CN111336540A - Spraying direct contact type high-temperature flue gas waste heat recovery system and method - Google Patents
Spraying direct contact type high-temperature flue gas waste heat recovery system and method Download PDFInfo
- Publication number
- CN111336540A CN111336540A CN202010196116.2A CN202010196116A CN111336540A CN 111336540 A CN111336540 A CN 111336540A CN 202010196116 A CN202010196116 A CN 202010196116A CN 111336540 A CN111336540 A CN 111336540A
- Authority
- CN
- China
- Prior art keywords
- flue gas
- water
- temperature
- water supply
- hot water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- 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
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2217/00—Intercepting solids
- F23J2217/10—Intercepting solids by filters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a spraying direct contact type high-temperature flue gas waste heat recovery system and a method, and the system comprises a chimney, a dust remover, a desulfurization device, an induced draft fan, a spraying direct contact type heat exchanger, a dosing pump, a filtering device, a bottom sewage pump, a hot water supply tank, a hot water supply pump and a circulating spraying pump, wherein the high-temperature flue gas is subjected to heat exchange with normal-temperature water in the spraying direct contact type heat exchanger, the temperature of the high-temperature flue gas is reduced to 85-95 ℃, and then the high-temperature flue gas is discharged from the chimney after being dedusted by the dust remover and desulfurized by the; meanwhile, the water after heat exchange enters a hot water supply tank after being neutralized by the PH value and filtered by impurities, and supplies heat for users of a heat supply network when the temperature of the water in the hot water supply tank reaches 80-90 ℃; thereby can effectively carry out recycle to the waste heat of flue gas, reduce boiler exhaust gas heat loss by a wide margin, increase the thermal efficiency of boiler, finally realize reducing cost in business and energy-concerving and environment-protective purpose.
Description
Technical Field
The invention relates to a flue gas waste heat recovery system and a method, in particular to a spraying direct contact type high-temperature flue gas waste heat recovery system and a method.
Background
In petrochemical and power production, high-temperature flue gas generated by a boiler is generally required to heat a process medium or generate high-temperature high-pressure steam. The high-temperature flue gas from the boiler firstly passes through high-temperature heat exchange equipment to heat a process medium or generate high-temperature high-pressure steam, then the process medium is heated or the medium-temperature steam is generated in medium-temperature heat exchange equipment, finally the high-temperature flue gas enters low-temperature heat exchange equipment to preheat combustion-supporting air, and the temperature of the high-temperature flue gas is reduced to 130-150 ℃ and finally discharged to the ambient atmosphere through a chimney. Due to the fact that the temperature of the discharged flue gas is too high, the thermal efficiency of the boiler is reduced, waste heat is directly wasted, and a large amount of fuel is consumed; but also the surrounding atmospheric environment.
Therefore, the coal-fired enterprises in China generally face the technical problem of reducing the heat loss of boiler exhaust gas more economically and efficiently and improving the heat efficiency of the boiler. In order to solve the problems, a comprehensive flue gas waste heat recycling system which can meet the requirements of simple equipment, economy and energy conservation is urgently needed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a spraying direct contact type high-temperature flue gas waste heat recovery system and a spraying direct contact type high-temperature flue gas waste heat recovery method, which are convenient to implement and can reduce the temperature of flue gas to be below 95 ℃, so that the waste heat of the flue gas is effectively recycled, the heat efficiency of a boiler is increased, and the aims of reducing enterprise cost, saving energy and protecting environment are finally fulfilled.
