CN219083395U - System for realizing flue gas purification and waste heat recovery at outlet of desulfurizing tower by using heat pump - Google Patents
System for realizing flue gas purification and waste heat recovery at outlet of desulfurizing tower by using heat pump Download PDFInfo
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- CN219083395U CN219083395U CN202223531490.7U CN202223531490U CN219083395U CN 219083395 U CN219083395 U CN 219083395U CN 202223531490 U CN202223531490 U CN 202223531490U CN 219083395 U CN219083395 U CN 219083395U
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Abstract
The utility model discloses a system for realizing flue gas purification and waste heat recovery at an outlet of a desulfurizing tower by using a heat pump, which comprises the following components: the input end of the air heating module is contacted with air; the flue gas cooling module is connected with the output end of the air heating module; the flue gas emission module is connected with the output end of the flue gas cooling module and is used for desulfurizing, exchanging heat and discharging low-temperature raw flue gas; the heat pump comprises a driving heat source end, a cold source end and an outlet heat source end; the heat source end of the outlet of the heat pump provides heat energy for the air heating module under the action of the heat source from the flue gas cooling module and the cold source from the flue gas emission module; according to the utility model, the cold air entering the air preheater is heated by utilizing the clean flue gas at the outlet of the desulfurizing tower, so that on one hand, the temperature of the cold air entering the air preheater is increased, a hot air recirculation or steam heater is replaced, and the energy consumption of a unit is reduced; on the other hand, the waste heat of the clean flue gas at the outlet of the desulfurizing tower is utilized, a cooling effect is provided for the flue gas discharge process, and the economy of the unit is improved.
Description
Technical Field
The utility model relates to the technical field of energy conservation of coal-fired boilers, in particular to a system for realizing clean flue gas waste heat recovery at an outlet of a desulfurizing tower by using a heat pump.
Background
In order to reduce the coal consumption of the coal motor unit as much as possible and improve the economy, waste heat of the unit needs to be utilized as much as possible; the heat of the clean flue gas at the outlet of the desulfurizing tower belongs to the complete waste heat of the coal-fired unit, and is discharged to the atmosphere through a chimney, and the heat of the part is huge; waste heat in the clean flue gas at the outlet of the desulfurizing tower is recycled, so that the utilization efficiency of electric coal can be improved, the consumption of electric coal can be reduced, the production cost of enterprises can be reduced, and meanwhile, clean energy consumption can be promoted.
By comprehensively considering the problems of the aspects, the utility model provides a system for realizing the recovery of the clean flue gas waste heat at the outlet of the desulfurizing tower by using the heat pump, which is a good measure.
Disclosure of Invention
In view of the above, the utility model provides a system for realizing flue gas purifying waste heat recovery at an outlet of a desulfurizing tower by using a heat pump, equipment used by the system and the method is a warm air device, the heat pump, a flue gas cooler and a heat medium water heat exchanger, wherein the warm air device is arranged in an air flue at an inlet of an air preheater, the flue gas cooler is arranged in an original flue gas flue at an outlet of a dust remover, the heat medium water heat exchanger is arranged in the flue gas purifying flue at the outlet of the desulfurizing tower, and the warm air device, the flue gas cooler and the heat medium water heat exchanger realize heat transfer through the heat pump, so that the aim of heating cold air by using the heat of the flue gas purifying at the outlet of the desulfurizing tower is fulfilled.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
a system for utilizing a heat pump to realize flue gas cleaning waste heat recovery at an outlet of a desulfurizing tower, comprising:
the input end of the air heating module is contacted with air and is used for heating the air into high-temperature air;
the flue gas cooling module is connected with the output end of the air heating module and used for cooling high-temperature flue gas exhausted by the air heating module;
the flue gas emission module is connected with the output end of the flue gas cooling module and is used for desulfurizing, exchanging heat and discharging low-temperature raw flue gas generated by the flue gas cooling module;
the heat pump comprises a driving heat source end, a cold source end and an outlet heat source end; the driving heat source end is connected with the flue gas cooling module, the cold source end is connected with the flue gas emission module, and the outlet heat source end is connected with the air heating module; the heat source end of the heat pump outlet provides heat energy for the air heating module under the action of the heat source from the flue gas cooling module and the cold source from the flue gas emission module.
