CN115445403A - Photovoltaic coupling flue gas whitening system and process - Google Patents
Photovoltaic coupling flue gas whitening system and process Download PDFInfo
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 169
- 239000003546 flue gas Substances 0.000 title claims abstract description 169
- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000008569 process Effects 0.000 title claims abstract description 20
- 230000008878 coupling Effects 0.000 title claims abstract description 16
- 238000010168 coupling process Methods 0.000 title claims abstract description 16
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 16
- 230000002087 whitening effect Effects 0.000 title claims description 23
- 239000004065 semiconductor Substances 0.000 claims abstract description 98
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229920002313 fluoropolymer Polymers 0.000 claims abstract description 23
- 238000005057 refrigeration Methods 0.000 claims description 25
- 239000003507 refrigerant Substances 0.000 claims description 17
- 230000017525 heat dissipation Effects 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 15
- 239000002826 coolant Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 11
- 239000000428 dust Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 abstract description 5
- 238000007791 dehumidification Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000010865 sewage Substances 0.000 abstract description 4
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- 238000004056 waste incineration Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000002918 waste heat Substances 0.000 description 6
- 238000000746 purification Methods 0.000 description 5
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- 231100000719 pollutant Toxicity 0.000 description 2
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- 230000005679 Peltier effect Effects 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 238000004378 air conditioning Methods 0.000 description 1
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- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005262 decarbonization Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000000909 electrodialysis Methods 0.000 description 1
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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
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
-
- 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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- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a photovoltaic coupling flue gas de-whitening system and a process, wherein the system is sequentially provided with a fluoroplastic heat exchanger, a wet-process deacidification tower and a primary semiconductor heat exchanger along the flowing direction of raw flue gas; the primary semiconductor heat exchanger is provided with a raw flue gas inlet, a raw flue gas outlet, a clean flue gas inlet and a clean flue gas outlet, and the raw flue gas outlet is connected with the lower part of the fluoroplastic heat exchanger through a demister to form a raw flue gas flowing loop. Has the advantages that: (1) The process does not generate a large amount of dehumidification wastewater, only generates a very small amount of sewage generated by demisting, can directly enter the conventional sewage treatment center, is not recycled, and greatly reduces the operation cost; (2) The process combines a semiconductor couple technology, extracts heat from the raw flue gas and the circulating water to heat the clean flue gas, saves high-grade steam, and reduces the operation cost; (3) The system does not need to be independently built, and can be used for modifying and upgrading the existing equipment, so that the system is low in building cost.
Description
Technical Field
The invention belongs to the technical field of environmental engineering, and relates to a whitening system and a whitening method suitable for a waste incineration power plant, in particular to a photovoltaic coupling flue gas whitening system and a photovoltaic coupling flue gas whitening process.
Background
In order to meet the emission standard of flue gas in a newly-built waste incineration power plant, a wet deacidification process is increasingly used. Saturated wet flue gas from a wet treatment system contains a large amount of water vapor, and the water vapor contains pollutants such as soluble salt, dust and the like. In the environment with lower temperature, in the process of reducing the temperature of the flue gas, the water vapor in the flue gas can be condensed with pollutants to form wet smoke plume, the condition that white smoke and ash smoke are emitted from a chimney is generated, the visual effect is poor, and the adverse effect is generated on the life of surrounding residents. At present, the emission of white smoke is listed as a control index in the emission standard of many provincial and municipal refuse incineration power generation.
At present, the method for removing white pigment in a waste incineration power plant still refers to the process for removing white pigment in a thermal power plant, the method for heating or reheating after condensation has larger consumption of steam and electric energy, and the waste power plant generates too small steam or generated energy compared with a coal-fired power plant due to lower heat value of waste, so that the method is not suitable for consuming a large amount of steam or electric energy to reheat smoke. There is also a method of increasing the de-whitening of the dehumidification part at the tail part of the wet system, but the method can increase a large amount of dehumidification waste water, and the water treatment cost is huge.