In order to achieve the purpose, the invention adopts the technical scheme that: a spray direct contact type high-temperature flue gas waste heat recovery system comprises a chimney, a dust remover, a desulphurization device, an induced draft fan, a spray direct contact type heat exchanger, a dosing pump, a filtering device, a bottom sewage pump, a hot water supply tank, a hot water supply pump and a circulating spray pump,
the outlet of the flue at the tail part of the boiler is connected with the flue gas inlet of the spraying direct contact type heat exchanger through a main flue gas pipeline, the top of the spraying direct contact type heat exchanger is provided with a flue gas outlet, two ends of a flue gas branch pipeline are respectively connected with the flue gas inlet and the flue gas outlet of the spraying direct contact type heat exchanger, the flue gas outlet of the spraying direct contact type heat exchanger is connected with the flue gas inlet of a dust remover, the flue gas outlet of the dust remover is connected with the gas inlet end of an induced draft fan, the gas outlet end of the induced draft fan is connected with the gas inlet end of a desulfurization device;
the lower parts of the two sides of the spraying direct contact type heat exchanger are symmetrically provided with a dosing port and a hot water outlet, and the output end of the dosing pump is connected with the dosing port of the spraying direct contact type heat exchanger; a hot water outlet of the spraying direct contact type heat exchanger is connected with one end of a filtering device, and the other end of the filtering device is connected with a water inlet of a hot water supply tank; a bottom sewage draining port is formed in the bottom of the spraying direct contact type heat exchanger and is connected with an inlet of a bottom sewage pump, and an outlet of the bottom sewage pump and a sewage draining port of the filtering device are connected with the chemical reaction sedimentation tank; the water inlet cleaning port of the filtering device is connected with a flushing water pipeline; a water supply port of the hot water supply tank supplies heat for a user of a heat supply network through a hot water supply pump and a water supply pipeline, and hot water after heat exchange enters the hot water supply tank from a water return port through a water return pipeline; the water inlet end of the circulating spray pump is connected with a circulating water outlet at the top of the hot water supply tank, the water outlet end of the circulating spray pump is connected with a circulating water inlet of the spraying direct contact type heat exchanger, a plurality of nozzles are arranged in the spraying direct contact type heat exchanger, and the plurality of nozzles are all connected with the circulating water inlet;
the flue gas branch pipeline and the flue gas main pipeline between the spraying direct contact type heat exchangers are provided with a stop valve I, the flue gas branch pipeline is provided with a stop valve II, and a stop valve III is arranged on the pipeline between the flue gas outlet of the spraying direct contact type heat exchanger and the flue gas inlet of the dust remover.
Furthermore, the filtering device is formed by connecting two filter screen type filters in parallel.
Furthermore, a water replenishing port is formed in the top of the hot water supply tank and is connected with a water replenishing pipeline.
A recovery method of a spraying direct contact type high-temperature flue gas waste heat recovery system comprises the following specific steps:
A. normal-temperature water is injected into the hot water supply tank through a water supply pipeline and a water supply port, and a circulating spray pump is started to ensure that the normal-temperature water in the hot water supply tank continuously passes through a circulating water inlet and then is sprayed out through a plurality of nozzles to enter a spray direct-contact heat exchanger;
B. opening the stop valve I and the stop valve III and then closing the stop valve II, wherein high-temperature flue gas discharged by the boiler is at the temperature of 130-150 ℃ and enters the spraying direct contact type heat exchanger through the flue gas main pipeline and the stop valve I;
C. the normal-temperature water falls in the spraying direct-contact heat exchanger in a atomizing manner and carries out convection direct-contact heat exchange with the high-temperature flue gas flowing through the spraying direct-contact heat exchanger, so that the normal-temperature water falls to the bottom of the spraying direct-contact heat exchanger after the temperature of the normal-temperature water is raised, and meanwhile, the temperature of the high-temperature flue gas is reduced; at the moment, the temperature of the high-temperature flue gas after heat exchange is reduced to 85-95 ℃, then the flue gas enters a dust remover for dust removal, then enters a desulfurization device through an induced draft fan for desulfurization, and then is discharged from a chimney; simultaneously, after heat exchange, the water temperature is increased to 80-90 ℃, a dosing pump is started to add sodium hydroxide into the water, the PH value and impurity precipitation of the water after heat exchange are neutralized, and the upper layer clean hot water is filtered by a filtering device and then enters a hot water supply tank; the water in the water supply tank passes through the circulating spray pump again and is sprayed out from the plurality of nozzles for heat exchange again, and the circulation is carried out;
D. when the temperature of water in the water supply and heating tank reaches 80-90 ℃, starting a water supply and heating pump, supplying heat to users of a heat supply network by hot water in the water supply and heating tank, reducing the temperature of the water to 30-40 ℃ after heat exchange, and then returning the water to the water supply and heating tank from a water return port through a water return pipeline;
E. the bottom sewage pump is started at regular time in the processes of flue gas cooling and waste heat heating, the impurity-containing waste liquid precipitated at the bottom in the spraying direct contact type heat exchanger is conveyed to a chemical reaction sedimentation tank, and the impurity-containing waste liquid is recycled as industrial water after being crystallized and precipitated in the chemical reaction sedimentation tank; in addition, sludge at the bottom of the furnace enters a hearth through a desliming machine for blending combustion;
F. the processes of flue gas cooling and waste heat heating are continuously carried out, water is supplemented to the hot water supply tank through the water supplementing pipeline, and the liquid level of the hot water supply tank is ensured to meet the requirement;
G. carry out flue gas cooling and waste heat heating in-process, regularly wash filter equipment, specifically be: closing a valve of one path of filter screen type filter in the filter device, flushing cleaning water into the filter device through a flushing water pipeline, flushing the path of filter screen type filter by the cleaning water, and conveying the water with impurities into a chemical reaction sedimentation tank from an impurity discharge port of the filter device to finish the primary cleaning of the path of filter screen type filter; and then opening the valve of the filter screen type filter, closing the valve of the other filter screen type filter, repeating the cleaning process, and alternately cleaning the two filter screen type filters to ensure that the impurities of the hot water are continuously filtered.