Preferably, in the above system for recovering flue gas waste heat by using a heat pump, the air heating module includes:
the input end of the air heater is provided with an air pipeline connected to the air, the air heater is connected with the outlet heat source end, and the air is heated into medium-temperature air by the heat transmitted by the outlet heat source end and then is discharged from the output end of the air heater;
the input end of the air preheater is connected with the output end of the air heater through a medium-temperature air pipeline, and the air preheater heats medium-temperature air into high-temperature air and then is discharged from the output end of the air preheater;
the boiler is connected with the output end of the air preheater through a high-temperature air pipeline, and a dust remover is arranged at the smoke outlet of the boiler.
Preferably, in the above system for recovering flue gas waste heat by using a heat pump to realize clean flue gas at an outlet of a desulfurizing tower, the flue gas cooling module includes:
the high-temperature flue gas pipeline is connected with the output end of the air heating module and is used for receiving high-temperature flue gas;
and the flue gas cooler is connected with the output end of the high-temperature flue gas pipeline and is used for absorbing heat carried by the high-temperature flue gas and cooling the high-temperature raw flue gas into low-temperature raw flue gas.
Preferably, in the above system for recovering flue gas waste heat by using a heat pump to realize clean flue gas at an outlet of a desulfurizing tower, the flue gas emission module includes:
the desulfurizing tower is connected with the output end of the flue gas cooler through a low-temperature flue gas pipeline and is used for desulfurizing low-temperature raw flue gas into high-temperature clean flue gas;
the heat medium water heat exchanger is connected with the flue gas discharge outlet of the desulfurization tower through a first discharge pipeline, absorbs heat of high-temperature clean flue gas generated by the desulfurization tower, and converts the high-temperature clean flue gas into low-temperature clean flue gas beneficial to discharge;
and the chimney is connected with the output end of the heat medium water heat exchanger through a second discharge pipeline and is used for discharging low-temperature clean flue gas generated by the heat medium water heat exchanger into the atmosphere.
Preferably, in the above system for recovering flue gas waste heat from an outlet of a desulfurizing tower by using a heat pump, the heat pump includes a cold source end, a compressor, an expansion valve, a driving heat source end and an outlet heat source end;
the cold source end is connected with the heat medium water heat exchanger, absorbs low-temperature heat energy obtained by the heat medium water heat exchanger, transmits the low-temperature heat energy to the compressor to be compressed into high-temperature heat energy and transmits the high-temperature heat energy to the driving heat source end, and the high-temperature heat energy and the heat energy absorbed by the flue gas cooler are converged at the driving heat source end and transmitted to the heater through the outlet heat source end to provide heat energy for the heater;
and the high-temperature heat energy is condensed by the driving heat source end and then returned to the cold source end by the expansion valve, and the temperature of the cold source end is reduced to provide a cooling effect for the heat medium water heat exchanger.
Preferably, in the above system for recovering flue gas waste heat by using heat pump to realize clean flue gas at outlet of desulfurizing tower, the system further comprises an overheat protection device:
the temperature sensor is arranged on the flue gas cooler and used for detecting the temperature of high-temperature flue gas transmitted into the flue gas cooler in real time;
the cooling component is arranged in the flue gas cooler and is used for assisting in reducing the temperature of high-temperature flue gas;
the controller is electrically connected with the temperature sensor and the cooling component, is provided with a temperature range A0, and drives the cooling component to work when the temperature A of the high-temperature flue gas detected by the temperature sensor is more than A0 so as to assist the flue gas cooler to cool down
The steps of the technical scheme are as follows:
the cold air is heated by the heater and then is sent to the air preheater for heating, the heated cold air is changed into hot air, and the hot air is finally sent to the boiler for combustion; the raw flue gas at the outlet of the dust remover is cooled by a flue gas cooler and then is sent to a desulfurizing tower for desulfurization treatment; the clean flue gas at the outlet of the desulfurizing tower is discharged to the atmosphere through a chimney after being cooled at a heat medium water heat exchanger; the flue gas cooler absorbs heat of raw flue gas and is used as a driving heat source of the heat pump to be sent to the heat pump; the heat medium water heat exchanger absorbs the heat of the clean flue gas and is used as a cold source of the heat pump to be sent to the heat pump; under the action of a compressor of the heat pump, the heat source and the cold source are driven to be changed into heat source at the outlet of the heat pump, the heat energy of the loop in the reciprocating process passes through the expansion valve to reduce the temperature of the cold source, and a cooling effect is provided for the heat medium water heat exchanger.
The beneficial effects of the utility model are as follows: according to the utility model, the cold air entering the air preheater is heated by utilizing the clean flue gas at the outlet of the desulfurizing tower, so that on one hand, the temperature of the cold air entering the air preheater is increased, a hot air recirculation or steam heater is replaced, and the energy consumption of a unit is reduced; on the other hand, the waste heat of the clean flue gas at the outlet of the desulfurizing tower is utilized, a cooling effect is provided for the flue gas discharge process, and the economy of the unit is improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of the structure of the present utility model.