Solar energy is abundant and widely used as a renewable energy source, and a solar photovoltaic cell directly converts light energy into electric energy through a photoelectric effect. If distributed photovoltaic power stations are arranged in or around the waste incineration power plant, the generated green clean power can be used for energy consumption of smoke whitening.
The patent with publication number CN111486615B provides a photovoltaic heat pump coupling cascade waste heat utilization and flue gas purification system. The system can provide the electric energy of photovoltaic power generation for the heat pump, and the heat pump provides cold water and carries out primary purification for the flue gas, and then the system has coupled SOx/NOx control and dust collector, has set up conventional heat exchanger and heat pipe again when carrying out flue gas purification, retrieves the waste heat of flue gas and photovoltaic module's used heat, provides the user side and uses, has realized flue gas purification and waste heat recovery's coupling. However, in consideration of the whitening requirements of various places at present, the exhaust gas temperature cannot be reduced to a very low level, so that after the exhaust gas waste heat boiler is utilized, the exhaust gas waste heat cannot be recovered, and the technologies such as lime desulfurization, low-temperature urea denitration and electrostatic dust removal described in the patent cannot be adapted to the current ultra-low emission requirements.
Patent application with publication number CN113209784A provides a flue gas moisture recovery and decarbonization system based on photovoltaic light and heat. The flue gas moisture is recovered by a solution absorption method, and the solution after moisture absorption is subjected to electrodialysis purification regeneration by using electric energy generated by a photovoltaic system. And decarbonizing the flue gas after moisture separation by adopting a membrane method, and recycling the waste heat of the photovoltaic module by recycling the absorption liquid. The system does not consume extra energy, and achieves the purposes of dehydration and decarburization. However, the method of drying the flue gas by using the solution is only suitable for laboratories, and the amount of the flue gas is small; the solution method has poor effect aiming at the large smoke quantity generated by an industrial boiler in dozens of ten thousand square hours, and the smoke can generate a large amount of high-temperature wastewater in a short time after entering the solution despite being subjected to desulfurization and denitrification, thereby bringing higher water treatment cost. In addition, the temperature of the flue gas after the solution is dried is usually only tens of degrees, and the flue gas still needs to consume energy and be heated to the exhaust gas temperature of hundreds of degrees centigrade to be discharged.
The utility model discloses a utility model of publication No. CN211764796U provides a compound attemperator based on photovoltaic power generation and semiconductor refrigeration. The solar vehicle is mainly applied to a vehicle, the photovoltaic panel and the semiconductor refrigeration panel are combined, and under the condition that external power is not needed, electric energy of the photovoltaic panel is supplied to the semiconductor refrigeration panel, heat in the vehicle is absorbed, and the heat is discharged out of the vehicle; the polarity of current input can be changed into heating in the automobile, which is equivalent to the function of an automobile air conditioner. The device has certain energy-saving effect, but has little practical significance.
Similarly, utility model CN216431985U provides an evaporative cooling air conditioning equipment that solar photovoltaic and semiconductor refrigeration combine together. The main application scene is the refrigeration between the fruit vegetables, also combines together photovoltaic board and semiconductor refrigeration board, and the electric energy through the photovoltaic board provides the semiconductor refrigeration board, has reduced the temperature of new trend, combines evaporative cooling system again, further cools down. The cooled fresh air becomes hot air, blows through equipment such as a photovoltaic module, a controller and an inverter, takes away heat of the hot air and is discharged outdoors. Although the device has a certain energy-saving effect, the device has the same practical significance, and the heated airflow scours the photovoltaic module and the control equipment, so that the efficiency of the photovoltaic module is reduced, and the service life of the equipment is also influenced.
