CN113339872A - Slurry waste heat recycling system - Google Patents
Slurry waste heat recycling system Download PDFInfo
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- CN113339872A CN113339872A CN202110587097.0A CN202110587097A CN113339872A CN 113339872 A CN113339872 A CN 113339872A CN 202110587097 A CN202110587097 A CN 202110587097A CN 113339872 A CN113339872 A CN 113339872A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/343—Heat recovery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
- F24D2200/123—Compression type heat pumps
Abstract
The invention discloses a slurry waste heat recycling system, and relates to a flue gas waste heat utilization system. Its purpose is in order to provide a slurry waste heat cyclic utilization system that can make full use of steam high-quality heat energy, desulfurization flue gas, reduce energy consumption. The slurry waste heat recycling system comprises a steam power device, a heat pump system, a slurry heat exchange device and a desulfurization system, wherein the desulfurization system comprises a desulfurization tower and a slurry circulation pipeline; the slurry heat exchange device comprises a slurry inlet, a slurry outlet, a cold water inlet and a hot water outlet, the slurry inlet and the slurry outlet of the slurry heat exchange device are connected with a slurry circulating pipeline, and the cold water inlet and the hot water outlet of the slurry heat exchange device are respectively connected with a circulating water pipeline; the heat pump system comprises a compressor, a first heat exchanger, a throttle valve and a second heat exchanger which are connected in sequence; the steam power device comprises a steam inlet, a steam outlet and a power output end, the power output end of the steam power device is connected with the compressor, exhaust steam of the steam outlet of the steam power device enters the heater, and the heater is used for heating circulating water.
Description
Technical Field
The invention relates to the technical field of flue gas waste heat utilization and cyclic heat supply, in particular to a slurry waste heat cyclic utilization system.
Background
Thermal power is one of the main power generation modes in China at present, and a thermal power plant generates power by burning coal, oil or natural gas and other fuels. Environmental protection policy requires that thermal power plant need carry out desulfurization treatment to the tail gas after burning, purifies tail gas, reduces the pollution of tail gas to the environment.
The desulfurization treatment can be roughly classified into a wet desulfurization method and a dry desulfurization method, wherein the common wet desulfurization method is to spray the flue gas with calcium carbonate or calcium hydroxide slurry and react with sulfides in the flue gas. Such desulfurization processes are commonly used in power plants. In the wet desulfurization process, the slurry sprays the high-temperature flue gas, the temperature of the slurry can rise, if the slurry is recycled after self-circulation of the slurry, the flue gas temperature after desulfurization is higher by 52-56 ℃, a large amount of moisture can be evaporated, the flue gas dissolves water vapor to enable heat to pass through flue gas emission, energy waste is caused, the flue gas temperature can be reduced through system structure adjustment, white smoke is reduced, and the waste energy is utilized.
In addition, some local policies do not allow small-power electric operation, and direct heating is performed by using steam or hot water boilers, which is also a main reason why high-quality heat energy cannot be efficiently utilized.
Disclosure of Invention
The invention aims to provide a slurry waste heat recycling system which can fully utilize high-quality heat energy and desulfurized flue gas of steam and reduce energy consumption.
The invention relates to a slurry waste heat recycling system, which comprises a steam power device, a heat pump system, a slurry heat exchange device and a desulfurization system,
the desulfurization system comprises a desulfurization tower and a slurry circulation pipeline, wherein a slurry inlet and a slurry outlet of the slurry circulation pipeline are respectively connected with a slurry inlet and a slurry outlet of the desulfurization tower, an air inlet end and an air outlet end are arranged on the desulfurization tower, and the air inlet end of the desulfurization tower is connected with a flue gas discharge pipeline;
the slurry heat exchange device comprises a slurry inlet, a slurry outlet, a cold water inlet and a hot water outlet, the slurry inlet of the slurry heat exchange device is connected with a slurry circulation pipeline connected with the slurry outlet of the desulfurization tower, the slurry outlet of the slurry heat exchange device is connected with the slurry circulation pipeline connected with the slurry inlet of the desulfurization tower, and the cold water inlet and the hot water outlet of the slurry heat exchange device are respectively connected with a circulation water pipeline;
the heat pump system comprises a compressor, a first heat exchanger, a throttle valve and a second heat exchanger which are sequentially connected, wherein the first heat exchanger and the second heat exchanger respectively exchange heat with circulating water;
the steam power device comprises a steam inlet, a steam outlet and a power output end, the power output end of the steam power device is connected with the compressor, the steam outlet of the steam power device is used for discharging exhaust steam after acting, the exhaust steam enters the heater, and the heater is installed on the outer side of the circulating water pipeline and located between the first heat exchanger and the resident heating water.
