Sintering waste heat comprehensive utilization system

Abstract

A sintering waste heat comprehensive utilization system comprises a large flue waste heat boiler, a heat exchanger section B, a heat exchanger section A, a circular cooler and an ORC generator. A smoke outlet of the large flue waste heat boiler is connected with a gas inlet of the section B of the heat exchanger; the heat exchanger B section air outlet is connected with the heat exchanger A section air inlet; the heat exchanger section A gas outlet is connected with a flue gas purification system; a water outlet of the ORC generator sequentially penetrates through the heat exchanger section A and the heat exchanger section B through a heat exchange pipeline and then is connected with an air inlet of the ORC generator. A waste heat boiler is arranged above the annular cooler, and a branch pipeline on the heat exchange pipeline between a water outlet of the ORC generator and the section A of the heat exchanger penetrates through the waste heat boiler on the annular cooler and then is connected with an air inlet of the ORC generator. Through two-stage hot water heat exchange, the flue gas temperature at the inlet of the purification system is reduced. The waste heat of the sintering large flue, the flue gas at the activated carbon inlet and the flue gas at the middle-rear section of the circular cooler is utilized, and an ORC power generation mode is adopted, so that the self-power-generation rate of the sintering system is increased, and the operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to a waste heat utilization system, in particular to a sintering waste heat comprehensive utilization system, belonging to the technical field of steel metallurgy sintering. Background Art

[0002] In the existing technology, with the advancement of thick material layer sintering technology and sintering machine sealing technology, the tail flue gas temperature of the sintering flue is constantly increasing. The flue gas temperature of the 4 to 6 wind boxes at the tail of most sintering devices has increased from about 300°C to 400°C to 450°C. The average flue gas temperature at the outlet of the sintering flue has also increased from 140 to 150°C to 180°C to 200°C. The high-temperature flue gases generated need to be purified, such as desulfurization. In the existing technology, some activated carbon is used as a flue gas purification process. Since activated carbon is a flammable substance, the temperature control entering the adsorption tower cannot be higher than 135°C. Simply using ordinary sintering flue boilers to produce steam and cool down can reduce the temperature by about 30°C to 40°C at most. If the flue gas temperature is as high as 180°C to 200°C, the single sintering flue waste heat boiler can not reach the ideal temperature. Therefore, it is necessary to cool the flue gas, and the flue gas temperature of the flue can be utilized during the cooling process. At present, the cooling method is generally through supplementary cold air or air-cooled heat exchanger, which is not energy-saving and cannot generate any benefits. At the same time, due to the low flue gas temperature of the air-cooled heat exchanger, it is very easy to produce low-temperature corrosion, which will affect the normal operation of the activated carbon process after failure. Therefore, the waste heat resources need to be fully utilized to reduce energy consumption.

[0003] In the prior art, the flue gas in the large flue enters the flue gas-air heat exchanger after coming out of the desulfurization booster fan, and the blower is used to blow air to cool the flue gas. In order to ensure that the flue gas purification system can still operate normally (the flue gas temperature is not higher than 135°C) when the flue gas-air heat exchanger fails, a cold air valve is installed on the flue between the main exhaust fan and the flue gas mixer as a backup flue gas cooling measure. However, the waste heat of these flue gases is not effectively utilized, resulting in waste heat resources. At the same time, the 320m 2 The air intake system of the waste heat boiler of the sintering ring cooler is divided into two sections. The first section of high-temperature exhaust gas directly enters the high-parameter 1 section of the waste heat boiler arranged on the machine from the wind hood, and the second section of medium-temperature exhaust gas directly enters the high-parameter 2 section of the waste heat boiler arranged on the machine from the wind hood. The exhaust gas of the high-parameter 1 section of the boiler and the high-parameter 2 section of the exhaust gas are combined and enter the low-parameter section of the waste heat boiler (external), and pass through the low-parameter section of the low-parameter section of the low-pressure superheater, high-parameter economizer, low-pressure evaporator, and condensate heater. The current scope of waste heat utilization of the ring cooler is usually the middle and front sections of the ring cooler (about the first 40% to 45%). However, the waste heat resources in the middle and rear sections of the ring cooler (the flue gas temperature is generally lower than 250°C) are basically not effectively utilized.

[0004] Chinese patent CN207006100U discloses a system for comprehensive utilization of waste heat of flue gas from an annular cooler and flue gas from a sintering flue, the device includes a waste heat recovery device in the front area of ​​an annular cooler, a low-pressure drum and a high-pressure drum, the waste heat recovery device in the front area of ​​annular cooler includes a heat exchange device, the heat exchange device includes a box body and a high-pressure superheater, a high-pressure evaporator, a low-pressure superheater, a high-pressure economizer, a low-pressure evaporator and a low-pressure economizer arranged in the box body. The waste heat of high-temperature flue gas in the sintering flue and the waste heat of the waste gas after the sintering ore of the annular cooler are recovered, and the waste heat of low-temperature waste gas in the third area of ​​the annular cooler is utilized, and the waste heat of high-temperature flue gas in the sintering flue and the waste heat of the waste gas after the sintering ore of the annular cooler are combined to generate electricity. In this patent, only the waste heat of low-temperature exhaust gas in the third zone of the annular cooler (i.e., the waste heat of the flue gas in the middle section) is used, and the waste heat resources in the rear section of the annular cooler are not used. At the same time, the generated steam-water mixture needs to be self-deoxidized and steam-water separated in the low-pressure drum and deaerator before being sent to the steam turbine to work. This process is cumbersome. The flue gas in the large flue only undergoes a single-stage heat exchange, and the flue gas in the large flue is not effectively utilized in the subsequent process, resulting in a waste of resources. Utility Model Content