Compared with the prior art, the high-temperature flue gas is subjected to heat exchange with normal-temperature water in the spraying direct-contact heat exchanger, the temperature of the high-temperature flue gas is reduced to 85-95 ℃, and then the high-temperature flue gas is discharged from a chimney after being dedusted by the deduster and desulfurized by the desulfurizer; meanwhile, the water after heat exchange enters a hot water supply tank after being neutralized by the PH value and filtered by impurities, and supplies heat for users of a heat supply network when the temperature of the water in the hot water supply tank reaches 80-90 ℃; thereby can effectively carry out recycle to the waste heat of flue gas, reduce boiler exhaust gas heat loss by a wide margin, increase the thermal efficiency of boiler, finally realize reducing cost in business and energy-concerving and environment-protective purpose.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. boiler, 2, flue gas main line, 3, flue gas lateral pipeline, 4, stop valve I, 5, dosing pump, 6, stop valve II, 7, spray direct contact heat exchanger, 8, stop valve III, 9, dust remover, 10, draught fan, 11, desulphurization unit, 12, chimney, 13, bottom dredge pump, 14, chemical reaction sedimentation tank, 15, filter equipment, 16, circulation spray pump, 17, hot water supply tank, 18, confession hot water pump, 19, nozzle.
Detailed Description
The present invention will be further explained below.
As shown in figure 1, the spraying direct contact type high-temperature flue gas waste heat recovery system comprises a chimney 12, a dust remover 9, a desulphurization device 11, an induced draft fan 10, a spraying direct contact type heat exchanger 7, a dosing pump 5, a filtering device 15, a bottom sewage pump 13, a hot water supply pump 17, a hot water supply pump 18 and a circulating spraying pump 16,
the outlet of a flue at the tail part of the boiler 1 is connected with a flue gas inlet of a spraying direct contact type heat exchanger 7 through a main flue gas pipeline 2, the top of the spraying direct contact type heat exchanger 7 is provided with a flue gas outlet, two ends of a flue gas branch pipeline 3 are respectively connected with the flue gas inlet and the flue gas outlet of the spraying direct contact type heat exchanger 7, the flue gas outlet of the spraying direct contact type heat exchanger 7 is connected with the flue gas inlet of a dust remover 9, the flue gas outlet of the dust remover 9 is connected with the gas inlet end of an induced draft fan 10, the gas outlet end of the induced draft fan 10 is connected with the gas inlet end of a desulfurization device 11;
the lower parts of the two sides of the spraying direct contact type heat exchanger 7 are symmetrically provided with a dosing port and a hot water outlet, and the output end of the dosing pump 5 is connected with the dosing port of the spraying direct contact type heat exchanger 7; a hot water outlet of the spraying direct contact type heat exchanger 7 is connected with one end of a filtering device 15, and the other end of the filtering device 15 is connected with a water inlet of a hot water supply tank 17; the bottom of the spraying direct contact type heat exchanger 7 is provided with a bottom sewage draining port, the bottom sewage draining port is connected with an inlet of a bottom sewage draining pump 13, and an outlet of the bottom sewage draining pump 13 and a sewage draining port of a filtering device 15 are both connected with a chemical reaction sedimentation tank 14; a water inlet cleaning port of the filtering device 15 is connected with a flushing water pipeline; a water supply port of the hot water supply tank 17 supplies heat for a heat supply network user through a hot water supply pump 18 and a water supply pipeline, and hot water after heat exchange enters the hot water supply tank 17 from a water return port through a water return pipeline; the water inlet end of the circulating spray pump 16 is connected with a circulating water outlet at the top of the hot water supply tank 17, the water outlet end of the circulating spray pump 16 is connected with a circulating water inlet of the spraying direct contact type heat exchanger 7, a plurality of nozzles 19 are arranged in the spraying direct contact type heat exchanger 7, and the plurality of nozzles 19 are all connected with the circulating water inlet;
flue gas branch pipeline 3 and the flue gas main line 2 that sprays between the direct contact heat exchanger 7 are equipped with stop valve I4, are equipped with stop valve II 6 on the flue gas branch pipeline 3, are equipped with stop valve III 8 on the pipeline between the exhanst gas outlet that sprays direct contact heat exchanger 7 and the flue gas import of dust remover 9.
