat high efficiente callback, it is characterised in that The described middle pressure steam condensing electricity generation system for driving the first electromotor (11) includes: for carrying out in vapor-liquid separation Pressure drum (7), the venthole of medium pressure drum (7) by pipeline connect in described vertical pair of pressure waste heat boiler (3) be used for Enter the arrival end that the high-temperature gas in stove carries out first heat exchanger tube (34) of heat exchange, the high temperature of described first heat exchanger tube (34) Steam (vapor) outlet connects the high-temperature steam air intake end of condensing turbine (10) by pipeline, described condensing turbine (10) Power take-off connects the first electromotor (11), the exhaust steam venthole after described condensing turbine (10) acting by pipeline and The first condenser (12) being arranged on pipeline connects the arrival end of water circulating pump (13), the middle pressure height of medium pressure drum (7) Temperature vapour-liquid mixing entrance point connects in described vertical pair of pressure waste heat boiler (3) for carrying out heat friendship with the high-temperature gas entered in stove The middle super pressure-high temperature vapour-liquid mixed export end of the second heat exchanger tube (35) changed, the high-temp liquid port of export of medium pressure drum (7) leads to Cross pipeline and connect the high-temp liquid inlet end of described second heat exchanger tube (35).

One the most according to claim 7 utilizes system for sintering deposit cooling and sensible heat high efficiente callback, it is characterised in that The described low-pressure steam organic Rankine cycle power generation system for driving the second electromotor (17) includes: low-pressure drum (8), The low-pressure low-temperature vapour-liquid mixing arrival end of described low-pressure drum (8) is connected in described vertical pair of pressure waste heat boiler (3) by pipeline The low-pressure low-temperature vapour-liquid mixed export end of the 3rd heat exchanger tube (36) for carrying out heat exchange with the high-temperature gas entered in stove, institute The port of export of the low-temperature saturated steam stating low-pressure drum (8) connects the inlet port of heat accumulating type vaporizer (14), institute by pipeline The port of export described vertical pair of pressure waste heat boiler (3) of connection of the low pressure, low temperature liquid stating low-pressure drum (8) is used for and enters stove Interior high-temperature gas carries out the low pressure, low temperature liquid arrival end of second heat exchanger tube (35) of heat exchange, described heat accumulating type vaporizer (14) outlet port connects entering of described water circulating pump (13) by pipeline and the 3rd condenser (21) being arranged on pipeline Mouth end, the port of export of the gas-liquid mixed low boiling organic working medium of the heat exchange coil of described heat accumulating type vaporizer (14) is by pipeline even Connecing the entrance point of gas-liquid separator (15), the overheated organic working medium port of export of described gas-liquid separator (15) connects spiral shell by pipeline The inlet port of bar decompressor (16), the liquid organic working medium port of export of described gas-liquid separator (15) connects liquid storage by pipeline One organic working medium entrance point of tank (19), the power take-off of described screw expander (16) connects the second electromotor (17), The low temperature organic working medium port of export of described screw expander (16) is by pipeline and the second condenser (18) being arranged on pipeline Connect another organic working medium entrance point of fluid reservoir (19), the organic working medium port of export of described fluid reservoir (19) by pipeline and The low temperature liquid of the heat exchange coil that the low boiling working fluid pump (20) being arranged on pipeline connects described heat accumulating type vaporizer (14) has Machine working medium arrival end.