The main difficulty in the prior art is how to reduce the operation cost as much as possible in the process of realizing the de-whitening of the flue gas. The mainstream technology of the current smoke whitening in the waste incineration industry is that a dehumidifying part is added on a wet tower, low-temperature dehumidifying water is directly sprayed into smoke to reduce the temperature of the smoke, water vapor in the smoke condenses into water drops on particles in the smoke when meeting cold, and the water drops are intercepted under the scouring action of the dehumidifying water to form dehumidifying wastewater which enters a water treatment center for recycling. In the common whitening project, whitening SGH is added after a wet tower, and the steam extraction is carried out by a steam turbine to further increase the temperature of the discharged smoke. Although the mode ensures better de-whitening effect, the water treatment cost is increased, and high-grade steam is utilized, so that the operation cost is greatly increased, and the development concept of energy conservation and environmental protection of a waste incineration power plant is not met.
Disclosure of Invention
The technical problem to be solved is as follows: in order to overcome the defects of the prior art, the invention needs to solve the problems of energy consumption and cost in the process of removing the white pigment from the waste incineration power plant. On one hand, the invention fully utilizes the vacant field around or inside the waste incineration power plant, and distributes the distributed photovoltaic or photovoltaic building integration to provide power for the white removing system, thereby reducing the cost of extra power supply; on the other hand, the invention utilizes the Peltier effect of the semiconductor material to respectively absorb heat and emit heat at the two ends of the semiconductor couple, thereby realizing the full utilization of the self heat of the flue gas and achieving the purpose of further reducing the energy consumption and the cost in the process of whitening.
The technical scheme is as follows: the system is provided with a fluoroplastic heat exchanger, a wet deacidification tower and a primary semiconductor heat exchanger in sequence along the flowing direction of the raw flue gas; the primary semiconductor heat exchanger is provided with a raw flue gas inlet, a raw flue gas outlet, a clean flue gas inlet and a clean flue gas outlet, the raw flue gas outlet is connected with the lower part of the fluoroplastic heat exchanger through a demister to form a raw flue gas flowing loop, and the upper part of the fluoroplastic heat exchanger is connected with the clean flue gas inlet through a pipeline; the purified flue gas outlet is connected with a secondary semiconductor heat exchanger, an induced draft fan and a chimney in sequence along the flow direction of the purified flue gas; a photovoltaic array is arranged outside the system and is electrically connected with the primary semiconductor heat exchanger and the secondary semiconductor heat exchanger through a DC-DC converter. The photovoltaic array is arranged in or near a factory, a factory roof, an unshielded factory building outer wall, other open spaces in the factory, parking sheds, landscape pools and the like are arranged in a usable site in the factory, the photovoltaic module adopts a monocrystalline silicon or polycrystalline silicon module, the building outer wall can adopt a thin film module, and the installed photovoltaic capacity is improved as much as possible.
Preferably, a semiconductor refrigeration electric pile is arranged in the first-stage semiconductor heat exchanger, the two sides of the electric pile are respectively a low-temperature side and a high-temperature side, the raw flue gas inlet and the raw flue gas outlet are arranged on the low-temperature side, and the clean flue gas inlet and the clean flue gas outlet are arranged on the high-temperature side.
Preferably, a refrigerant pipeline is arranged between the raw flue gas inlet and the raw flue gas outlet, and a refrigerant circulating pump is arranged on the pipeline; a coolant pipeline is arranged between the clean smoke inlet and the clean smoke outlet, and a coolant circulating pump is arranged on the pipeline.
Preferably, the refrigerant pipeline is filled with liquid cooling special heat conducting liquid, and the heat radiator pipeline is filled with heat conducting oil.
Preferably, a semiconductor heat-dissipation electric pile is arranged in the secondary semiconductor heat exchanger, the two sides of the semiconductor heat-dissipation electric pile are respectively provided with a cold end and a hot end, the cold end is provided with a circulating water inlet and a circulating water outlet, and the hot end is provided with a flue gas inlet and a flue gas outlet.
Preferably, a coolant circulating pipeline is arranged between the flue gas inlet and the flue gas outlet, and a coolant circulating pump is arranged on the pipeline.
Preferably, the heat transfer oil is filled in the heat dissipation agent circulation pipeline.