In the figure: 1, a heat pump; 101, driving a heat source end; 102, a cold source end; 103, outlet heat source end; 4, a warm air device; 5, an air preheater; 6, a boiler; 7, a dust remover; 8, a high-temperature flue gas pipeline; 9, a flue gas cooler; 13, a desulfurizing tower; 14, a heat medium water heat exchanger; 15, a chimney; 201, discharge line one; 202, discharge line two.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In one embodiment, referring to fig. 1, a system for implementing flue gas waste heat recovery at the outlet of a desulfurizing tower by using a heat pump includes:
the input end of the air heater 4 is provided with an air pipeline connected to the air, the air heater 4 is connected with the outlet heat source end 103, and the air is heated into medium-temperature air by the heat transmitted by the outlet heat source end 103 and then is discharged from the output end of the air heater;
the input end of the air preheater 5 is connected with the output end of the heater 4 through a medium-temperature air pipeline, and the air preheater 5 heats medium-temperature air into high-temperature air and then is discharged from the output end of the air preheater;
the boiler 6 is connected with the output end of the air preheater 5 through a high-temperature air pipeline, and a dust remover 7 is arranged at the flue gas outlet of the boiler 6.
The flue gas cooling module is connected with the output end of the air heating module and used for cooling high-temperature flue gas exhausted by the air heating module; the flue gas emission module is connected with the output end of the flue gas cooling module and is used for desulfurizing, exchanging heat and discharging low-temperature raw flue gas generated by the flue gas cooling module; a heat pump 1 comprising a driving heat source end 101, a cold source end 102 and an outlet heat source end 103; the driving heat source end is connected with the 101 flue gas cooling module, the cold source end 102 is connected with the flue gas emission module, and the outlet heat source end 103 is connected with the air heating module; the heat source end of the outlet of the heat pump provides heat energy for the air heating module under the action of the heat source from the flue gas cooling module and the cold source from the flue gas emission module.
The beneficial effects of the embodiment are as follows: the heat pump is used for heating air, and the heated air heat is recovered into the heat pump to be circularly reciprocated, so that the energy consumption is reduced.
In one embodiment, referring to fig. 1, a system for implementing flue gas waste heat recovery at the outlet of a desulfurizing tower by using a heat pump includes:
the input end of the air heating module is contacted with air and is used for heating the air into high-temperature air;
the high-temperature flue gas pipeline 8 is connected with the output end of the air heating module and is used for receiving high-temperature flue gas;
the flue gas cooler 9 is connected with the output end of the high-temperature flue gas pipeline 8 and is used for absorbing heat carried by the high-temperature flue gas and cooling the high-temperature raw flue gas into low-temperature raw flue gas;
the desulfurizing tower 13 is connected with the output end of the flue gas cooler 9 through a low-temperature flue gas pipeline and is used for desulfurizing low-temperature raw flue gas into high-temperature clean flue gas;
the heat medium water heat exchanger 14 is connected with a flue gas discharge outlet of the desulfurization tower through a first discharge pipeline 201, absorbs heat of high-temperature clean flue gas generated by the desulfurization tower, and converts the high-temperature clean flue gas into low-temperature clean flue gas beneficial to discharge;
the chimney 15 is connected with the output end of the heat medium water heat exchanger 14 through a second discharge pipeline 202 and is used for discharging low-temperature clean flue gas generated by the heat medium water heat exchanger 14 into the atmosphere;
a heat pump 1 comprising a driving heat source end 101, a cold source end 102 and an outlet heat source end 103; the driving heat source end is connected with the 101 flue gas cooling module, the cold source end 102 is connected with the flue gas emission module, and the outlet heat source end 103 is connected with the air heating module; the heat source end of the outlet of the heat pump provides heat energy for the air heating module under the action of the heat source from the flue gas cooling module and the cold source from the flue gas emission module.
The beneficial effects of the embodiment are as follows: the heat of the high-temperature flue gas is recovered through a flue gas cooler, so that the waste energy is utilized while the flue gas is cooled and desulfurized; the energy existing in the exhaust flue gas is recovered, so that the economy of the unit is improved.
In one embodiment, referring to fig. 1, a system for implementing flue gas waste heat recovery at the outlet of a desulfurizing tower by using a heat pump includes:
the input end of the air heater 4 is provided with an air pipeline connected to the air, the air heater 4 is connected with the outlet heat source end 103, and the air is heated into medium-temperature air by the heat transmitted by the outlet heat source end 103 and then is discharged from the output end of the air heater;
the input end of the air preheater 5 is connected with the output end of the heater 4 through a medium-temperature air pipeline, and the air preheater 5 heats medium-temperature air into high-temperature air and then is discharged from the output end of the air preheater;
the boiler 6 is connected with the output end of the air preheater 5 through a high-temperature air pipeline, and a dust remover 7 is arranged at the flue gas outlet of the boiler 6;
a high-temperature flue gas pipeline 8 connected with the output end of the dust remover and used for receiving high-temperature flue gas;
the flue gas cooler 9 is connected with the output end of the high-temperature flue gas pipeline 8 and is used for absorbing heat carried by the high-temperature flue gas and cooling the high-temperature raw flue gas into low-temperature raw flue gas;
the desulfurizing tower 13 is connected with the output end of the flue gas cooler 9 through a low-temperature flue gas pipeline and is used for desulfurizing low-temperature raw flue gas into high-temperature clean flue gas;
the heat medium water heat exchanger 14 is connected with a flue gas discharge outlet of the desulfurization tower through a first discharge pipeline 201, absorbs heat of high-temperature clean flue gas generated by the desulfurization tower, and converts the high-temperature clean flue gas into low-temperature clean flue gas beneficial to discharge;
the chimney 15 is connected with the output end of the heat medium water heat exchanger 14 through a second discharge pipeline 202 and is used for discharging low-temperature clean flue gas generated by the heat medium water heat exchanger 14 into the atmosphere;
the heat pump comprises a cold source end 102, a compressor, an expansion valve, a driving heat source end 101 and an outlet heat source end 103;
the cold source end is connected with the heat medium water heat exchanger 14, absorbs low-temperature heat energy acquired by the heat medium water heat exchanger 14, transmits the low-temperature heat energy to the compressor to be compressed into high-temperature heat energy and transmits the high-temperature heat energy to the driving heat source end 101, and the high-temperature heat energy and heat energy absorbed by the flue gas cooler 9 are converged at the driving heat source end 101 and transmitted to the heater 4 through the outlet heat source end 103 to provide heat energy for the heater 4;
the high-temperature heat energy is condensed by driving the heat source end 101 and then returned to the cold source end 102 by the expansion valve, the temperature of the cold source end 102 is reduced, and a cooling effect is provided for the heat medium water heat exchanger 14.
The beneficial effects of the embodiment are as follows: the heat medium water heat exchanger is reasonably utilized as a cold source, so that the utilization of energy is improved, and the heat medium water heat exchanger is utilized as the cold source and simultaneously provides a refrigerating effect, so that the economy of the unit is improved.
In one embodiment, the flue gas waste heat recovery system for realizing the desulfurization tower outlet by using the heat pump further comprises an overheat protection device:
the temperature sensor is arranged on the flue gas cooler 9 and is used for detecting the temperature of the high-temperature flue gas transmitted into the flue gas cooler 9 in real time;
the cooling component is arranged inside the flue gas cooler 9 and is used for assisting in reducing the temperature of high-temperature flue gas;
and the controller is electrically connected with the temperature sensor and the cooling component, is provided with a temperature range A0, and drives the cooling component to work when the temperature A of the high-temperature flue gas detected by the temperature sensor is more than A0, so as to assist the flue gas cooler 9 to cool.
The beneficial effects of the embodiment are as follows: the possibility of short circuit shutdown of the flue gas cooler caused by the fact that high-temperature flue gas exceeds the load of the flue gas cooler is prevented, and stable operation of the unit is guaranteed.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. Utilize heat pump to realize desulfurizing tower outlet net flue gas waste heat recovery system, its characterized in that includes:
the input end of the air heating module is contacted with air and is used for heating the air into high-temperature air;
the flue gas cooling module is connected with the output end of the air heating module and used for cooling high-temperature flue gas exhausted by the air heating module;
the flue gas emission module is connected with the output end of the flue gas cooling module and is used for desulfurizing, exchanging heat and discharging low-temperature raw flue gas generated by the flue gas cooling module;
a heat pump (1) comprising a driving heat source end (101), a cold source end (102) and an outlet heat source end (103); the driving heat source end is connected with the flue gas cooling module (101), the cold source end (102) is connected with the flue gas emission module, and the outlet heat source end (103) is connected with the air heating module; the heat source end of the heat pump outlet provides heat energy for the air heating module under the action of the heat source from the flue gas cooling module and the cold source from the flue gas emission module.
2. The system for realizing clean flue gas waste heat recovery at an outlet of a desulfurizing tower by using a heat pump according to claim 1, wherein the air heating module comprises:
the input end of the air heater (4) is provided with an air pipeline connected to the air, the air heater (4) is connected with the outlet heat source end (103), and the air is heated into medium-temperature air by the heat transmitted by the outlet heat source end (103) and then is discharged from the output end of the air heater;
the input end of the air preheater (5) is connected with the output end of the air heater (4) through a medium-temperature air pipeline, and the air preheater (5) heats medium-temperature air into high-temperature air and then discharges the high-temperature air from the output end of the air preheater;
the boiler (6) is connected with the output end of the air preheater (5) through a high-temperature air pipeline, and a dust remover (7) is arranged at the smoke outlet of the boiler (6).
3. The system for realizing clean flue gas waste heat recovery at an outlet of a desulfurizing tower by using a heat pump according to claim 2, wherein the flue gas cooling module comprises:
the high-temperature flue gas pipeline (8) is connected with the output end of the air heating module and is used for receiving high-temperature flue gas;
and the flue gas cooler (9) is connected with the output end of the high-temperature flue gas pipeline (8) and is used for absorbing heat carried by high-temperature flue gas and cooling the high-temperature raw flue gas into low-temperature raw flue gas.
4. A system for implementing flue gas waste heat recovery at the outlet of a desulfurizing tower by using a heat pump according to claim 3, wherein the flue gas discharge module comprises:
the desulfurizing tower (13) is connected with the output end of the flue gas cooler (9) through a low-temperature flue gas pipeline and is used for desulfurizing low-temperature raw flue gas into high-temperature clean flue gas;
the heat medium water heat exchanger (14) is connected with the flue gas discharge outlet of the desulfurization tower through a first discharge pipeline (201) and absorbs heat of high-temperature clean flue gas generated by the desulfurization tower to convert the high-temperature clean flue gas into low-temperature clean flue gas beneficial to discharge;
and the chimney (15) is connected with the output end of the heat medium water heat exchanger (14) through a second discharge pipeline (202) and is used for discharging low-temperature clean flue gas generated by the heat medium water heat exchanger (14) into the atmosphere.
5. The system for realizing the flue gas waste heat recovery at the outlet of the desulfurizing tower by utilizing the heat pump according to claim 4, wherein the heat pump comprises a cold source end (102), a compressor, an expansion valve, a driving heat source end (101) and an outlet heat source end (103);
the cold source end is connected with the heat medium water heat exchanger (14), absorbs low-temperature heat energy obtained by the heat medium water heat exchanger (14), transmits the low-temperature heat energy to the compressor to be compressed into high-temperature heat energy and transmits the high-temperature heat energy to the driving heat source end (101), and the high-temperature heat energy and the heat energy absorbed by the flue gas cooler (9) are converged at the driving heat source end (101) and transmitted to the heater (4) through the outlet heat source end (103) to provide heat energy for the heater (4);
the high-temperature heat energy is condensed by the driving heat source end (101) and then returned to the cold source end (102) by the expansion valve, and the temperature of the cold source end (102) is reduced to provide a cooling effect for the heat medium water heat exchanger (14).
6. A system for recovering flue gas waste heat from an outlet of a desulfurizing tower by using a heat pump according to claim 3, further comprising an overheat protection device:
the temperature sensor is arranged on the flue gas cooler (9) and is used for detecting the temperature of high-temperature flue gas transmitted into the flue gas cooler (9) in real time;
the cooling component is arranged inside the flue gas cooler (9) and is used for assisting in reducing the temperature of high-temperature flue gas;
and the controller is electrically connected with the temperature sensor and the cooling component, is provided with a temperature range A0, and drives the cooling component to work when the temperature A of the high-temperature flue gas detected by the temperature sensor is more than A0 so as to assist the flue gas cooler (9) to cool.
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| CN202223531490.7U CN219083395U (en) | 2022-12-28 | 2022-12-28 | System for realizing flue gas purification and waste heat recovery at outlet of desulfurizing tower by using heat pump |
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| CN202223531490.7U CN219083395U (en) | 2022-12-28 | 2022-12-28 | System for realizing flue gas purification and waste heat recovery at outlet of desulfurizing tower by using heat pump |
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| CN118310291A (en) * | 2024-06-07 | 2024-07-09 | 新乡市长城机械有限公司 | Treatment system for drying slag by using lime kiln tail gas and application method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118310291A (en) * | 2024-06-07 | 2024-07-09 | 新乡市长城机械有限公司 | Treatment system for drying slag by using lime kiln tail gas and application method thereof |
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