The invention relates to a slurry waste heat recycling system, wherein a slurry circulating pump is connected to a slurry circulating pipeline.
The slurry waste heat recycling system is characterized in that an output end is arranged on the desulfurizing tower, and the output end is connected with a desulfurizing byproduct conveying pump and a precipitation fan.
The slurry waste heat recycling system comprises a desulfurization tower, a dust remover, a dust blower, a flue gas exhaust pipe and a flue gas exhaust pipe.
The slurry waste heat recycling system is characterized in that the slurry heat exchange device is a liquid-liquid heat exchange device.
The slurry waste heat recycling system disclosed by the invention is characterized in that the heat exchange load of the slurry heat exchange device to a 130t/h coal-fired boiler is 12.6 MW.
The slurry waste heat recycling system comprises a first heat exchanger, a second heat exchanger and a third heat exchanger.
The slurry waste heat recycling system is characterized in that the second heat exchanger is an evaporator.
The slurry waste heat recycling system is characterized in that a heating circulating pump is arranged on the circulating water pipeline.
The slurry waste heat recycling system is characterized in that the steam power device is a steam turbine.
The slurry waste heat recycling system is different from the prior art in that the slurry waste heat recycling system utilizes flue gas waste heat through slurry heat exchange, and utilizes a steam power device, such as a steam turbine heat pump, to improve the temperature of heating water. Meanwhile, the steam power device can further improve the temperature of the heating water through the heater and can be connected with a circulating water heating system in parallel for operation.
The slurry waste heat recycling system heats circulating water for three times through the steam power device, the heat pump system and the slurry heat exchange device, wherein high-temperature slurry is used for flue gas heat exchange by the desulfurization system during primary heating, the high-temperature slurry passes through the heat pump system during secondary heating, and exhausted steam is exhausted by the steam power device driving the heat pump system during tertiary heating. Through the three times of heating, the water temperature is gradually improved, and finally the circulating water meets the condition of resident heating. In the process of heating the circulating water, the energy consumed by heating at every time is less, and heat and exhaust steam in the flue gas can be effectively utilized, so that the energy required by heating is further reduced, the utilization rate of the energy is improved, and the waste is reduced.
The slurry waste heat recycling system of the invention is further explained with reference to the attached drawings.
Drawings
FIG. 1 is a working schematic diagram of a slurry waste heat recycling system of the present invention;
the notation in the figures means: 1-a steam power plant; 2-a heater; 3-a first heat exchanger; 4-a desulfurization byproduct transfer pump; 5-a precipitation fan; 6-a desulfurizing tower; 7-a draught fan; 8-a dust remover; 9-a soot blower; 10-slurry heat exchange means; 11-slurry circulation pump; 12-a heating circulation pump; 13-a second heat exchanger; 14-a throttle valve; 15-compressor.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, the slurry waste heat recycling system of the present invention includes a steam power device 1, a heat pump system, a slurry heat exchange device 10 and a desulfurization system.
The desulfurization system adopts the slurry to humidify, cool and desulfurize the flue gas, and obtains high-temperature slurry and desulfurization byproducts. The desulfurization system comprises a desulfurization tower 6 and a slurry circulation pipeline. The slurry inlet and the slurry outlet of the slurry circulating pipeline are respectively connected with the slurry inlet and the slurry outlet of the desulfurizing tower 6, and the slurry circulating pipeline is connected with a slurry circulating pump 11. The slurry circulating pump 11 is used for driving the slurry in the slurry circulating pipeline to move.