Preferably, the semiconductor refrigeration electric pile and the semiconductor heat dissipation electric pile are formed by combining at least one semiconductor refrigeration piece.
Preferably, the demister is at least one of a high-efficiency wire mesh demister, a ridge demister and an electrostatic demister, and adopts a series mode.
The flue gas de-whitening process of the photovoltaic coupling flue gas de-whitening system comprises the following steps of:
s1, direct current generated by a photovoltaic array is sent to a DC-DC converter through a direct current cable, and voltage is stabilized to be within rated working voltage of a semiconductor refrigeration electric pile and a semiconductor heat dissipation electric pile; the part of electric power does not need to be directly connected to the internet, and if the rest of the whole system is available, energy storage or grid connection treatment can be considered, so that the dehumidifying wastewater treatment link and the steam extraction heating link of the existing scheme can be directly saved, and the running cost of the system is reduced;
the grid connection or energy storage of the electric energy generated by the photovoltaic array can be selected according to the needs, for example, an energy storage system is additionally configured when smoke whitening is required at night, wherein related devices such as an inverter and a transformer are not part of the invention;
s2, conveying the raw flue gas to a fluoroplastic heat exchanger for primary cooling, then entering a wet-process deacidification tower for deacidification, dust fall and secondary cooling, then entering a primary semiconductor heat exchanger through a raw flue gas inlet for further cooling, and enabling the wet flue gas to reach supersaturation and carry liquid drops to enter a demister through a raw flue gas outlet; returning the demisted flue gas to the fluoroplastic heat exchanger;
wherein, in the first-stage semiconductor heat exchanger, the semiconductor refrigeration galvanic pile after the direct current is connected absorbs the heat of the low-temperature side and transfers the heat to the high-temperature side, so as to manufacture a low-temperature environment for the low-temperature side; starting a refrigerant circulating pump to enable heat in the original flue gas to be rapidly transferred to a low-temperature side through a refrigerant pipeline;
s3, the flue gas returned to the fluoroplastic heat exchanger is subjected to primary temperature rise, enters the primary semiconductor heat exchanger through the clean flue gas inlet and is subjected to secondary temperature rise, then is conveyed to the flue gas inlet of the secondary semiconductor heat exchanger through the clean flue gas outlet, is further subjected to temperature rise, is conveyed to the induced draft fan through the flue gas outlet, and is discharged through a chimney;
wherein, in the first-stage semiconductor heat exchanger, a coolant circulating pump is started, so that the heat on the high-temperature side is quickly transferred to the clean flue gas;
in the secondary semiconductor heat exchanger, a circulating water inlet is opened to feed hot water into the heat exchanger, the hot water is discharged through a circulating water outlet after being cooled by a semiconductor heat dissipation galvanic pile, and the absorbed heat is transferred to the hot end of the semiconductor heat dissipation galvanic pile at the moment; and starting a heat-dissipating agent circulating pump to rapidly transfer the heat at the hot end to the flue gas. The source of the circulating water is hot water from a condenser of the waste incineration power plant.
Has the advantages that: (1) In the process of realizing the de-whitening of the flue gas by the process, a large amount of dehumidification wastewater is not generated, and only a very small amount of sewage generated by demisting can directly enter the conventional sewage treatment center and is not recycled, so the operation cost is greatly reduced; (2) The process combines a semiconductor couple technology, and heat is extracted from the raw flue gas and the circulating water to heat the clean flue gas, so that high-grade steam is saved, and the operation cost is reduced; (3) The system does not need to be independently built, and can be used for modifying and upgrading the existing equipment, so that the system is low in building cost.