[0005] According to the purpose of the utility model, a sintering waste heat comprehensive utilization device with strong adaptability and the ability to improve waste heat utilization rate is provided. The device provided by the utility model, first, uses a two-stage heat exchanger to exchange the flue gas waste heat generated at the tail end of the sintering flue with the power generation water of the ORC generator in two stages of hot water. After the heat exchange is completed, it enters the ORC generator to do work, and the flue gas temperature after the heat exchange is completed is below 135°C, which minimizes the flue gas temperature entering the flue gas purification system and ensures the safe operation of subsequent systems. Secondly, the waste heat resources in the middle and rear sections of the ring cooler (the flue gas temperature is generally below 250°C) are used to heat the power generation water of the ORC generator, effectively utilizing the waste heat resources of the ring cooler. The utility model effectively improves the utilization of waste heat resources through a separate heat exchange circuit and improves the work efficiency of the ORC generator.

[0006] According to the implementation scheme of the utility model, a sintering waste heat comprehensive utilization system is provided.

[0007] A sintering waste heat comprehensive utilization system, the system includes a large flue waste heat boiler, a heat exchanger section B, a heat exchanger section A, a ring cooler, and an ORC generator. The flue gas outlet of the large flue waste heat boiler is connected to the air inlet of the heat exchanger section B. The air outlet of the heat exchanger section B is connected to the air inlet of the heat exchanger section A. The air outlet of the heat exchanger section A is connected to the flue gas purification system. The water outlet of the ORC generator passes through the interior of the heat exchanger section A and the heat exchanger section B in sequence through a heat exchange pipe, and then is connected to the air inlet of the ORC generator. A waste heat boiler is arranged above the ring cooler, and a pipe is branched from the heat exchange pipe between the water outlet of the ORC generator and the heat exchanger section A, and then passes through the waste heat boiler on the ring cooler and is connected to the air inlet of the ORC generator.

[0008] In the present utility model, the heat exchanger section B includes a first heat exchanger section B and a second heat exchanger section B. The heat exchanger section A includes a first heat exchanger section A and a second heat exchanger section A. The air inlets of the first heat exchanger section B and the second heat exchanger section B are both connected to the air outlet of the large flue waste heat boiler. The air outlet of the first heat exchanger section B is connected to the air inlet of the first heat exchanger section A through a first pipe. The air outlet of the second heat exchanger section B is connected to the air inlet of the second heat exchanger section A through a second pipe.

[0009] In the utility model, the water outlet of the ORC generator is connected to a heat exchange pipe. The heat exchange pipe is divided into a third pipe and a fourth pipe. The third pipe passes through the interior of the first heat exchanger section A and the first heat exchanger section B in sequence and is connected to the air inlet of the ORC generator. The fourth pipe passes through the interior of the second heat exchanger section A and the second heat exchanger section B in sequence and is connected to the air inlet of the ORC generator.

[0010] In the utility model, a circulating water pump is also arranged on the heat exchange pipeline.

[0011] In the utility model, the annular cooler includes a hot water heater section 1 and a hot water heater section 2. Along the material flow, the hot water heater section 2 and the hot water heater section 1 are sequentially arranged above the middle and rear sections of the annular cooler. The heat exchange pipeline branches out a fifth pipeline which passes through the interior of the hot water heater section 1 and the hot water heater section 2 in sequence and is then connected to the air inlet of the ORC generator.

[0012] In the utility model, the connection points between the hot water heater section 1 and the hot water heater section 2 and the ring cooler are both provided with gate valves.

[0013] In the utility model, a first ring cooling fan and a second ring cooling fan are arranged below the middle and rear sections of the ring cooling machine.

[0014] In the present invention, a first ring cooling fan is arranged below the ring cooling machine located at the second stage of the hot water heater. A second ring cooling fan is arranged below the ring cooling machine located at the first stage of the hot water heater.

[0015] In the present invention, the large flue waste heat boiler includes a first large flue waste heat boiler and a second large flue waste heat boiler. The air outlet of the first large flue waste heat boiler is connected to the air inlet of the first heat exchanger section B. The air outlet of the second large flue waste heat boiler is connected to the air inlet of the second heat exchanger section B.

[0016] In the utility model, the system further comprises a first dust collector, a second dust collector, a first main exhaust fan, and a second main exhaust fan. Along the direction of the flue gas, the first dust collector and the first main exhaust fan are sequentially arranged on the first pipeline. Along the direction of the flue gas, the second dust collector and the second main exhaust fan are sequentially arranged on the second pipeline.