And an air inlet end, an air outlet end and an output end are arranged on the desulfurizing tower 6. The air inlet end of the desulfurizing tower 6 is connected with the air outlet of the draught fan 7, the draught fan 7 can drive high-temperature flue gas to enter the desulfurizing tower 6, and the air inlet of the draught fan 7 is connected with the air outlet of the dust remover 8. An air inlet of the dust remover 8 is connected with an air outlet of the soot blower 9, and the dust remover 8 is used for cleaning dust in flue gas. The soot blower 9 is used for cleaning dust accumulated on the inner wall of the pipeline, the temperature of the inner wall of the pipeline is prevented from rising due to dust accumulation, and an air inlet of the soot blower 9 is connected with a flue gas discharge pipeline. The air outlet end of the desulfurizing tower 6 is used for discharging the treated flue gas, the low-temperature desulfurized flue gas is discharged outside the equipment, and the temperature of the discharged flue gas is 35 ℃. The output of desulfurizing tower 6 is connected with desulfurization by-product delivery pump 4 and precipitation fan 5, and desulfurization by-product delivery pump 4 is used for discharging the by-product after the desulfurization is handled, and precipitation fan 5 is used for accelerating the deposit of by-product.
The slurry heat exchange device 10 is used for exchanging heat for the slurry discharged from the desulfurization tower 6 after desulfurization treatment, and the slurry heat exchange device 10 is a liquid-liquid heat exchange device. In this example, the heat exchange duty of slurry heat exchange device 10 was 12.6MW for a 130t/h coal fired boiler.
The slurry heat exchange device 10 includes a slurry inlet, a slurry outlet, a cold water inlet, and a hot water outlet. The slurry inlet of the slurry heat exchange device 10 is connected with a slurry circulation pipeline connected with the slurry outlet of the desulfurizing tower 6, a valve is arranged on the slurry circulation pipeline, and the slurry outlet of the slurry heat exchange device 10 is connected with the slurry circulation pipeline connected with the slurry inlet of the desulfurizing tower 6. Wherein the temperature of the slurry before entering the slurry heat exchange device 10 is 50 ℃, the temperature of the slurry after heat exchange by the slurry heat exchange device 10 is 35 ℃, the temperature of the slurry for cooling the flue gas is satisfied again, and the slurry enters the desulfurizing tower 6 for next circulation. The cold water inlet and the hot water outlet of the slurry heat exchange device 10 are respectively connected with a pipeline of circulating water, and valves are respectively arranged on the connected pipelines, wherein the water temperature at the cold water inlet of the slurry heat exchange device 10 is 30 ℃, and the water temperature at the hot water outlet of the slurry heat exchange device 10 is 45 ℃. After being treated by the slurry heat exchange device 10, the circulating water is heated once, and the temperature is not enough for heating residents.
The heat pump system comprises a compressor 15, a first heat exchanger 3, a throttle valve 14 and a second heat exchanger 13. The compressor 15 is used for pressurizing the flowing of the heat exchange medium, the outlet of the compressor 15 is connected with the inlet of the first heat exchanger 3, the first heat exchanger 3 exchanges heat with the circulating water pipeline, and the water with the temperature of 45 ℃ flowing out from the hot water outlet of the slurry heat exchange device 10 is heated to 50 ℃ for the second time. The outlet of the first heat exchanger 3 is connected with the inlet of the throttle valve 14, the outlet of the throttle valve 14 is connected with the inlet of the second heat exchanger 13, the second heat exchanger 13 exchanges heat with a circulating water pipeline, circulating water subjected to heating of residents is cooled to 30 ℃ from 35 ℃, and the circulating water subjected to heat exchange at 30 ℃ enters the cold water inlet of the slurry heat exchange device 10 after passing through the heating circulating pump 12. In this embodiment, the first heat exchanger 3 is a condenser, and the second heat exchanger 13 is an evaporator.