Further, the filtering device 15 is formed by connecting two filter screen filters in parallel.
Further, a water replenishing port is formed in the top of the hot water supply tank 17 and is connected with a water replenishing pipeline.
Wherein, the chimney 12, the dust remover 9, the desulphurization device 11, the induced draft fan 10, the spraying direct contact type heat exchanger 7, the dosing pump 5, the filtering device 15, the bottom sewage pump 13, the hot water supply tank 17, the hot water supply pump 18 and the circulating spraying pump 16 are all existing equipment.
A recovery method of a spraying direct contact type high-temperature flue gas waste heat recovery system comprises the following specific steps:
A. normal temperature water is injected into the hot water supply tank 17 through a water supply pipeline and a water supply port, and the circulating spray pump 16 is started to ensure that the normal temperature water in the hot water supply tank 17 continuously passes through a circulating water inlet and then is sprayed out through a plurality of nozzles 19 to enter the spray direct-contact heat exchanger 7;
B. after the stop valve I4 and the stop valve III 8 are opened, the stop valve II 6 is closed, and at the moment, high-temperature flue gas with the temperature of 130-150 ℃ discharged by the boiler 1 enters the spraying direct-contact heat exchanger 7 through the flue gas main pipeline 2 and the stop valve I4;
C. the normal-temperature water falls in the spraying direct-contact heat exchanger 7 in a atomizing manner and carries out convection direct-contact heat exchange with the high-temperature flue gas flowing through the spraying direct-contact heat exchanger 7, so that the temperature of the normal-temperature water is raised and then falls to the bottom of the spraying direct-contact heat exchanger 7, and meanwhile, the temperature of the high-temperature flue gas is lowered; at the moment, the temperature of the high-temperature flue gas after heat exchange is reduced to 85-95 ℃, then the flue gas enters a dust remover 9 for dust removal, then enters a desulfurization device 11 through a draught fan 10 for desulfurization, and then is discharged from a chimney 12; meanwhile, after heat exchange, the water temperature rises to 80-90 ℃, the dosing pump 5 is started to add sodium hydroxide into the water, the PH value and impurity precipitation of the water after heat exchange are neutralized (sulfide and impurities in the flue gas are adsorbed in the process of heat exchange between the water and the flue gas, so that the PH value of the water after heat exchange is reduced, the PH value of the heated water is recovered through the neutralization effect of the added sodium hydroxide, and the heated water is convenient for subsequent use), and the clean hot water at the upper layer is filtered by the filtering device 15 and then enters the hot water supply tank 17; the water in the water supply tank 17 passes through the circulating spraying pump 16 again and is sprayed from the plurality of nozzles 19 for heat exchange again, and the circulation is carried out;
D. when the temperature of water in the hot water supply tank 17 reaches 80-90 ℃, the hot water supply pump 18 is started, hot water in the hot water supply tank 17 supplies heat to users of a hot network, the temperature of the water is reduced to 30-40 ℃ after heat exchange, and then the water returns to the hot water supply tank 17 from a water return port through a water return pipeline;
E. the bottom sewage pump 13 is started at regular time in the processes of flue gas cooling and waste heat heating, the impurity-containing waste liquid precipitated at the bottom in the spraying direct contact type heat exchanger 7 is conveyed to a chemical reaction sedimentation tank, and the impurity-containing waste liquid is recycled as industrial water after being crystallized and precipitated in the chemical reaction sedimentation tank; in addition, sludge at the bottom of the furnace enters a hearth through a desliming machine for blending combustion;
F. the processes of flue gas cooling and waste heat heating are continuously carried out, water is supplemented to the hot water supply tank 17 through a water supplementing pipeline, and the liquid level of the hot water supply tank 17 is ensured to meet the requirement;