[0017] In the utility model, the system also includes a smoke mixer. The first pipe and the second pipe are both connected to the air inlet of the smoke mixer. The smoke outlet of the smoke mixer is connected to the air inlet of the first heat exchanger section A and the second heat exchanger section A through the sixth smoke pipe and the seventh smoke pipe respectively.

[0018] In the present invention, the system further comprises a first desulfurization supercharger and a second desulfurization supercharger. Along the direction of the flue gas, the first desulfurization supercharger is arranged on the sixth flue gas duct. The second desulfurization supercharger is arranged on the seventh flue gas duct.

[0019] In the utility model, the system further comprises a first muffler, a first supplementary cold air valve, a second muffler, and a second supplementary cold air valve. The first muffler is arranged above the first supplementary cold air valve. The air outlet of the first supplementary cold air valve is connected to the first pipe. The second muffler is arranged above the second supplementary cold air valve. The air outlet of the second supplementary cold air valve is connected to the second pipe.

[0020] The utility model arranges the waste heat boiler and heat exchanger of the sintering machine flue at 4 to 6 wind boxes at the tail of the sintering flue. The average flue gas temperature is 180℃ to 200℃. After the flue gas of the sintering flue is heat exchanged, the flue gas temperature entering the flue gas purification system is guaranteed to be no higher than 135℃. The water source of the hot water heat exchanger for power generation entering the heat exchanger and the ring cooler is 80℃ circulating hot water. After passing through the heat exchanger and the ring cooler, the temperature is increased to 150℃ and finally sent to the ORC generator set for power generation. After heat exchange, the water temperature is reduced to 80℃ and then sent to the heat exchanger and the ring cooler through the circulation pump, forming multiple complete water heat exchange circulation lines for power generation.

[0021] In the utility model, the heat exchanger can be a hot water heat exchanger for ORC, but is not limited to a hot water heat exchanger for ORC, and can be a plate heat exchanger, a floating head heat exchanger, an interval heat exchanger, etc. The sintering waste heat comprehensive utilization device includes two hot water heat exchange lines for ORC generators, but is not limited to two. The number of hot water heat exchange lines for ORC can be specified according to the increase in the available devices for flue gas waste heat. The device includes a large flue waste heat boiler, a heat exchanger section B, a heat exchanger section A, a ring cooler, and an ORC generator. Among them, the direction of the flue gas passes through the large flue waste heat boiler, the heat exchanger section B, the heat exchanger section A, and then is sent to the flue gas purification system through the outlet of the heat exchanger section A. The purpose of setting the heat exchanger section B and the heat exchanger section A is to ensure that the flue gas temperature entering the flue gas purification system is not higher than 135°C, so as to ensure that the flue gas purification system can still operate normally. The first line is the hot water heat exchange line for the ORC generator. The water outlet of the ORC generator passes through the heat exchange pipe in turn through the inside of the heat exchanger section A and the heat exchanger section B, and then is connected to the air inlet of the ORC generator. The second line is a fifth pipe branched from the heat exchange pipe, which passes through the heating section of the ring cooler (the waste heat resource in the middle and rear sections of the ring cooler) and is connected to the air inlet of the ORC generator. Among them, a circulating water pump is also added to the heat exchange pipe to improve the hot water circulation efficiency after the ORC generator works. The water used for ORC power generation is heat exchanged through multiple lines. The temperature of the water vapor entering the air inlet of the ORC generator after heat exchange through the heat exchanger and the ring cooler is about 150°C, which ensures the work efficiency of ORC power generation. At the same time, on the one hand, the flue gas temperature entering the flue gas purification system is reduced, and on the other hand, the same set of ORC power generation system is used for the sintering flue gas and the waste heat in the middle and rear sections of the ring cooler, which minimizes the investment cost, operation cost and land resources of the ORC power generation system.

[0022] In the utility model, the system includes a first large flue waste heat boiler, a second large flue waste heat boiler, a first heat exchanger section B, a second heat exchanger section B, a first heat exchanger section A, and a second heat exchanger section A. The circuit in the sintering large flue is divided into two, the air outlet of the first large flue waste heat boiler is connected to the air inlet of the first heat exchanger section B, and the air outlet of the second large flue waste heat boiler is connected to the air inlet of the second heat exchanger section B. Among them, the air outlet of the first heat exchanger section B is connected to the air inlet of the first heat exchanger section A through the first pipe, and the air outlet of the second heat exchanger section B is connected to the air inlet of the second heat exchanger section A through the second pipe. Among them, the heat exchange pipe in the first hot water heat exchange circuit for the ORC generator is divided into a third pipe and a fourth pipe. The third pipe passes through the interior of the first heat exchanger section A and the first heat exchanger section B in sequence and is connected to the air inlet of the ORC generator. The fourth pipeline passes through the interior of the second heat exchanger section A and the second heat exchanger section B in sequence and is connected to the air inlet of the ORC generator. By setting up multiple flue gas treatment lines and power generation water heat exchange lines, it can effectively ensure that the waste heat in the flue gas is fully utilized, reduce the burden of equipment processing, improve the efficient utilization of waste heat, and avoid uneven temperature entering the flue gas purification system.