Drawings
FIG. 1 is a schematic structural diagram of a photovoltaic coupled flue gas whitening system according to the present invention;
FIG. 2 is a schematic structural diagram of a primary semiconductor heat exchanger according to the present invention;
FIG. 3 is a schematic structural view of a secondary semiconductor heat exchanger according to the present invention;
the system comprises a fluoroplastic heat exchanger 1, a wet deacidification tower 2, a first-stage semiconductor heat exchanger 3, a raw flue gas inlet 31, a raw flue gas outlet 32, a clean flue gas inlet 33, a clean flue gas outlet 34, a semiconductor refrigeration electric pile 35, a refrigerant pipeline 36, a heat radiator pipeline 37, a refrigerant circulating pump 38, a heat radiator circulating pump 39, a demister 4, a second-stage semiconductor heat exchanger 5, a flue gas inlet 51, a flue gas outlet 52, a circulating water inlet 53, a circulating water outlet 54, a semiconductor heat radiation electric pile 55, a heat radiator circulating pipeline 56, a heat radiator circulating pump 57, a photovoltaic array 6, a DC-DC converter 7, an induced draft fan 8 and a chimney 9.
Detailed Description
The following examples further illustrate the present invention but are not to be construed as limiting the invention. Modifications and substitutions to methods, procedures, or conditions of the invention may be made without departing from the spirit and substance of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.
Example 1
As shown in fig. 1-3, a photovoltaic coupling flue gas de-whitening system is sequentially provided with a fluoroplastic heat exchanger 1, a wet acid removal tower 2 and a first-stage semiconductor heat exchanger 3 along the flow direction of raw flue gas; the primary semiconductor heat exchanger 3 is provided with a raw flue gas inlet 31, a raw flue gas outlet 32, a clean flue gas inlet 33 and a clean flue gas outlet 34, the raw flue gas outlet 32 is connected with the lower part of the fluoroplastic heat exchanger 1 through a demister 4 to form a raw flue gas flowing loop, and the upper part of the fluoroplastic heat exchanger 1 is connected with the clean flue gas inlet 33 through a pipeline; the clean flue gas outlet 34 is connected with a secondary semiconductor heat exchanger 5, an induced draft fan 8 and a chimney 9 in sequence along the flow direction of the clean flue gas; a photovoltaic array 6 is arranged outside the system, and the photovoltaic array 6 is electrically connected with the primary semiconductor heat exchanger 3 and the secondary semiconductor heat exchanger 5 through a DC-DC converter 7.
The first-stage semiconductor heat exchanger 3 is internally provided with a semiconductor refrigeration electric pile 35, the two sides of the first-stage semiconductor heat exchanger are respectively a low-temperature side and a high-temperature side, a raw flue gas inlet 31 and a raw flue gas outlet 32 are arranged on the low-temperature side, and a clean flue gas inlet 33 and a clean flue gas outlet 34 are arranged on the high-temperature side.
A refrigerant pipeline 36 is arranged between the raw flue gas inlet 31 and the raw flue gas outlet 32, and a refrigerant circulating pump is arranged on the pipeline; a radiator pipeline 37 is arranged between the clean smoke inlet 33 and the clean smoke outlet 34, and a radiator circulating pump 39 is arranged on the pipeline.
The refrigerant pipeline 36 is filled with liquid cooling special heat conducting liquid, and the heat radiator pipeline 37 is filled with heat conducting oil.
A semiconductor heat radiation galvanic pile 55 is arranged in the secondary semiconductor heat exchanger 5, the two sides of the galvanic pile are respectively a cold end and a hot end, the cold end is provided with a circulating water inlet 53 and a circulating water outlet 54, and the hot end is provided with a flue gas inlet 51 and a flue gas outlet 52.
And a coolant circulating pipeline 56 is arranged between the flue gas inlet 51 and the flue gas outlet 52, and a coolant circulating pump 57 is arranged on the pipeline.
The coolant circulation line 56 is filled with heat transfer oil.
The semiconductor refrigeration electric pile 35 and the semiconductor heat dissipation electric pile 55 are formed by combining at least one semiconductor refrigeration piece.
The demister 4 is at least one of a high-efficiency wire mesh demister, a ridge type demister and an electrostatic demister, and adopts a series mode.
The flue gas de-whitening process of the photovoltaic coupling flue gas de-whitening system comprises the following steps:
s1, generating direct current by a photovoltaic array 6, sending the direct current to a DC-DC converter 7 through a direct current cable, and stabilizing the voltage to the rated working voltage of a semiconductor refrigeration electric pile 35 and a semiconductor heat dissipation electric pile 55;
s2, conveying the raw flue gas to a fluoroplastic heat exchanger 1 for primary cooling, then entering a wet-process deacidification tower 2 for deacidification, dust fall and secondary cooling, then entering a primary semiconductor heat exchanger 3 through a raw flue gas inlet 31 for further cooling, and enabling the wet flue gas to reach supersaturation and carry liquid drops to enter a demister 4 through a raw flue gas outlet 32; returning the demisted flue gas to the fluoroplastic heat exchanger 1;
wherein, in the first-stage semiconductor heat exchanger 3, the semiconductor refrigeration galvanic pile 35 after the direct current is connected absorbs the heat of the low-temperature side and transfers the heat to the high-temperature side, so as to manufacture a low-temperature environment for the low-temperature side; starting a refrigerant circulating pump 38 to rapidly transfer heat in the original flue gas to the low-temperature side through a refrigerant pipeline 36;
s3, the flue gas returned to the fluoroplastic heat exchanger 1 is subjected to primary temperature rise, enters the primary semiconductor heat exchanger 3 through the clean flue gas inlet 33 for secondary temperature rise, is sent to a flue gas inlet 51 of the secondary semiconductor heat exchanger 5 through the clean flue gas outlet 34, is further subjected to temperature rise, is sent to the induced draft fan 8 through the flue gas outlet 52, and is discharged through a chimney 9;
wherein, in the first-stage semiconductor heat exchanger 3, a heat-dissipating agent circulating pump 39 is started, so that the heat at the high-temperature side is rapidly transferred to the clean flue gas;
in the secondary semiconductor heat exchanger 5, a circulating water inlet 53 is opened to feed hot water into the heat exchanger, the hot water is discharged through a circulating water outlet 54 after being cooled by a semiconductor heat dissipation electric pile 55, and at the moment, the semiconductor heat dissipation electric pile 55 transfers the absorbed heat to the hot end of the heat dissipation electric pile; the coolant circulation pump 57 is turned on so that the heat at the hot end is quickly transferred to the flue gas.
Example 2
The system and the method in the embodiment 1 are applied to the smoke whitening of the actual waste incineration power plant, and specifically comprise the following steps: according to the common flue gas process of a waste incineration power plant, the rear end of a dust remover is provided with an SCR, a GGH and a wet tower. In the system, the original flue gas temperature at the inlet of a fluoroplastic heat exchanger 1 is 170 ℃, the original flue gas at the outlet is cooled to 110 ℃, the flue gas enters a wet-method deacidification tower 2 for deacidification and dust reduction, the flue gas temperature at the outlet of the tower is reduced to 60 ℃, the flue gas temperature is not reduced to the wet flue gas saturation temperature at the moment, the flue gas enters a first-stage semiconductor heat exchanger 3 for further cooling to 40 ℃, the wet flue gas is supersaturated, a large amount of liquid drops enter a demister 4, the demisted flue gas enters the fluoroplastic heat exchanger 1 for heating to 100 ℃, then enters the hot end of the first-stage semiconductor heat exchanger 3 for heating, and the temperature can reach 120 ℃ after heating. Then the smoke enters a secondary semiconductor heat exchanger 5 to be further heated to 130-140 ℃, enters a chimney 9 through an induced draft fan 8 to be discharged, and white smoke of the demisted smoke disappears.