G. in the flue gas cooling and waste heat heating process, regularly wash filter equipment 15, specifically be: closing a valve of one path of filter screen type filter in the filter device 15, flushing cleaning water into the filter device 15 through a flushing water pipeline, flushing the path of filter screen type filter by the cleaning water, and conveying water with impurities into the chemical reaction sedimentation tank 14 from an impurity discharge port of the filter device 15 to finish the primary cleaning of the path of filter screen type filter; and then opening the valve of the filter screen type filter, closing the valve of the other filter screen type filter, repeating the cleaning process, and alternately cleaning the two filter screen type filters to ensure that the impurities of the hot water are continuously filtered.
Claims (4)
1. A spray direct contact type high-temperature flue gas waste heat recovery system comprises a chimney, a dust remover, a desulphurization device and a draught fan, and is characterized by also comprising a spray direct contact type heat exchanger, a dosing pump, a filtering device, a bottom sewage pump, a hot water supply tank, a hot water supply pump and a circulating spray pump,
the outlet of the flue at the tail part of the boiler is connected with the flue gas inlet of the spraying direct contact type heat exchanger through a main flue gas pipeline, the top of the spraying direct contact type heat exchanger is provided with a flue gas outlet, two ends of a flue gas branch pipeline are respectively connected with the flue gas inlet and the flue gas outlet of the spraying direct contact type heat exchanger, the flue gas outlet of the spraying direct contact type heat exchanger is connected with the flue gas inlet of a dust remover, the flue gas outlet of the dust remover is connected with the gas inlet end of an induced draft fan, the gas outlet end of the induced draft fan is connected with the gas inlet end of a desulfurization device;
the lower parts of the two sides of the spraying direct contact type heat exchanger are symmetrically provided with a dosing port and a hot water outlet, and the output end of the dosing pump is connected with the dosing port of the spraying direct contact type heat exchanger; a hot water outlet of the spraying direct contact type heat exchanger is connected with one end of a filtering device, and the other end of the filtering device is connected with a water inlet of a hot water supply tank; a bottom sewage draining port is formed in the bottom of the spraying direct contact type heat exchanger and is connected with an inlet of a bottom sewage pump, and an outlet of the bottom sewage pump and a sewage draining port of the filtering device are connected with the chemical reaction sedimentation tank; the water inlet cleaning port of the filtering device is connected with a flushing water pipeline; a water supply port of the hot water supply tank supplies heat for a user of a heat supply network through a hot water supply pump and a water supply pipeline, and hot water after heat exchange enters the hot water supply tank from a water return port through a water return pipeline; the water inlet end of the circulating spray pump is connected with a circulating water outlet at the top of the hot water supply tank, the water outlet end of the circulating spray pump is connected with a circulating water inlet of the spraying direct contact type heat exchanger, a plurality of nozzles are arranged in the spraying direct contact type heat exchanger, and the plurality of nozzles are all connected with the circulating water inlet;
the flue gas branch pipeline and the flue gas main pipeline between the spraying direct contact type heat exchangers are provided with a stop valve I, the flue gas branch pipeline is provided with a stop valve II, and a stop valve III is arranged on the pipeline between the flue gas outlet of the spraying direct contact type heat exchanger and the flue gas inlet of the dust remover.
2. The spray direct-contact high-temperature flue gas waste heat recovery system according to claim 1, wherein the filtering device is formed by connecting two filter screen types in parallel.
3. The system for recovering the waste heat of the high-temperature flue gas by direct spray contact according to claim 1, wherein a water replenishing port is formed in the top of the hot water supply tank and is connected with a water replenishing pipeline.