The steam power device 1 comprises a steam inlet, a steam outlet and a power output end. In this embodiment, the steam power plant 1 is a steam turbine. The heat pump system is a heat pump compressor system driven by a steam turbine. The steam inlet of the steam power device 1 introduces high-temperature and high-pressure steam for the steam power device 1 to do work outwards. The power output end of the steam power device 1 is connected with the compressor 15 to provide power for the compressor 15. The steam outlet of the steam power device 1 is used for discharging dead steam after acting, the dead steam enters the heater 2, and the heater 2 is arranged on the outer side of the circulating water pipeline and is positioned between the first heat exchanger 3 and the resident heating water. The heater 2 is used for heating circulating water for three times to increase the water temperature from 50 ℃ to 55 ℃. The flow rate of 720t/h and the water temperature of 55 ℃ can meet the requirement of heating water for residents of 40 ten thousand square meters. The heat exchange load of the resident heating process is 16.8MW, and the water temperature after heating is reduced from 55 ℃ to 35 ℃.
The slurry waste heat recycling system utilizes the flue gas waste heat through slurry heat exchange, utilizes a steam power device such as a steam turbine heat pump, converts steam into high-quality kinetic energy by driving the steam turbine to do work, and the steam turbine is directly connected with the heat pump compressor to operate, so that the high-quality heat energy is fully utilized, the temperature of heating water is increased, and the energy utilization efficiency is improved. Meanwhile, the steam power device can further improve the temperature of the heating water through the heater and can be connected with a circulating water heating system in parallel for operation.
The slurry waste heat recycling system heats circulating water for three times through the steam power device, the heat pump system and the slurry heat exchange device, wherein high-temperature slurry is used for flue gas heat exchange by the desulfurization system during primary heating, the high-temperature slurry passes through the heat pump system during secondary heating, and exhausted steam is exhausted by the steam power device driving the heat pump system during tertiary heating. Through the three times of heating, the water temperature is gradually improved, and finally the circulating water meets the condition of resident heating. The heat pump compressor is driven by the steam power device without being driven by a motor, so that electricity is saved and the running cost is reduced. In the process of heating the circulating water, the energy consumed by heating at every time is less, and heat and exhaust steam in the flue gas can be effectively utilized, so that the energy required by heating is further reduced, the utilization rate of the energy is improved, and the waste is reduced. The temperature of the slurry is reduced by the heat exchange device, the low-temperature slurry is in countercurrent contact with the flue gas, the temperature and humidity of the flue gas are reduced, the white smoke is reduced,
although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The utility model provides a thick liquid waste heat cyclic utilization system which characterized in that: comprises a steam power device, a heat pump system, a slurry heat exchange device and a desulfurization system,
the desulfurization system comprises a desulfurization tower and a slurry circulation pipeline, wherein a slurry inlet and a slurry outlet of the slurry circulation pipeline are respectively connected with a slurry inlet and a slurry outlet of the desulfurization tower, an air inlet end and an air outlet end are arranged on the desulfurization tower, and the air inlet end of the desulfurization tower is connected with a flue gas discharge pipeline;
the slurry heat exchange device comprises a slurry inlet, a slurry outlet, a cold water inlet and a hot water outlet, the slurry inlet of the slurry heat exchange device is connected with a slurry circulation pipeline connected with the slurry outlet of the desulfurization tower, the slurry outlet of the slurry heat exchange device is connected with the slurry circulation pipeline connected with the slurry inlet of the desulfurization tower, and the cold water inlet and the hot water outlet of the slurry heat exchange device are respectively connected with a circulation water pipeline;
the heat pump system comprises a compressor, a first heat exchanger, a throttle valve and a second heat exchanger which are sequentially connected, wherein the first heat exchanger and the second heat exchanger respectively exchange heat with circulating water;
the steam power device comprises a steam inlet, a steam outlet and a power output end, the power output end of the steam power device is connected with the compressor, the steam outlet of the steam power device is used for discharging exhaust steam after acting, the exhaust steam enters the heater, and the heater is installed on the outer side of the circulating water pipeline and located between the first heat exchanger and the resident heating water.
2. The slurry waste heat recycling system according to claim 1, characterized in that: and the slurry circulating pipeline is connected with a slurry circulating pump.
3. The slurry waste heat recycling system according to claim 1, characterized in that: the desulfurizing tower is provided with an output end, and the output end is connected with a desulfurizing byproduct conveying pump and a precipitation fan.
4. The slurry waste heat recycling system according to claim 1, characterized in that: the air inlet end of the desulfurizing tower is connected with an air outlet of an induced draft fan, an air inlet of the induced draft fan is connected with an air outlet of a dust remover, an air inlet of the dust remover is connected with an air outlet of a soot blower, and an air inlet of the soot blower is connected with a flue gas discharge pipeline.
5. The slurry waste heat recycling system according to claim 1, characterized in that: the slurry heat exchange device is a liquid-liquid heat exchange device.
6. The slurry waste heat recycling system according to claim 1, characterized in that: the heat exchange load of the slurry heat exchange device on a 130t/h coal-fired boiler is 12.6 MW.
7. The slurry waste heat recycling system according to claim 1, characterized in that: the first heat exchanger is a condenser.
8. The slurry waste heat recycling system according to claim 1 or 7, characterized in that: the second heat exchanger is an evaporator.
9. The slurry waste heat recycling system according to claim 1, characterized in that: and a heating circulating pump is arranged on the circulating water pipeline.
10. The slurry waste heat recycling system according to claim 1, characterized in that: the steam power device adopts a steam turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110587097.0A CN113339872A (en) | 2021-05-27 | 2021-05-27 | Slurry waste heat recycling system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110587097.0A CN113339872A (en) | 2021-05-27 | 2021-05-27 | Slurry waste heat recycling system |
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| CN113339872A true CN113339872A (en) | 2021-09-03 |
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| CN202110587097.0A Pending CN113339872A (en) | 2021-05-27 | 2021-05-27 | Slurry waste heat recycling system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09112211A (en) * | 1995-10-16 | 1997-04-28 | Mitsubishi Heavy Ind Ltd | Thermal power system |
| CN103528113A (en) * | 2013-10-08 | 2014-01-22 | 济南国海能源科技有限公司 | Energy saving system for recycling heat pump waste heat for resident heating and method thereof |
| CN106642278A (en) * | 2016-10-18 | 2017-05-10 | 王清正 | Heat pump and high back pressure combined heat supply system |
| CN107120714A (en) * | 2017-05-18 | 2017-09-01 | 大连理工大学 | A kind of thermal power plant boiler fume afterheat is used for the whole yearization comprehensive utilization energy conserving system of central heating or heating boiler feed water |
| CN210004623U (en) * | 2019-05-07 | 2020-01-31 | 杨艳 | gas boiler heating system capable of deeply recovering flue gas waste heat |
| CN210512728U (en) * | 2019-08-26 | 2020-05-12 | 华能国际电力股份有限公司 | Flue gas waste heat recovery utilizes system after wet flue gas desulfurization |
| CN211537187U (en) * | 2020-01-06 | 2020-09-22 | 山东舜业压力容器有限公司 | Desulfurization slurry waste heat utilization device |
-
2021
- 2021-05-27 CN CN202110587097.0A patent/CN113339872A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09112211A (en) * | 1995-10-16 | 1997-04-28 | Mitsubishi Heavy Ind Ltd | Thermal power system |
| CN103528113A (en) * | 2013-10-08 | 2014-01-22 | 济南国海能源科技有限公司 | Energy saving system for recycling heat pump waste heat for resident heating and method thereof |
| CN106642278A (en) * | 2016-10-18 | 2017-05-10 | 王清正 | Heat pump and high back pressure combined heat supply system |
| CN107120714A (en) * | 2017-05-18 | 2017-09-01 | 大连理工大学 | A kind of thermal power plant boiler fume afterheat is used for the whole yearization comprehensive utilization energy conserving system of central heating or heating boiler feed water |
| CN210004623U (en) * | 2019-05-07 | 2020-01-31 | 杨艳 | gas boiler heating system capable of deeply recovering flue gas waste heat |
| CN210512728U (en) * | 2019-08-26 | 2020-05-12 | 华能国际电力股份有限公司 | Flue gas waste heat recovery utilizes system after wet flue gas desulfurization |
| CN211537187U (en) * | 2020-01-06 | 2020-09-22 | 山东舜业压力容器有限公司 | Desulfurization slurry waste heat utilization device |
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