The electric energy of the primary semiconductor heat exchanger 3 and the secondary semiconductor heat exchanger 5 in the system is provided by the photovoltaic array 6, and direct current generated by the photovoltaic array 6 is transmitted to the DC-DC converter 7 through a direct current cable, so that the voltage is stabilized to be within the rated working voltage of the semiconductor refrigeration electric pile 35 and the semiconductor heat dissipation electric pile 55. The photovoltaic array 6 is arranged inside or near a factory, a factory roof, an unshielded factory building outer wall, other open spaces inside the factory, parking sheds, landscape pools and the like are arranged in a place which can be utilized inside the factory, the photovoltaic module adopts a monocrystalline silicon or polycrystalline silicon module, the building outer wall can adopt a thin film module, and the installed photovoltaic capacity is improved as much as possible.
Claims (10)
1. The photovoltaic coupling flue gas de-whitening system is characterized in that a fluoroplastic heat exchanger (1), a wet-process acid removal tower (2) and a primary semiconductor heat exchanger (3) are sequentially arranged in the flow direction of the original flue gas; the primary semiconductor heat exchanger (3) is provided with a raw flue gas inlet (31), a raw flue gas outlet (32), a clean flue gas inlet (33) and a clean flue gas outlet (34), the raw flue gas outlet (32) is connected with the lower part of the fluoroplastic heat exchanger (1) through a demister (4) to form a raw flue gas flow loop, and the upper part of the fluoroplastic heat exchanger (1) is connected with the clean flue gas inlet (33) through a pipeline; the purified flue gas outlet (34) is sequentially connected with a secondary semiconductor heat exchanger (5), an induced draft fan (8) and a chimney (9) along the flow direction of the purified flue gas; the system is externally provided with a photovoltaic array (6), and the photovoltaic array (6) is electrically connected with the primary semiconductor heat exchanger (3) and the secondary semiconductor heat exchanger (5) through a DC-DC converter (7).
2. The photovoltaic coupling flue gas whitening system according to claim 1, wherein a semiconductor refrigeration electric pile (35) is arranged in the primary semiconductor heat exchanger (3), the two sides of the semiconductor refrigeration electric pile are respectively a low-temperature side and a high-temperature side, the raw flue gas inlet (31) and the raw flue gas outlet (32) are arranged on the low-temperature side, and the clean flue gas inlet (33) and the clean flue gas outlet (34) are arranged on the high-temperature side.
3. The photovoltaic coupling flue gas whitening system according to claim 2, wherein a refrigerant pipeline (36) is arranged between the raw flue gas inlet (31) and the raw flue gas outlet (32), and a refrigerant circulating pump is arranged on the pipeline; a coolant pipeline (37) is arranged between the clean flue gas inlet (33) and the clean flue gas outlet (34), and a coolant circulating pump (39) is arranged on the pipeline.
4. The photovoltaic coupling flue gas whitening system according to claim 3, wherein a refrigerant pipeline (36) is filled with a liquid cooling dedicated heat conducting liquid, and a heat radiating agent pipeline (37) is filled with heat conducting oil.
5. The photovoltaic coupling flue gas whitening system according to claim 1, wherein a semiconductor heat dissipation galvanic pile (55) is arranged in the secondary semiconductor heat exchanger (5), the two sides of the secondary semiconductor heat exchanger are respectively a cold end and a hot end, the cold end is provided with a circulating water inlet (53) and a circulating water outlet (54), and the hot end is provided with a flue gas inlet (51) and a flue gas outlet (52).
6. The photovoltaic coupling flue gas whitening system according to claim 5, wherein a coolant circulation pipeline (56) is arranged between the flue gas inlet (51) and the flue gas outlet (52), and a coolant circulation pump (57) is arranged on the pipeline.
7. The photovoltaic coupled flue gas whitening system according to claim 6, wherein a coolant circulating line (56) is filled with heat conducting oil.
8. The photovoltaic coupled flue gas whitening system according to claim 2 or 4, characterized in that the semiconductor refrigeration electric pile (35) and the semiconductor heat dissipation electric pile (55) are each combined by at least one semiconductor refrigeration sheet.
9. The photovoltaic coupled flue gas whitening system according to claim 1, wherein the demister (4) is at least one of a high-efficiency wire mesh demister, a ridge demister, and an electrostatic demister, and adopts a series mode.
10. The flue gas de-whitening process of a photovoltaic-coupled flue gas de-whitening system of claim 1, characterized in that the process comprises the steps of:
s1, generating direct current by a photovoltaic array (6), sending the direct current to a DC-DC converter (7) through a direct current cable, and stabilizing the voltage to be within rated working voltage of a semiconductor refrigeration electric pile (35) and a semiconductor heat dissipation electric pile (55);
s2, conveying the raw flue gas to a fluoroplastic heat exchanger (1) for primary cooling, then entering a wet-method deacidification tower (2) for deacidification, dust fall and secondary cooling, then entering a primary semiconductor heat exchanger (3) through a raw flue gas inlet (31) for further cooling, and enabling the wet flue gas to reach supersaturation and carry liquid drops to enter a demister (4) through a raw flue gas outlet (32); returning the demisted flue gas to the fluoroplastic heat exchanger (1);
wherein, in the first-stage semiconductor heat exchanger (3), the semiconductor refrigeration galvanic pile (35) after the direct current is connected absorbs the heat of the low-temperature side and transfers the heat to the high-temperature side, so as to manufacture a low-temperature environment for the low-temperature side; starting a refrigerant circulating pump (38) to enable heat in the original flue gas to be rapidly transferred to a low-temperature side through a refrigerant pipeline (36);
s3, the flue gas returned to the fluoroplastic heat exchanger (1) is subjected to primary temperature rise, enters the primary semiconductor heat exchanger (3) through the clean flue gas inlet (33) for secondary temperature rise, is sent to the flue gas inlet (51) of the secondary semiconductor heat exchanger (5) through the clean flue gas outlet (34), is further subjected to temperature rise, is sent to the induced draft fan (8) through the flue gas outlet (52), and is discharged through the chimney (9);
wherein, in the first-stage semiconductor heat exchanger (3), a heat-radiating agent circulating pump (39) is started, so that the heat at the high-temperature side is quickly transferred to the clean flue gas;
in the secondary semiconductor heat exchanger (5), a circulating water inlet (53) is opened to feed hot water into the heat exchanger, the hot water is discharged through a circulating water outlet (54) after being cooled by a semiconductor heat-radiating electric pile (55), and at the moment, the semiconductor heat-radiating electric pile (55) transfers absorbed heat to the hot end of the heat-radiating electric pile; and starting a radiator circulating pump (57) to rapidly transfer heat at the hot end to the flue gas.
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|---|---|---|---|---|
| US5480619A (en) * | 1994-06-28 | 1996-01-02 | The Babcock & Wilcox Company | Regenerative scrubber application with condensing heat exchanger |
| US6273940B1 (en) * | 1994-09-12 | 2001-08-14 | The Babcock & Wilcox Company | Mist elimination/air toxic control in a wet scrubber using a condensing heat exchanger |
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| CN213272679U (en) * | 2020-09-10 | 2021-05-25 | 上海康恒环境股份有限公司 | Ultra-low emission low-temperature white-removing system for waste incineration flue gas |
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2022
- 2022-09-19 CN CN202211138010.2A patent/CN115445403A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5480619A (en) * | 1994-06-28 | 1996-01-02 | The Babcock & Wilcox Company | Regenerative scrubber application with condensing heat exchanger |
| US6273940B1 (en) * | 1994-09-12 | 2001-08-14 | The Babcock & Wilcox Company | Mist elimination/air toxic control in a wet scrubber using a condensing heat exchanger |
| CN107990696A (en) * | 2017-12-25 | 2018-05-04 | 广东富信科技股份有限公司 | Semiconductor thermoelectric drying system and dehumidification equipment |
| CN208704475U (en) * | 2018-08-21 | 2019-04-05 | 洛阳格林环保工程有限公司 | A kind of flue gas for coking industry wet desulphurization takes off white system |
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