4. The recovery method of the spraying direct-contact high-temperature flue gas waste heat recovery system according to claim 1 is characterized by comprising the following specific steps:
A. normal-temperature water is injected into the hot water supply tank through a water supply pipeline and a water supply port, and a circulating spray pump is started to ensure that the normal-temperature water in the hot water supply tank continuously passes through a circulating water inlet and then is sprayed out through a plurality of nozzles to enter a spray direct-contact heat exchanger;
B. opening the stop valve I and the stop valve III and then closing the stop valve II, wherein high-temperature flue gas discharged by the boiler is at the temperature of 130-150 ℃ and enters the spraying direct contact type heat exchanger through the flue gas main pipeline and the stop valve I;
C. the normal-temperature water falls in the spraying direct-contact heat exchanger in a atomizing manner and carries out convection direct-contact heat exchange with the high-temperature flue gas flowing through the spraying direct-contact heat exchanger, so that the normal-temperature water falls to the bottom of the spraying direct-contact heat exchanger after the temperature of the normal-temperature water is raised, and meanwhile, the temperature of the high-temperature flue gas is reduced; at the moment, the temperature of the high-temperature flue gas after heat exchange is reduced to 85-95 ℃, then the flue gas enters a dust remover for dust removal, then enters a desulfurization device through an induced draft fan for desulfurization, and then is discharged from a chimney; meanwhile, after heat exchange, the water temperature rises to 80-90 ℃, a dosing pump is started to add sodium hydroxide into the water, the PH value and impurity precipitation of the water after heat exchange are neutralized, and the upper layer clean hot water is filtered by a filtering device and then enters a hot water supply tank; the water in the water supply tank passes through the circulating spray pump again and is sprayed out from the plurality of nozzles for heat exchange again, and the circulation is carried out;
D. when the temperature of water in the water supply and heating tank reaches 80-90 ℃, starting a water supply and heating pump, supplying heat to users of a heat supply network by hot water in the water supply and heating tank, reducing the temperature of the water to 30-40 ℃ after heat exchange, and then returning the water to the water supply and heating tank from a water return port through a water return pipeline;
E. the bottom sewage pump is started at regular time in the processes of flue gas cooling and waste heat heating, the impurity-containing waste liquid precipitated at the bottom in the spraying direct contact type heat exchanger is conveyed to a chemical reaction sedimentation tank, and the impurity-containing waste liquid is recycled as industrial water after being crystallized and precipitated in the chemical reaction sedimentation tank; in addition, sludge at the bottom of the furnace enters a hearth through a desliming machine for blending combustion;
F. the processes of flue gas cooling and waste heat heating are continuously carried out, water is supplemented to the hot water supply tank through the water supplementing pipeline, and the liquid level of the hot water supply tank is ensured to meet the requirement;
G. carry out flue gas cooling and waste heat heating in-process, regularly wash filter equipment, specifically be: closing a valve of one path of filter screen type filter in the filter device, flushing cleaning water into the filter device through a flushing water pipeline, flushing the path of filter screen type filter by the cleaning water, and conveying the water with impurities into a chemical reaction sedimentation tank from an impurity discharge port of the filter device to finish the primary cleaning of the path of filter screen type filter; and then opening the valve of the filter screen type filter, closing the valve of the other filter screen type filter, repeating the cleaning process, and alternately cleaning the two filter screen type filters to ensure that the impurities of the hot water are continuously filtered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010196116.2A CN111336540A (en) | 2020-03-19 | 2020-03-19 | Spraying direct contact type high-temperature flue gas waste heat recovery system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010196116.2A CN111336540A (en) | 2020-03-19 | 2020-03-19 | Spraying direct contact type high-temperature flue gas waste heat recovery system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111336540A true CN111336540A (en) | 2020-06-26 |