[0023] In the utility model, the system also includes a first dust collector, a second dust collector, a first main exhaust fan, a second main exhaust fan, a flue gas mixer, a first desulfurization booster, and a second desulfurization booster. Among them, the first pipeline and the second pipeline are both connected to the air inlet of the flue gas mixer, and the air outlet of the flue gas mixer is connected to the air inlet of the first heat exchanger section A and the second heat exchanger section A through the sixth flue gas pipeline and the seventh flue gas pipeline respectively. Along the direction of the flue gas, the first dust collector and the first main exhaust fan are sequentially arranged on the first pipeline, and the second dust collector and the second main exhaust fan are sequentially arranged on the second pipeline. The first desulfurization booster is arranged on the sixth flue gas pipeline, and the second desulfurization booster is arranged on the seventh flue gas pipeline. The first desulfurization booster and the second desulfurization booster are activated carbon desulfurization booster fans. Through the two-stage hot water heat exchange of the sintering flue and the activated carbon desulfurization booster fan, the flue gas temperature entering the flue gas purification system inlet is reduced to the greatest extent, ensuring the safe operation of the flue gas purification system. It also efficiently utilizes the flue gas waste heat in the sintering flue, reducing the power consumption and flue gas treatment volume of the sintering flue gas purification system.

[0024] In the utility model, the system also includes a first muffler, a first cold air supplement valve, a second muffler, and a second cold air supplement valve. The first muffler is arranged above the first cold air supplement valve, and the air outlet of the first cold air supplement valve is connected to the first pipe. The second muffler is arranged above the second cold air supplement valve, and the air outlet of the second cold air supplement valve is connected to the second pipe. Among them, the flue gas temperature coming out of the first and second large flue waste heat boilers is 180℃~200℃, and the flue gas temperature drops to about 120℃ after being divided into two paths and entering the first and second heat exchanger B sections respectively. After heat exchange, when passing through the first and second electrostatic precipitators and the first and second main exhaust fans in turn, the temperature of the sintering flue gas rises to about 150℃ due to the temperature rise caused by the operation of the fans. The sintering flue gas after passing through the two main exhaust fans is mixed by the flue gas mixer and then enters the two desulfurization booster fans. In order to ensure that the flue gas temperature entering the flue gas purification system is not higher than 135°C, the flue gas enters the ORC hot water heat exchanger section A after coming out of the desulfurization booster fan, and the flue gas is cooled by heating water. The water source of the hot water heat exchanger for power generation is 80°C circulating hot water. After passing through the heat exchanger, the temperature is raised to 150°C and finally sent to the ORC generator set for power generation. After heat exchange, the water temperature is reduced to 80°C and then sent to the heat exchanger section A and section B through the circulation pump, forming a complete cycle.

[0025] In the utility model, the waste heat boiler above the ring cooler is mainly arranged in the middle and rear sections of the ring cooler (ring cooling section 2 and ring cooling section 3), wherein hot water heater section 1 and hot water heater section 2 are arranged in the waste heat boiler. Along the direction of the material, hot water heater section 2 and hot water heater section 1 are arranged in sequence in the waste heat boiler. The heat exchange pipeline separates the fifth pipeline, which passes through the interior of hot water heater section 1 and hot water heater section 2 in sequence and is connected to the air inlet of the ORC generator. And a plug valve is provided at the connection between hot water heater section 1 and hot water heater section 2 and the ring cooler. Among them, a first ring cooling fan is provided below the ring cooler located at hot water heater section 2. A second ring cooling fan is provided below the ring cooler located at hot water heater section 1. The wind penetrates the material layer through the first ring cooling fan and the second ring cooling fan in the middle and rear sections of the ring cooler, passes through hot water heater section 1 for power generation and hot water heater section 2 for power generation in sequence, and is finally discharged into the atmosphere. The water source of the hot water heat exchanger for power generation after the ORC generator generates electricity is 80℃ circulating hot water. After passing through the heat exchanger of the hot water heater 1 and the hot water heater 2, the temperature is raised to 150℃ and finally sent to the ORC generator set for power generation. After power generation, the water temperature is reduced to 80℃ and then sent to the ring cooler through the circulation pump to form a complete cycle. (Among them, the ORC power generation system and circulating hot water system, that is, the heat exchange pipeline part, are shared with the sintering flue.)

[0026] Compared with the prior art, the utility model has the following beneficial effects:

[0027] 1. In the utility model, the flue gas waste heat generated at the tail of the sintering flue is exchanged with the power generation water of the ORC generator through two-stage hot water heat exchangers. The hot water after the heat exchange continues to enter the ORC generator to do work, and the flue gas temperature after the heat exchange is below 135°C, which minimizes the flue gas temperature entering the flue gas purification system and ensures the safe operation of the subsequent system. Secondly, the waste heat resources in the middle and rear sections of the ring cooler (the flue gas temperature is generally below 250°C) are used to heat the power generation water of the ORC generator, effectively utilizing the waste heat resources in the middle and rear sections of the ring cooler.

[0028] 2. In the present invention, the inlet flue gas temperature of the sintering flue gas purification system is reduced by two-stage hot water heat exchange in the sintering flue gas duct and the heat exchanger, and the flue gas treatment capacity of the flue gas purification system is reduced by about 13%. Among them, by reducing the inlet flue gas temperature of the sintering flue gas purification system, the power consumption of the sintering flue gas system is reduced by about 100kW. Considering an annual operation of 8000h, 800,000 kWh of electricity can be saved each year. The hot water after heat exchange by the heat exchanger is used for ORC power generation, which increases the self-generation rate of the sintering system and reduces the overall operating cost of the sintering process.

[0029] 3. In the present invention, the same ORC power generation system is used for the sintering flue gas and the waste heat in the middle and rear stages of the ring cooler. The net output of the entire sintering waste heat power generation system is the highest, which minimizes the investment cost, operation cost and land resources of the ORC power generation system.

[0030] 4. In the present invention, the power consumption of the fan of the flue gas-air heat exchanger can be reduced by about 100kW. Considering that the heat exchanger increases the resistance by 500Pa and the flue gas temperature in the large flue is reduced from 150℃ to 120℃, adding a two-stage hot water heat exchanger can reduce the power consumption of the main exhaust fan by about 600kW, and the total power consumption is reduced by 700kW. Considering that the annual operation is 8000h, 5.6 million kWh of power consumption can be saved annually. Secondly, the waste heat of the sintering large flue, the inlet flue gas of the flue gas purification system, and the flue gas in the middle and rear sections of the ring cooler can be used to the maximum extent, and a maximum of about 400t / h of 150℃ hot water can be produced (the hot water temperature is increased from 80℃ to 150℃), which enters the ORC generator set for power generation, and the net external power supply is about 2700kW. Considering that the annual operation is 8000h, 21.6 million kWh of new power generation can be added each year. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural diagram of the sintering waste heat comprehensive utilization system of the utility model.

[0032] Figure 2 It is a schematic diagram of the structure of hot water heat exchange of the ORC generator of the utility model.

[0033] Reference numerals:

[0034] A: circulating water pump; 1: large flue waste heat boiler; 101: first large flue waste heat boiler; 102: second large flue waste heat boiler; 2: heat exchanger section B; 201: first heat exchanger section B; 202: second heat exchanger section B; 3: heat exchanger section A; 301: first heat exchanger section A; 302: second heat exchanger section A; 4: ring cooler; 5: ORC generator; 6: hot water heater section 1; 7: hot water heater section 2; 8: gate valve; 9: first ring cooler; 10: second ring cooler; 11: first dust collector; 12: second dust collector; 13: first main exhaust fan; 14: second main exhaust fan; 15: flue gas mixer; 16: first desulfurization booster; 17: second desulfurization booster; 18: first muffler; 19: first supplementary cold air valve; 20: second muffler; 21: second supplementary cold air valve;

[0035] L0: heat exchange pipe; L1: first pipe; L2: second pipe; L3: third pipe; L4: fourth pipe; L5: fifth pipe; L6: sixth flue gas pipe; L7: seventh flue gas pipe. DETAILED DESCRIPTION

[0036] The technical solution of the utility model is illustrated below, and the scope of protection requested for the utility model includes but is not limited to the following embodiments.

[0037] According to the implementation scheme of the utility model, a sintering waste heat comprehensive utilization system is provided.

[0038] A sintering waste heat comprehensive utilization system, the system includes a large flue waste heat boiler 1, a heat exchanger section B 2, a heat exchanger section A 3, a ring cooler 4, and an ORC generator 5. The flue gas outlet of the large flue waste heat boiler 1 is connected to the air inlet of the heat exchanger section B 2. The air outlet of the heat exchanger section B 2 is connected to the air inlet of the heat exchanger section A 3. The air outlet of the heat exchanger section A 3 is connected to the flue gas purification system. The water outlet of the ORC generator 5 passes through the interior of the heat exchanger section A 3 and the heat exchanger section B 2 in sequence through the heat exchange pipe L0, and then is connected to the air inlet of the ORC generator 5. A waste heat boiler is arranged above the ring cooler 4, and a pipe is branched from the heat exchange pipe L0 between the water outlet of the ORC generator 5 and the heat exchanger section A 3, and then passes through the waste heat boiler on the ring cooler 4 and is connected to the air inlet of the ORC generator 5.

[0039] In the present utility model, the heat exchanger section B 2 includes a first heat exchanger section B 201 and a second heat exchanger section B 202. The heat exchanger section A 3 includes a first heat exchanger section A 301 and a second heat exchanger section A 302. The air inlets of the first heat exchanger section B 201 and the second heat exchanger section B 202 are both connected to the air outlet of the large flue waste heat boiler 1. The air outlet of the first heat exchanger section B 201 is connected to the air inlet of the first heat exchanger section A 301 through the first pipeline L1. The air outlet of the second heat exchanger section B 202 is connected to the air inlet of the second heat exchanger section A 302 through the second pipeline L2.

[0040] In the present invention, the water outlet of the ORC generator 5 is connected to a heat exchange pipe L0. The heat exchange pipe L0 is divided into a third pipe L3 and a fourth pipe L4. The third pipe L3 passes through the interior of the first heat exchanger A section 301 and the first heat exchanger B section 201 in sequence and is then connected to the air inlet of the ORC generator 5. The fourth pipe L4 passes through the interior of the second heat exchanger A section 302 and the second heat exchanger B section 202 in sequence and is then connected to the air inlet of the ORC generator 5.

[0041] In the present invention, a circulating water pump A is also provided on the heat exchange pipe L0.

[0042] In the present invention, the annular cooler 4 includes a hot water heater section 1 6 and a hot water heater section 2 7. Along the material flow, the hot water heater section 2 7 and the hot water heater section 1 6 are sequentially arranged above the middle and rear sections of the annular cooler 4. The heat exchange pipe L0 branches out a fifth pipe L5 which passes through the inside of the hot water heater section 1 6 and the hot water heater section 2 7 in sequence and is then connected to the air inlet of the ORC generator 5.

[0043] In the present invention, a gate valve 8 is provided at the connection between the hot water heater section 1 6 and the hot water heater section 2 7 and the ring cooler 4 .

[0044] In the present invention, a first ring cooling fan 9 and a second ring cooling fan 10 are arranged below the middle and rear section of the ring cooling machine 4 of the system.

[0045] In the present invention, a first ring cooling fan 9 is provided below the ring cooling machine 4 at the second stage 7 of the hot water heater. A second ring cooling fan 10 is provided below the ring cooling machine 4 at the first stage 6 of the hot water heater.

[0046] In the present invention, the large flue waste heat boiler 1 includes a first large flue waste heat boiler 101 and a second large flue waste heat boiler 102. The air outlet of the first large flue waste heat boiler 101 is connected to the air inlet of the first heat exchanger B section 201. The air outlet of the second large flue waste heat boiler 102 is connected to the air inlet of the second heat exchanger B section 202.

[0047] In the present utility model, the system further comprises a first dust collector 11, a second dust collector 12, a first main exhaust fan 13, and a second main exhaust fan 14. Along the direction of the flue gas, the first dust collector 11 and the first main exhaust fan 13 are sequentially arranged on the first pipeline L1. Along the direction of the flue gas, the second dust collector 12 and the second main exhaust fan 14 are sequentially arranged on the second pipeline L2.

[0048] In the present invention, the system further includes a smoke mixer 15. The first pipe L1 and the second pipe L2 are both connected to the air inlet of the smoke mixer 15. The smoke outlet of the smoke mixer 15 is connected to the air inlets of the first heat exchanger section A 301 and the second heat exchanger section A 302 respectively through the sixth smoke pipe L6 and the seventh smoke pipe L7.

[0049] In the present invention, the system further comprises a first desulfurization supercharger 16 and a second desulfurization supercharger 17. Along the direction of the flue gas, the first desulfurization supercharger 16 is arranged on the sixth flue gas duct L6. The second desulfurization supercharger 17 is arranged on the seventh flue gas duct L7.

[0050] In the utility model, the system further includes a first muffler 18, a first supplementary cold air valve 19, a second muffler 20, and a second supplementary cold air valve 21. The first muffler 18 is arranged above the first supplementary cold air valve 19. The air outlet of the first supplementary cold air valve 19 is connected to the first pipeline L1. The second muffler 20 is arranged above the second supplementary cold air valve 21. The air outlet of the second supplementary cold air valve 21 is connected to the second pipeline L2.

[0051] Example 1

[0052] like Figure 1 and Figure 2 As shown, a sintering waste heat comprehensive utilization system includes a large flue waste heat boiler 1, a heat exchanger section B 2, a heat exchanger section A 3, a ring cooler 4, and an ORC generator 5. The flue gas outlet of the large flue waste heat boiler 1 is connected to the air inlet of the heat exchanger section B 2. The air outlet of the heat exchanger section B 2 is connected to the air inlet of the heat exchanger section A 3. The air outlet of the heat exchanger section A 3 is connected to the flue gas purification system. The water outlet of the ORC generator 5 passes through the interior of the heat exchanger section A 3 and the heat exchanger section B 2 in sequence through the heat exchange pipe L0, and then is connected to the air inlet of the ORC generator 5. A waste heat boiler is arranged above the ring cooler 4, and a pipe is branched from the heat exchange pipe L0 between the water outlet of the ORC generator 5 and the heat exchanger section A 3, and then passes through the waste heat boiler on the ring cooler 4 and is connected to the air inlet of the ORC generator 5.

[0053] Example 2

[0054] like Figure 1As shown, Example 1 is repeated, and the heat exchanger B section 2 includes a first heat exchanger B section 201 and a second heat exchanger B section 202. The heat exchanger A section 3 includes a first heat exchanger A section 301 and a second heat exchanger A section 302. The air inlets of the first heat exchanger B section 201 and the second heat exchanger B section 202 are both connected to the air outlet of the large flue waste heat boiler 1. The air outlet of the first heat exchanger B section 201 is connected to the air inlet of the first heat exchanger A section 301 through the first pipeline L1. The air outlet of the second heat exchanger B section 202 is connected to the air inlet of the second heat exchanger A section 302 through the second pipeline L2.

[0055] Example 3

[0056] Repeat Example 2, the water outlet of the ORC generator 5 is connected with a heat exchange pipe L0. The heat exchange pipe L0 is divided into a third pipe L3 and a fourth pipe L4. The third pipe L3 passes through the interior of the first heat exchanger A section 301 and the first heat exchanger B section 201 in sequence and is connected to the air inlet of the ORC generator 5. The fourth pipe L4 passes through the interior of the second heat exchanger A section 302 and the second heat exchanger B section 202 in sequence and is connected to the air inlet of the ORC generator 5.

[0057] Example 4

[0058] Repeat Example 3, and a circulating water pump A is further provided on the heat exchange pipe L0.

[0059] Example 5

[0060] Repeat Example 4, the annular cooler 4 includes a hot water heater 1 section 6 and a hot water heater 2 section 7. Along the material flow, the hot water heater 2 section 7 and the hot water heater 1 section 6 are sequentially arranged above the middle and rear sections of the annular cooler 4. The heat exchange pipe L0 branches out a fifth pipe L5 which passes through the inside of the hot water heater 1 section 6 and the hot water heater 2 section 7 in sequence and then is connected to the air inlet of the ORC generator 5.

[0061] Example 6

[0062] Repeat Example 5, and the connection points between the hot water heater section 1 6 and the hot water heater section 2 7 and the ring cooler 4 are all provided with a gate valve 8.

[0063] Example 7

[0064] Example 6 is repeated, except that a first ring cooling fan 9 and a second ring cooling fan 10 are provided below the middle and rear section of the ring cooling machine 4 of the system.

[0065] Example 8

[0066] Example 7 is repeated, except that a first ring cooling fan 9 is provided below the ring cooling machine 4 at the second stage 7 of the hot water heater. A second ring cooling fan 10 is provided below the ring cooling machine 4 at the first stage 6 of the hot water heater.

[0067] Example 9

[0068] Example 8 is repeated, except that the large flue waste heat boiler 1 includes a first large flue waste heat boiler 101 and a second large flue waste heat boiler 102. The air outlet of the first large flue waste heat boiler 101 is connected to the air inlet of the first heat exchanger B section 201. The air outlet of the second large flue waste heat boiler 102 is connected to the air inlet of the second heat exchanger B section 202.

[0069] Example 10

[0070] Example 9 is repeated, except that the system further includes a first dust collector 11, a second dust collector 12, a first main exhaust fan 13, and a second main exhaust fan 14. Along the direction of the flue gas, the first duct L1 is provided with the first dust collector 11 and the first main exhaust fan 13 in sequence. Along the direction of the flue gas, the second duct L2 is provided with the second dust collector 12 and the second main exhaust fan 14 in sequence.

[0071] Embodiment 11

[0072] Example 10 is repeated, except that the system further includes a smoke mixer 15. The first pipe L1 and the second pipe L2 are both connected to the air inlet of the smoke mixer 15. The smoke outlet of the smoke mixer 15 is connected to the air inlets of the first heat exchanger section A 301 and the second heat exchanger section A 302 through the sixth smoke pipe L6 and the seventh smoke pipe L7, respectively.

[0073] Example 12

[0074] Example 11 is repeated, except that the system further includes a first desulfurization supercharger 16 and a second desulfurization supercharger 17. Along the direction of the flue gas, the first desulfurization supercharger 16 is arranged on the sixth flue gas duct L6. The second desulfurization supercharger 17 is arranged on the seventh flue gas duct L7.

[0075] Example 13

[0076] Example 12 is repeated, except that the system further includes a first muffler 18, a first supplementary cold air valve 19, a second muffler 20, and a second supplementary cold air valve 21. The first muffler 18 is arranged above the first supplementary cold air valve 19. The air outlet of the first supplementary cold air valve 19 is connected to the first pipeline L1. The second muffler 20 is arranged above the second supplementary cold air valve 21. The air outlet of the second supplementary cold air valve 21 is connected to the second pipeline L2.

Claims

1. A sintering waste heat comprehensive utilization system, characterized by: The system comprises a large flue waste heat boiler (1), a heat exchanger section B (2), a heat exchanger section A (3), a ring cooler (4), and an ORC generator (5); the flue gas outlet of the large flue waste heat boiler (1) is connected to the air inlet of the heat exchanger section B (2); the air outlet of the heat exchanger section B (2) is connected to the air inlet of the heat exchanger section A (3); the air outlet of the heat exchanger section A (3) is connected to a flue gas purification system; the water outlet of the ORC generator (5) passes through the interior of the heat exchanger section A (3) and the heat exchanger section B (2) in sequence through a heat exchange pipe (L0) and then is connected to the air inlet of the ORC generator (5); a waste heat boiler is arranged above the ring cooler (4), and a pipe is branched from the heat exchange pipe (L0) between the water outlet of the ORC generator (5) and the heat exchanger section A (3), passes through the waste heat boiler on the ring cooler (4), and then is connected to the air inlet of the ORC generator (5).

2. The system according to claim 1, characterized in that: The heat exchanger section B (2) comprises a first heat exchanger section B (201) and a second heat exchanger section B (202); the heat exchanger section A (3) comprises a first heat exchanger section A (301) and a second heat exchanger section A (302); the air inlets of the first heat exchanger section B (201) and the second heat exchanger section B (202) are both connected to the air outlet of the large flue waste heat boiler (1); the air outlet of the first heat exchanger section B (201) is connected to the air inlet of the first heat exchanger section A (301) through a first pipeline (L1); the air outlet of the second heat exchanger section B (202) is connected to the air inlet of the second heat exchanger section A (302) through a second pipeline (L2).

3. The system according to claim 2, characterized in that: The water outlet of the ORC generator (5) is connected to a heat exchange pipe (L0); the heat exchange pipe (L0) is divided into a third pipe (L3) and a fourth pipe (L4); the third pipe (L3) sequentially passes through the interior of the first heat exchanger section A (301) and the first heat exchanger section B (201) and is then connected to the air inlet of the ORC generator (5); the fourth pipe (L4) sequentially passes through the interior of the second heat exchanger section A (302) and the second heat exchanger section B (202) and is then connected to the air inlet of the ORC generator (5).

4. The system according to claim 3, characterized in that: The heat exchange pipe (L0) is also provided with a circulating water pump (A).

5. The system according to any one of claims 1 to 4, characterized in that: The ring cooler (4) comprises a hot water heater section 1 (6) and a hot water heater section 2 (7); along the material flow direction, the hot water heater section 2 (7) and the hot water heater section 1 (6) are arranged in sequence above the middle and rear sections of the ring cooler (4); a fifth pipe (L5) is branched from the heat exchange pipe (L0) and passes through the inside of the hot water heater section 1 (6) and the hot water heater section 2 (7) in sequence, and then is connected to the air inlet of the ORC generator (5).

6. The system according to claim 5, characterized in that: The connection points between the hot water heater section 1 (6) and the hot water heater section 2 (7) and the ring cooler (4) are both provided with a gate valve (8).

7. The system according to claim 5, characterized in that: A first ring cooling air fan (9) and a second ring cooling air fan (10) are arranged below the middle and rear sections of the ring cooling machine (4).

8. The system according to claim 7, characterized in that: A first ring cooling fan (9) is arranged below the ring cooling machine (4) located at the second stage (7) of the hot water heater; and a second ring cooling fan (10) is arranged below the ring cooling machine (4) located at the first stage (6) of the hot water heater.

9. The system according to any one of claims 2 to 4, characterized in that: The large flue waste heat boiler (1) comprises a first large flue waste heat boiler (101) and a second large flue waste heat boiler (102); the air outlet of the first large flue waste heat boiler (101) is connected to the air inlet of the first heat exchanger section B (201); the air outlet of the second large flue waste heat boiler (102) is connected to the air inlet of the second heat exchanger section B (202).

10. The system according to any one of claims 2 to 4, characterized in that: The system further comprises a first dust collector (11), a second dust collector (12), a first main exhaust fan (13), and a second main exhaust fan (14); along the direction of the flue gas, the first dust collector (11) and the first main exhaust fan (13) are sequentially arranged on the first pipeline (L1); along the direction of the flue gas, the second dust collector (12) and the second main exhaust fan (14) are sequentially arranged on the second pipeline (L2).

11. The system according to any one of claims 2 to 4, characterized in that: The system also includes a smoke mixer (15); the first pipe (L1) and the second pipe (L2) are both connected to the air inlet of the smoke mixer (15); the smoke outlet of the smoke mixer (15) is connected to the air inlets of the first heat exchanger section A (301) and the second heat exchanger section A (302) through a sixth smoke pipe (L6) and a seventh smoke pipe (L7), respectively.

12. The system according to claim 11, characterized in that: The system also includes a first desulfurization booster (16) and a second desulfurization booster (17); along the direction of the flue gas, the first desulfurization booster (16) is arranged on the sixth flue gas duct (L6); and the second desulfurization booster (17) is arranged on the seventh flue gas duct (L7).

13. The system according to any one of claims 2 to 4, characterized in that: The system further comprises a first muffler (18), a first supplementary cold air valve (19), a second muffler (20), and a second supplementary cold air valve (21); the first muffler (18) is arranged above the first supplementary cold air valve (19); an air outlet of the first supplementary cold air valve (19) is connected to a first pipeline (L1); the second muffler (20) is arranged above the second supplementary cold air valve (21); and an air outlet of the second supplementary cold air valve (21) is connected to a second pipeline (L2).

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