Family
ID=71180239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010196116.2A Pending CN111336540A (en) | 2020-03-19 | 2020-03-19 | Spraying direct contact type high-temperature flue gas waste heat recovery system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111336540A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112370919A (en) * | 2020-11-09 | 2021-02-19 | 山东岱荣节能环保科技有限公司 | Boiler flue gas waste heat recovery utilizes system |
| CN113865404A (en) * | 2021-09-30 | 2021-12-31 | 北京金房暖通节能技术股份有限公司 | Flue gas waste heat recovery system |
| CN114471026A (en) * | 2021-12-22 | 2022-05-13 | 国能长源武汉青山热电有限公司 | Flue gas purification device for waste heat utilization technology and purification method thereof |
| CN114674159A (en) * | 2022-03-07 | 2022-06-28 | 河南新北方净化设备安装有限公司 | Device treatment method for recycling and purifying waste gas energy of annealing furnace |
| CN115318045A (en) * | 2022-09-01 | 2022-11-11 | 重庆富燃科技股份有限公司 | Device for generating thermoelectric decoupling by pulverized coal combustion flue gas shunting coupling |
-
2020
- 2020-03-19 CN CN202010196116.2A patent/CN111336540A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112370919A (en) * | 2020-11-09 | 2021-02-19 | 山东岱荣节能环保科技有限公司 | Boiler flue gas waste heat recovery utilizes system |
| CN113865404A (en) * | 2021-09-30 | 2021-12-31 | 北京金房暖通节能技术股份有限公司 | Flue gas waste heat recovery system |
| CN114471026A (en) * | 2021-12-22 | 2022-05-13 | 国能长源武汉青山热电有限公司 | Flue gas purification device for waste heat utilization technology and purification method thereof |
| CN114471026B (en) * | 2021-12-22 | 2023-07-14 | 国能长源武汉青山热电有限公司 | Flue gas purification device for waste heat utilization technology and purification method thereof |
| CN114674159A (en) * | 2022-03-07 | 2022-06-28 | 河南新北方净化设备安装有限公司 | Device treatment method for recycling and purifying waste gas energy of annealing furnace |
| CN115318045A (en) * | 2022-09-01 | 2022-11-11 | 重庆富燃科技股份有限公司 | Device for generating thermoelectric decoupling by pulverized coal combustion flue gas shunting coupling |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111336540A (en) | Spraying direct contact type high-temperature flue gas waste heat recovery system and method | |
| CN201050793Y (en) | Boiler high-performance energy-saving dust-removing preheating system | |
| CN110926217B (en) | Yellow phosphorus slag water quenching waste heat recovery device | |
| CN105937765A (en) | Incinerating quenching device used for treatment of high-viscosity and strong-corrosive salt containing waste liquid and incinerating quenching method used for treatment of high viscosity and strong corrosive salt containing waste liquid | |
| CN109945277A (en) | A kind of energy conserving system being used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant | |
| CN212005747U (en) | Spraying direct contact type high-temperature flue gas waste heat recovery system | |
| CN214619599U (en) | Integrated waste liquid incineration boiler | |
| CN204042853U (en) | Steam boiler waste heat reclaims and system for deoxidizing by heat power | |
| CN203546170U (en) | Galvanizing line afterheat utilizing system | |
| CN106016835A (en) | System for recycling fuel gas and flue gas waste heat in multistage mode | |
| CN209997405U (en) | flue gas whitening system for thermal power plant | |
| CN205878185U (en) | That handles that high viscosity highly corrosive contains salt waste liquid burns rapid cooling device | |
| CN212440731U (en) | Energy-saving boiler tail gas clean-up system | |
| CN108424793A (en) | Rich oil de-benzene system and rich oil de-benzene method | |
| CN201311220Y (en) | Automatic soot blowing and decoking waste gas heat recovery device | |
| CN213746819U (en) | Boiler flue gas waste heat recovery device | |
| CN113686190A (en) | System and method for comprehensively recycling and utilizing low-temperature waste heat | |
| CN208832496U (en) | A kind of ventilation air methane oxidation device low-temperature flue gas waste heat utilizes system | |
| CN110093465B (en) | Blast furnace slag flushing steam whitening system and method | |
| CN211936384U (en) | Flue gas denitration and dust removal device for alkali recovery furnace in papermaking industry | |
| CN210624555U (en) | Waste heat recoverer for desulfurized gypsum | |
| CN110132024B (en) | Waste heat utilization and white matter elimination system and method for blast furnace water slag flushing process | |
| CN203286573U (en) | Salty waste water burning system | |
| CN209917589U (en) | Smoke whitening device | |
| CN210057679U (en) | Spraying cooling mixed air de-whitening system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |