CN110260674B - Air cooling system for thermal power plant and control method - Google Patents
Air cooling system for thermal power plant and control method Download PDFInfo
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- CN110260674B CN110260674B CN201910512295.3A CN201910512295A CN110260674B CN 110260674 B CN110260674 B CN 110260674B CN 201910512295 A CN201910512295 A CN 201910512295A CN 110260674 B CN110260674 B CN 110260674B
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- 238000001816 cooling Methods 0.000 title claims abstract description 181
- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 234
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 171
- 239000003546 flue gas Substances 0.000 claims abstract description 171
- 238000005399 mechanical ventilation Methods 0.000 claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 13
- 238000006477 desulfuration reaction Methods 0.000 claims description 28
- 230000023556 desulfurization Effects 0.000 claims description 28
- 238000010521 absorption reaction Methods 0.000 claims description 27
- 239000000428 dust Substances 0.000 claims description 27
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 27
- 230000007613 environmental effect Effects 0.000 claims description 14
- 239000002918 waste heat Substances 0.000 claims description 12
- 239000000779 smoke Substances 0.000 claims description 9
- 229910052815 sulfur oxide Inorganic materials 0.000 claims description 9
- 238000004064 recycling Methods 0.000 claims description 7
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 4
- 230000000875 corresponding effect Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims 2
- 230000005611 electricity Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 239000000284 extract Substances 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000002950 deficient Effects 0.000 description 3
- 239000003077 lignite Substances 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000003809 water extraction Methods 0.000 description 2
- 239000012719 wet electrostatic precipitator Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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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
- B01D53/14—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 by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
-
- 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- 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
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B11/00—Controlling arrangements with features specially adapted for condensers
Abstract
The invention discloses an air cooling system for a thermal power plant and a control method, wherein the air cooling system for the thermal power plant comprises: the indirect cooling tower is provided with a first air inlet and a first air outlet; a first heat exchange device comprising a first heat exchange unit and a second heat exchange unit which operate independently is arranged outside the heat exchanger; the first heat exchange unit is communicated with the gas condenser through a first circulating pipe, and the second heat exchange unit is communicated with the gas condenser through a second circulating pipe provided with a first valve; the mechanical ventilation indirect cooling tower is provided with a second air inlet and a second air outlet, and fans are arranged in the second air inlet or/and the second air outlet; a second heat exchange device is arranged outside the heat exchanger; the flue gas temperature difference water lifting device is positioned in the indirect cooling tower and is communicated with the second heat exchange device through a third circulating pipe provided with a second valve; which is communicated with the second heat exchange unit by a fourth circulating pipe provided with a third valve. The invention provides an air cooling system for a thermal power plant and a control method thereof, which can reduce noise pollution and electricity consumption.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to an air cooling system for a thermal power plant and a control method.
Background
Thermal generator sets are important equipment of thermal power plants. The thermal generator set is a set which uses coal and the like as fuel, heats water in a boiler to increase the temperature, and then pushes a gas turbine to act by using steam with certain pressure to generate electricity. In the operation process, thermal generator group consumes a large amount of water, and usually, 600MW level unit consumes 120 ~ 150 tons of water per hour, and to the region that the water resource is deficient, thermal generator group's development can receive very big restriction.
A certain power plant is in a water resource deficient area, and lignite with large water content is used as fuel, so that the water resource deficient lignite has great significance for water resource recycling in the coal-fired power generation process. Lignite has large moisture, smoke generated after combustion contains a large amount of moisture, particularly, after wet desulphurization, the water content of clean smoke of a 600 MW-level unit is more than 200 tons per hour, and the water is carried by the smoke and discharged into the atmosphere, so that waste of water resources is caused; therefore, the air cooling system for the thermal power plant is adopted to extract water in the clean flue gas, the temperature of the clean flue gas side is reduced by 5-10 ℃, but the water lifting amount can realize zero water supplement of desulfurization and even realize zero water supplement of the power plant. In general, a thermal power generating unit is used in combination with a natural ventilation system to perform cooling, an air cooling system for a thermal power plant is used in combination with a mechanical air supply system to perform cooling, and the mechanical air supply system is likely to generate noise and consumes high power due to the use of an air blower or other equipment.
Therefore, there is a need for an air cooling system and a control method for a thermal power plant to solve the above problems.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an air cooling system and a control method for a thermal power plant, in which a mechanical air supply system and a natural air supply system are used in parallel, and the operating time of the mechanical air supply system is adjusted to reduce annual noise pollution, annual power consumption and energy consumption.
The present invention provides an air cooling system for a thermal power plant, including:
the indirect cooling tower is provided with a first air inlet and a first air outlet; a first heat exchange device opposite to the first air inlet is arranged outside the indirect cooling tower and comprises a first heat exchange unit and a second heat exchange unit which are respectively and independently controlled;
the first heat exchange unit is communicated with the gas condenser through a first circulating pipe, the second heat exchange unit is communicated with the gas condenser through a second circulating pipe, and a water inlet end and a water outlet end of the second circulating pipe are respectively provided with a first valve;
the mechanical ventilation indirect cooling tower is provided with a second air inlet and a second air outlet, and a fan is arranged in the second air inlet or/and the second air outlet; a second heat exchange device opposite to the second air inlet is arranged outside the mechanical ventilation indirect cooling tower;
the flue gas temperature difference water lifting device is positioned in the indirect cooling tower and is communicated with the second heat exchange device through a third circulating pipe, and a water inlet end and a water outlet end of the third circulating pipe are both provided with second valves; the flue gas temperature difference water lifting device is communicated with the second heat exchange unit through a fourth circulating pipe, and a third valve is arranged at the water inlet end and the water outlet end of the fourth circulating pipe.
Preferably, at least one group of flue gas treatment systems is arranged in the indirect cooling tower, and each flue gas treatment system comprises a desulfurization absorption tower, a flue gas temperature difference water lifting device, a dust removal device and a chimney, wherein the desulfurization absorption tower is used for removing sulfur oxides, the flue gas temperature difference water lifting device is used for recovering water, and the desulfurization absorption tower is sequentially communicated with the first air inlet and the first air outlet; the first air inlet is communicated with a boiler hearth; and a flue gas denitration device for removing nitrogen oxides and a flue gas waste heat exchange device for recovering heat are arranged between the boiler furnace and the first air inlet.
Preferably, the flue gas temperature difference water lifting device comprises a flue gas channel and a medium channel which can exchange heat with each other, an inlet and an outlet of the flue gas channel are respectively communicated with the desulfurization absorption tower and the dust removal device, an inlet and an outlet of the medium channel are respectively communicated with a first three-way pipe and a second three-way pipe, one interface of the first three-way pipe is communicated with the inlet of the medium channel, and the other two interfaces of the first three-way pipe are respectively communicated with a water outlet end of the second circulating pipe and a water outlet end of the third circulating pipe; one connector of the second three-way pipe is communicated with the outlet of the medium channel, and the other two connectors of the second three-way pipe are respectively communicated with the water inlet end of the second circulating pipe and the water inlet end of the third circulating pipe.
Preferably, the first heat exchange device further comprises: the support frame, the support frame is along the circumference distribution of indirect cooling tower just along the direction of height of indirect cooling tower extends, first heat exchange unit with second heat exchange unit all through the mounting with the support frame is connected.
The invention also provides a control method of the air cooling system for the thermal power plant, which comprises the following steps:
(1) when the ambient temperature is greater than or equal to the preset temperature, the first heat exchange unit, the condenser and the indirect cooling tower form a first heat exchange cycle; opening a first valve to communicate a second circulation pipe so that a second heat exchange unit, the condenser and the indirect cooling tower form a second heat exchange cycle; opening a second valve to enable a third circulating pipe to be communicated, so that a third heat exchange circulation is formed by the second heat exchange device, the flue gas temperature difference water lifting device and the mechanical ventilation indirect cooling tower; closing the third valve to make the fourth circulating pipe in a closed state;
(2) when the ambient temperature is lower than the preset temperature, the first heat exchange unit, the condenser and the indirect cooling tower form a first heat exchange cycle; closing the first valve so that the second circulation pipe is in a closed state; closing the second valve such that the third circulation passage is closed; and opening the third valve to enable a fourth circulating pipe to be communicated, so that the second heat exchange unit, the flue gas temperature difference water lifting device and the indirect cooling tower form a fourth heat exchange cycle.
Preferably, step (1) further comprises: when the first heat exchange unit, the condenser and the indirect cooling tower form a first heat exchange cycle, the first valve is closed, so that the second circulation pipe is closed.
Preferably, at least one group of flue gas treatment systems is arranged in the indirect cooling tower, and each flue gas treatment system comprises a desulfurization absorption tower, a flue gas temperature difference water lifting device, a dust removal device and a chimney, wherein the desulfurization absorption tower is used for removing sulfur oxides, the flue gas temperature difference water lifting device is used for recovering water, and the desulfurization absorption tower is sequentially communicated with the first air inlet and the first air outlet; the first air inlet is communicated with a boiler hearth; a flue gas denitration device for removing nitrogen oxides and a flue gas waste heat exchange device for recovering heat are arranged between the boiler furnace and the first air inlet; in the step (1) and the step (2), when the flue gas temperature difference water lifting device is started, flue gas discharged from a boiler furnace sequentially passes through the flue gas denitration device, the flue gas waste heat exchange device, the desulfurization absorption tower, the flue gas temperature difference water lifting device, the dust removal device and the chimney, and is discharged to the outside of the indirect cooling tower from the first air outlet.
Preferably, the flue gas temperature difference water lifting device comprises a flue gas channel and a medium channel which can exchange heat with each other, an inlet and an outlet of the flue gas channel are respectively communicated with the desulfurization absorption tower and the dust removal device, an inlet and an outlet of the medium channel are respectively communicated with a first three-way pipe and a second three-way pipe, one interface of the first three-way pipe is communicated with the inlet of the medium channel, and the other two interfaces of the first three-way pipe are respectively communicated with a water outlet end of the second circulating pipe and a water outlet end of the third circulating pipe; one connector of the second three-way pipe is communicated with the outlet of the medium channel, and the other two connectors of the second three-way pipe are respectively communicated with the water inlet end of the second circulating pipe and the water inlet end of the third circulating pipe; when the ambient temperature is higher than or equal to the preset temperature, the connection ports of the first tee pipe fitting and the second tee pipe fitting communicated with the second circulating pipe are closed, and the connection ports of the first tee pipe fitting and the second tee pipe fitting communicated with the third circulating pipe are opened; when the ambient temperature is lower than the preset temperature, the joints of the first three-way pipe and the second three-way pipe communicated with the second circulating pipe are opened, and the joints of the first three-way pipe and the second three-way pipe communicated with the third circulating pipe are closed.
Preferably, the first heat exchange device further comprises: the support frame further comprises the following steps before the step (1): and the support frame is distributed along the circumferential direction of the indirect cooling tower and extends along the height direction of the indirect cooling tower, and the first heat exchange unit and the second heat exchange unit are connected with the support frame through fixing pieces.
In addition, preferably, the air cooling system for a thermal power plant further includes: the sensor is used for monitoring environmental temperature data and transmitting the environmental temperature data to the control device; the first valve, the second valve and the third valve are all electrically connected with the control device; the control device receives the environmental temperature data, compares the environmental temperature data with a preset temperature, and performs corresponding action according to a comparison result; in step (1), the control device controls the first valve to be opened, the second valve to be opened and the third valve to be closed; in the step (2), the control device controls the first valve to be closed, the second valve to be closed, and the third valve to be opened.
As can be seen from the above description, the air cooling system and the control method for a thermal power plant provided by the present invention have the following advantages compared with the prior art: firstly, the running time of the mechanical draft indirect cooling tower is reduced, the service life of a fan is shortened, the annual noise pollution is reduced, the annual electricity consumption is reduced, and the energy consumption is reduced. Secondly, the heat dissipation capacity of the indirect cooling tower is redistributed by independently controlling the first heat exchange unit and the second heat exchange unit, so that the application range of the indirect cooling tower is expanded. Especially, when the mechanical ventilation indirect cooling tower needs to be overhauled and maintained, the indirect cooling tower provides heat dissipation for the flue gas temperature difference water lifting device, and the continuous operation of the flue gas temperature difference water lifting device is guaranteed.
Drawings
The above features and technical advantages of the present invention will become more apparent and readily appreciated from the following description of the embodiments thereof taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic view of an air cooling system for a thermal power plant employed in an embodiment of the present invention.
Fig. 2 is a schematic view illustrating a use state of the air cooling system for a thermal power plant shown in fig. 1.
Fig. 3 is a schematic view illustrating another use state of the air cooling system for a thermal power plant shown in fig. 1.
Fig. 4 is a schematic view illustrating still another use state of the air cooling system for a thermal power plant shown in fig. 1.
Wherein the reference numbers:
1: an indirect cooling tower; 2: a first heat exchange unit; 3: a second heat exchange unit;
4: a gas condenser; 5: a fan; 6: a mechanical draft indirect cooling tower;
7: a second heat exchange means; 8: a flue gas temperature difference water lifting device; 9: a first valve;
10: a second valve; 11: a third valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings. The terms "inner" and "outer" are used to refer to directions toward and away from, respectively, the geometric center of a particular component.
Fig. 1 is a schematic view of an air cooling system for a thermal power plant employed in an embodiment of the present invention. As shown in fig. 1, an air cooling system for a thermal power plant: the system comprises an indirect cooling tower 1, a condenser 4, a mechanical draft indirect cooling tower 6 and a flue gas temperature difference water lifting device 8.
The indirect cooling tower 1 is provided with a first air inlet and a first air outlet; generally, the first air inlet and the first air outlet are respectively arranged at the lower part and the upper part of the indirect cooling tower 1; a first heat exchange device opposite to the first air inlet is arranged outside the indirect cooling tower 1, and the first heat exchange device comprises a first heat exchange unit 2 and a second heat exchange unit 3 which are respectively and independently controlled;
the first heat exchange unit 2 is communicated with the gas condenser 4 through a first circulating pipe, the second heat exchange unit 3 is communicated with the gas condenser 4 through a second circulating pipe, and a water inlet end and a water outlet end of the second circulating pipe are respectively provided with a first valve 9;
the mechanical draft indirect cooling tower 6 is provided with a second air inlet and a second air outlet, and usually, the second air inlet and the second air outlet are respectively arranged at the lower part and the upper part of the mechanical draft indirect cooling tower 6; a fan 5 is arranged in the second air inlet or/and the second air outlet; a second heat exchange device 7 opposite to the second air inlet is arranged outside the mechanical ventilation indirect cooling tower 6;
the flue gas temperature difference water lifting device 8 is positioned in the indirect cooling tower 1, the flue gas temperature difference water lifting device 8 is communicated with the second heat exchange device 7 through a third circulating pipe, and a second valve 9 is arranged at the water inlet end and the water outlet end of the third circulating pipe; the flue gas temperature difference water lifting device 8 is communicated with the second heat exchange unit 3 through a fourth circulating pipe, and a third valve 11 is arranged at the water inlet end and the water outlet end of the fourth circulating pipe.
High-temperature steam after a steam turbine in the condenser 4 works exchanges heat with water (cold water) discharged from the first heat exchange device, the high-temperature steam loses heat and is condensed into water for recycling, the water discharged from the first heat exchange device obtains the heat and is converted into hot water, and the hot water enters the first heat exchange device again; the inlet water (hot water) of the first heat exchange device exchanges heat with the cold air of the indirect cooling tower 1, and the cold air obtains heat and is converted into hot air which is lifted and discharged out of the indirect cooling tower 1 at the inner side of the indirect cooling tower 1; the hot water of the first heat exchange device loses heat after heat exchange to form cold water, and is lifted into the gas condenser 4 again by the circulating pump to enter next circulation. The high-temperature flue gas exchanges heat with inlet water (cold water) provided by the flue gas temperature difference water lifting device 8, the high-temperature flue gas loses heat and is condensed into water for recycling, and because the inlet water of the flue gas temperature difference water lifting device 8 obtains heat, outlet water provided by the flue gas temperature difference water lifting device 8 is hot water and is lifted into the second heat exchange device 7 by the circulating pump; cold water in the second heat exchange device 7 exchanges heat with hot water provided by the flue gas temperature difference water lifting device 8, the hot water of the flue gas temperature difference water lifting device 8 loses heat to form cold water, and the cold water enters the flue gas temperature difference water lifting device 8 again to be circulated for the next time; cold water in the second heat exchange device 7 obtains heat to form hot water, and exchanges heat with cold air of the mechanical ventilation indirect cooling tower 6, and the cold air obtains heat and is converted into hot air to be lifted and discharged outside the mechanical ventilation indirect cooling tower 6 at the inner side of the mechanical ventilation indirect cooling tower 6; the hot water of the second heat exchange device loses heat after heat exchange to form cold water so as to circulate next time with the flue gas temperature difference water lifting device 8. When the heat exchanger is normally used, the first heat exchange device, the condenser 4 and the indirect cooling tower 1 form a heat exchange cycle; the second heat exchange device 7, the flue gas temperature difference water lifting device 8 and the mechanical ventilation indirect cooling tower 6 form heat exchange circulation; the two run independently and do not affect each other. When the external environment temperature is low, the indirect cooling tower 1 has extra heat exchange capacity after meeting the heat exchange requirement of the condenser 4, at the moment, the mechanical ventilation cooling tower 6 and the second heat exchange device 7 are closed, the heat exchange requirement of the condenser 4 is met through the first heat exchange unit 2, namely the first heat exchange unit 2, the condenser 3 and the indirect cooling tower 1 form a heat exchange cycle; satisfy the heat transfer needs of flue gas difference in temperature water lift device 8 through second heat exchange unit 3, flue gas difference in temperature water lift device 8 and indirect cooling tower 1 form the heat exchange circulation promptly. Adopt above-mentioned air cooling system for thermal power factory, mechanical air feed system and the parallelly connected use of nature air feed system, and through the operating duration of adjustment mechanical air feed system, reduce annual average noise pollution, reduce annual average power consumption, reduce the energy consumption.
Preferably, at least one group of flue gas treatment systems (not shown) is arranged in the indirect cooling tower 1, and each flue gas treatment system comprises a desulfurization absorption tower, a flue gas temperature difference water lifting device 8, a dust removal device and a chimney, which are sequentially communicated from a first air inlet to a first air outlet and are used for removing sulfur oxides; the first air inlet is communicated with a boiler furnace (not shown); a flue gas denitration device for removing nitrogen oxides and a flue gas waste heat exchange device for recovering heat are arranged between the boiler furnace (not shown) and the first air inlet. The flue gas sequentially passes through a flue gas denitration device, a flue gas waste heat exchange device, a first air inlet, a desulfurization absorption tower, a flue gas temperature difference water lifting device 8, a dust removal device, a chimney and a first air outlet from a boiler furnace, wherein the flue gas denitration device is used for treating nitrogen oxides in the flue gas; the flue gas waste heat exchange device can extract heat in the flue gas and recover the heat to heat the medium; the desulfurization absorption tower is used for treating sulfur oxides in the flue gas; the flue gas temperature difference water extraction device 8 extracts water in the flue gas, and the recovered water is recycled; the dust removal device is used for treating dust in the flue gas; the chimney is used for discharging flue gas, and the flue gas is lifted to a certain height by the indirect cooling tower 1 and then discharged to the environment; the indirect cooling tower 1 is matched with a flue gas treatment system, so that after flue gas pollutants in the flue gas discharged by the boiler are treated, the discharge indexes meet the requirements of relevant laws and regulations.
In the embodiment, two 660MW ultra-supercritical coal-fired air-cooling generator sets share one circulating water pump room, the main turbine and the small turbine exhaust steam are condensed by adopting surface type indirect air cooling towers, and the indirect air cooling towers are arranged near the circulating water pump room. The flue gas treatment systems are distributed in the indirect air cooling tower in a staggered way, and the emission concentration of the smoke dust treated by the dust removal device is not more than 1mg/Nm3Dust removal devices include, but are not limited to, electrostatic precipitators and wet electrostatic precipitators; the diameter of the chimney steel cylinder is 8m, and the top elevation of the chimney steel cylinder is 100 m; after being treated by the desulfurization absorption tower, the emission concentration of sulfur dioxide in the flue gas is not more than 10mg/Nm3After being treated by a flue gas denitration device (such as SCR), the nitrogen oxide (with NO)2Calculated) emission concentration of not more than 20mg/Nm3(ii) a The water in the flue gas is extracted by the flue gas temperature difference water lifting device 8 and recycled, the self-supply of a power plant production water source is realized, the synergistic removal effect of dust, NOx and SOx is realized while water is lifted, and the emission of a thermal power generating unit meets the environmental protection standard.
Preferably, the flue gas temperature difference water lifting device 8 comprises a flue gas channel and a medium channel which can exchange heat with each other, an inlet and an outlet of the flue gas channel are respectively communicated with the desulfurization absorption tower and the dust removal device, an inlet and an outlet of the medium channel are respectively communicated with a first three-way pipe and a second three-way pipe, one interface of the first three-way pipe is communicated with the inlet of the medium channel, and the other two interfaces of the first three-way pipe are respectively communicated with a water outlet end of the second circulating pipe and a water outlet end of the third circulating pipe; one connector of the second three-way pipe is communicated with the outlet of the medium channel, and the other two connectors of the second three-way pipe are respectively communicated with the water inlet end of the second circulating pipe and the water inlet end of the third circulating pipe. High-temperature flue gas that the desulfurization absorption tower provided gets into the flue gas passageway, and the cold water of 8 intake sides of flue gas difference in temperature water lift device gets into the medium passageway, and the flue gas passageway exchanges heat with the medium passageway, loses in the thermal flue gas passageway and discharges to intercooling tower 1, obtains thermal cold water hot water in the medium passageway and forms the hot water drainage to second heat transfer device 7. The first three-way pipe fitting and the second three-way pipe fitting are adopted to reduce the assembly difficulty among the circulating pipes, and the operation is convenient.
Preferably, the first heat exchange device further comprises: support frame (not shown), support frame along indirect cooling tower 1 circumference distribution and extend along indirect cooling tower 1's direction of height, first heat exchange unit 2 and second heat exchange unit 3 all are connected with support frame 1 through the mounting. The support frame is used for supporting the first heat exchange unit 2 and the second heat exchange unit 3 to be distributed along the circumferential direction of the indirect cooling tower 1 and extend along the height direction of the indirect cooling tower 1, and the first heat exchange unit 2 and the second heat exchange unit 3 are arranged in a stacked mode, so that the occupied space of the first heat exchange device is reduced, the increase of the radial width of the indirect cooling tower 1 is avoided, the height-diameter ratio of the indirect cooling tower cannot be influenced, and the economical efficiency of the manufacturing cost is guaranteed; adopt first heat exchange unit 2 and the overlapping setting of second heat exchange unit 3 to share the handling capacity simultaneously, avoid receiving the restriction of flow and velocity of flow, make the velocity of flow and the water side resistance of first heat exchange unit 2 and the inside of second heat exchange unit 3 both all keep in the within range that suits, improve 1 cost economic nature of intercooling tower, reduce first heat transfer device's running cost.
In this embodiment, the support frame provides a supporting and limiting function for the first heat exchange unit 2 and the second heat exchange unit 3 in different layers, and simultaneously the first heat exchange unit 2 and the second heat exchange unit 3 in the same layer can be distributed and fixed along the circumferential direction of the air cooling tower 1; the top of support frame is provided with the end cover, and the space between end cover sealable intercooling tower 1 and the support frame avoids rainwater or debris etc. to get into in the space.
The use of the air cooling system for a thermal power plant is described further below.
When the external environment temperature is high (normal use), the first heat exchange device, the condenser 4 and the indirect cooling tower 1 form a heat exchange cycle; the first heat exchange unit, the condenser and the indirect cooling tower form a first heat exchange cycle; the first valve 9 can be opened or closed according to actual needs, for example, the first valve 9 is opened, so that the second circulating pipe is communicated, and the second heat exchange unit 3, the condenser 4 and the intercooling tower 1 form a second heat exchange cycle; if the first valve is closed so that the second circulation pipe is in a closed state, only the first heat exchange cycle is started. The second heat exchange device 7, the flue gas temperature difference water lifting device 8 and the mechanical ventilation indirect cooling tower 6 form heat exchange circulation; wherein, the second valve 10 is opened to communicate the third circulating pipe, so that the second heat exchange device 7, the flue gas temperature difference water lifting device 8 and the mechanical draft indirect cooling tower 6 form a third heat exchange cycle; the third valve 11 is closed so that the fourth circulation pipe is in a closed state.
When the external environment temperature is low, the indirect cooling tower 1 has extra heat exchange capacity after meeting the heat exchange requirement of the condenser 4, at the moment, the mechanical ventilation cooling tower 6 and the second heat exchange device 7 are closed, the heat exchange requirement of the condenser 4 is met through the first heat exchange unit 2, namely, the first heat exchange unit 2, the condenser 3 and the indirect cooling tower 1 form a first heat exchange cycle; the heat exchange requirement of the flue gas temperature difference water lifting device 8 is met through the second heat exchange unit 3, namely the first valve 9 is closed, so that the second circulating pipe is in a closed state; closing the second valve 10 so that the third circulation passage is closed; and opening a third valve 11 to communicate the fourth circulating pipe, so that the second heat exchange unit 3, the flue gas temperature difference water lifting device 8 and the indirect cooling tower 1 form a fourth heat exchange cycle.
Fig. 2 is a schematic view illustrating a use state of the air cooling system for a thermal power plant shown in fig. 1. Fig. 3 is a schematic view illustrating another use state of the air cooling system for a thermal power plant shown in fig. 1. As shown in fig. 2 and 3, the air cooling system for a thermal power plant includes an indirect cooling tower 1, a condenser 4, a mechanical draft indirect cooling tower 6, and a flue gas temperature difference water lift 8.
The invention also provides a control method of the air cooling system for the thermal power plant, which comprises the following steps:
(1) when the ambient temperature is greater than or equal to the preset temperature, the first heat exchange unit 2, the condenser 4 and the indirect cooling tower 1 form a first heat exchange cycle; opening a first valve 9 to communicate the second circulation pipe so that the second heat exchange unit 3, the condenser 4 and the indirect cooling tower 1 form a second heat exchange cycle; opening a second valve 10 to communicate the third circulating pipe, so that the second heat exchange device 7, the flue gas temperature difference water lifting device 8 and the mechanical ventilation indirect cooling tower 6 form a third heat exchange cycle; closing the third valve 11 so that the fourth circulation pipe is in a closed state;
(2) when the ambient temperature is lower than the preset temperature, the first heat exchange unit 2, the condenser 4 and the indirect cooling tower 1 form a first heat exchange cycle; closing the first valve 9 so that the second circulation pipe is in a closed state; closing the second valve 10 so that the third circulation passage is closed; and opening a third valve 11 to communicate the fourth circulating pipe, so that the second heat exchange unit 3, the flue gas temperature difference water lifting device 8 and the indirect cooling tower 1 form a fourth heat exchange cycle.
High-temperature steam after a steam turbine in the condenser 4 works exchanges heat with water (cold water) discharged from the first heat exchange device, the high-temperature steam loses heat and is condensed into water for recycling, the water discharged from the first heat exchange device obtains the heat and is converted into hot water, and the hot water enters the first heat exchange device again; the inlet water (hot water) of the first heat exchange device exchanges heat with the cold air of the indirect cooling tower 1, and the cold air obtains heat and is converted into hot air which is lifted and discharged out of the indirect cooling tower 1 at the inner side of the indirect cooling tower 1; the hot water of the first heat exchange device loses heat after heat exchange to form cold water, and is lifted into the gas condenser 4 again by the circulating pump to enter next circulation. The high-temperature flue gas exchanges heat with inlet water (cold water) provided by the flue gas temperature difference water lifting device 8, the high-temperature flue gas loses heat and is condensed into water for recycling, and because the inlet water of the flue gas temperature difference water lifting device 8 obtains heat, outlet water provided by the flue gas temperature difference water lifting device 8 is hot water and is lifted into the second heat exchange device 7 by the circulating pump; cold water in the second heat exchange device 7 exchanges heat with hot water provided by the flue gas temperature difference water lifting device 8, the hot water of the flue gas temperature difference water lifting device 8 loses heat to form cold water, and the cold water enters the flue gas temperature difference water lifting device 8 again to be circulated for the next time; cold water in the second heat exchange device 7 obtains heat to form hot water, and exchanges heat with cold air of the mechanical ventilation indirect cooling tower 6, and the cold air obtains heat and is converted into hot air to be lifted and discharged outside the mechanical ventilation indirect cooling tower 6 at the inner side of the mechanical ventilation indirect cooling tower 6; the hot water of the second heat exchange device loses heat after heat exchange to form cold water so as to circulate next time with the flue gas temperature difference water lifting device 8. When the external environment temperature is low, the indirect cooling tower 1 has extra heat exchange capacity after meeting the heat exchange requirement of the condenser 4, at the moment, the mechanical ventilation cooling tower 6 and the second heat exchange device 7 are closed, the heat exchange requirement of the condenser 4 is met through the first heat exchange unit 2, namely, the first heat exchange unit 2, the condenser 3 and the indirect cooling tower 1 form a first heat exchange cycle; the heat exchange requirement of the flue gas temperature difference water lifting device 8 is met through the second heat exchange unit 3, namely the first valve 9 is closed, so that the second circulating pipe is in a closed state; closing the second valve 10 so that the third circulation passage is closed; and opening a third valve 11 to communicate the fourth circulating pipe, so that the second heat exchange unit 3, the flue gas temperature difference water lifting device 8 and the indirect cooling tower 1 form a fourth heat exchange cycle. When the external environment temperature is high (normal use), the first heat exchange device, the condenser 4 and the indirect cooling tower 1 form a heat exchange cycle; the first heat exchange unit, the condenser and the indirect cooling tower form a first heat exchange cycle; the first valve 9 can be opened or closed according to actual needs, for example, the first valve 9 is opened, so that the second circulating pipe is communicated, and the second heat exchange unit 3, the condenser 4 and the intercooling tower 1 form a second heat exchange cycle; if the first valve is closed so that the second circulation pipe is in a closed state, only the first heat exchange cycle is started. The second heat exchange device 7, the flue gas temperature difference water lifting device 8 and the mechanical ventilation indirect cooling tower 6 form heat exchange circulation; wherein, the second valve 10 is opened to communicate the third circulating pipe, so that the second heat exchange device 7, the flue gas temperature difference water lifting device 8 and the mechanical draft indirect cooling tower 6 form a third heat exchange cycle; the third valve 11 is closed so that the fourth circulation pipe is in a closed state. When the control method is adopted to operate the air cooling system for the thermal power plant, the mechanical air supply system and the natural air supply system are used in parallel, and the annual average noise pollution, the annual average power consumption and the energy consumption are reduced by adjusting the operation time of the mechanical air supply system.
Fig. 4 is a schematic view illustrating still another use state of the air cooling system for a thermal power plant shown in fig. 1. As shown in fig. 4, the first heat exchange unit 2 and the second heat exchange unit can be controlled to operate respectively.
Preferably, step (1) further comprises: when the first heat exchange unit 2, the condenser 4 and the indirect cooling tower 1 form the first heat exchange cycle, the first valve 9 is closed so that the second circulation pipe is closed. When the first heat exchange unit 2 can meet the use requirement of the condenser 4, the first valve 9 can be temporarily closed, so that the second heat exchange unit 3 is temporarily stopped to operate.
Preferably, at least one group of flue gas treatment systems is arranged in the indirect cooling tower, and each flue gas treatment system comprises a desulfurization absorption tower, a flue gas temperature difference water lifting device 8, a dust removal device and a chimney, wherein the desulfurization absorption tower is used for removing sulfur oxides, the flue gas temperature difference water lifting device is used for recovering water, and the desulfurization absorption tower is sequentially communicated with the first air inlet and the first air outlet; the first air inlet is communicated with a boiler hearth; a flue gas denitration device for removing nitrogen oxides and a flue gas waste heat exchange device for recovering heat are arranged between the boiler furnace and the first air inlet; in step (1) and step (2), when the flue gas temperature difference water lifting device starts, the flue gas discharged from the boiler furnace sequentially passes through the flue gas denitration device, the flue gas waste heat exchange device, the desulfurization absorption tower, the flue gas temperature difference water lifting device, the dust removal device and the chimney, and is discharged to the outside of the indirect cooling tower from the first air outlet. The flue gas sequentially passes through a flue gas denitration device, a flue gas waste heat exchange device, a first air inlet, a desulfurization absorption tower, a flue gas temperature difference water lifting device 8, a dust removal device, a chimney and a first air outlet from a boiler furnace, wherein the flue gas denitration device is used for treating nitrogen oxides in the flue gas; the flue gas waste heat exchange device can extract heat in the flue gas and recover the heat to heat the medium; the desulfurization absorption tower is used for treating sulfur oxides in the flue gas; the flue gas temperature difference water extraction device 8 extracts water in the flue gas, and the recovered water is recycled; the dust removal device is used for treating dust in the flue gas; the chimney is used for discharging flue gas, and the flue gas is lifted to a certain height by the indirect cooling tower 1 and then discharged to the environment; the indirect cooling tower 1 is matched with a flue gas treatment system, so that after flue gas pollutants in the flue gas discharged by the boiler are treated, the discharge indexes meet the requirements of relevant laws and regulations.
In the embodiment, two 660MW ultra-supercritical coal-fired air-cooling generator sets share one circulating water pump room, the main turbine and the small turbine exhaust steam are condensed by adopting surface type indirect air cooling towers, and the indirect air cooling towers are arranged near the circulating water pump room. The flue gas treatment systems are distributed in the indirect air cooling tower in a staggered way, and the emission concentration of the smoke dust treated by the dust removal device is not more than 1mg/Nm3Dust removal devices include, but are not limited to, electrostatic precipitators and wet electrostatic precipitators; the diameter of the chimney steel cylinder is 8m, and the top elevation of the chimney steel cylinder is 100 m; after being treated by the desulfurization absorption tower, the emission concentration of sulfur dioxide in the flue gas is not more than 10mg/Nm3After being treated by a flue gas denitration device (such as SCR), the nitrogen oxide (with NO)2Calculated) emission concentration of not more than 20mg/Nm3(ii) a The water in the flue gas is extracted by the flue gas temperature difference water lifting device 8 and recycled, the self-supply of a power plant production water source is realized, the synergistic removal effect of dust, NOx and SOx is realized while water is lifted, and the emission of a thermal power generating unit meets the environmental protection standard.
Preferably, the flue gas temperature difference water lifting device 8 comprises a flue gas channel and a medium channel which can exchange heat with each other, an inlet and an outlet of the flue gas channel are respectively communicated with the desulfurization absorption tower and the dust removal device, an inlet and an outlet of the medium channel are respectively communicated with a first three-way pipe and a second three-way pipe, one interface of the first three-way pipe is communicated with the inlet of the medium channel, and the other two interfaces of the first three-way pipe are respectively communicated with a water outlet end of the second circulating pipe and a water outlet end of the third circulating pipe; one connector of the second three-way pipe is communicated with the outlet of the medium channel, and the other two connectors of the second three-way pipe are respectively communicated with the water inlet end of the second circulating pipe and the water inlet end of the third circulating pipe; when the ambient temperature is higher than or equal to the preset temperature, the joints of the first three-way pipe fitting and the second three-way pipe fitting communicated with the second circulating pipe are closed, and the joints of the first three-way pipe fitting and the second three-way pipe fitting communicated with the third circulating pipe are opened; when the ambient temperature is lower than the preset temperature, the joints of the first three-way pipe and the second three-way pipe communicated with the second circulating pipe are opened, and the joints of the first three-way pipe and the second three-way pipe communicated with the third circulating pipe are closed. High-temperature flue gas that the desulfurization absorption tower provided gets into the flue gas passageway, and the cold water of 8 intake sides of flue gas difference in temperature water lift device gets into the medium passageway, and the flue gas passageway exchanges heat with the medium passageway, loses in the thermal flue gas passageway and discharges to intercooling tower 1, obtains thermal cold water hot water in the medium passageway and forms the hot water drainage to second heat transfer device 7. The first three-way pipe fitting and the second three-way pipe fitting are adopted to reduce the assembly difficulty among the circulating pipes, and the operation is convenient.
Preferably, the first heat exchange device further comprises: the support frame further comprises the following steps before the step (1): the support frame is distributed along the circumferential direction of the indirect cooling tower 1 and extends along the height direction of the indirect cooling tower 1, and the first heat exchange unit 2 and the second heat exchange unit 3 are connected with the support frame 1 through fixing pieces. The support frame is used for supporting the first heat exchange unit 2 and the second heat exchange unit 3 to be distributed along the circumferential direction of the indirect cooling tower 1 and extend along the height direction of the indirect cooling tower 1, and the first heat exchange unit 2 and the second heat exchange unit 3 are arranged in a stacked mode, so that the occupied space of the first heat exchange device is reduced, the increase of the radial width of the indirect cooling tower 1 is avoided, the height-diameter ratio of the indirect cooling tower cannot be influenced, and the economical efficiency of the manufacturing cost is guaranteed; adopt first heat exchange unit 2 and the overlapping setting of second heat exchange unit 3 to share the handling capacity simultaneously, avoid receiving the restriction of flow and velocity of flow, make the velocity of flow and the water side resistance of first heat exchange unit 2 and the inside of second heat exchange unit 3 both all keep in the within range that suits, improve 1 cost economic nature of intercooling tower, reduce first heat transfer device's running cost.
In this embodiment, the support frame provides a supporting and limiting function for the first heat exchange unit 2 and the second heat exchange unit 3 in different layers, and simultaneously the first heat exchange unit 2 and the second heat exchange unit 3 in the same layer can be distributed and fixed along the circumferential direction of the air cooling tower 1; the top of support frame is provided with the end cover, and the space between end cover sealable intercooling tower 1 and the support frame avoids rainwater or debris etc. to get into in the space.
In addition, preferably, the air cooling system for a thermal power plant further includes: the sensor is used for monitoring environmental temperature data and transmitting the environmental temperature data to the control device; the first valve 9, the second valve 10 and the third valve 11 are all electrically connected with a control device; the control device receives the environmental temperature data, compares the environmental temperature data with a preset temperature, and performs corresponding action according to a comparison result; in the step (1), the control device controls the first valve 9 to be opened, the second valve 10 to be opened and the third valve 11 to be closed; in step (2), the control device controls the first valve 9 to be closed, the second valve 10 to be closed, and the third valve 11 to be opened. Through setting up controlling means and sensor, can realize automatic operation, reduce work operation intensity.
As can be seen from the above description and practice, the air cooling system and the control method for a thermal power plant provided by the present invention have the following advantages compared with the prior art: firstly, the running time of the mechanical draft indirect cooling tower is reduced, the service life of a fan is shortened, the annual noise pollution is reduced, the annual electricity consumption is reduced, and the energy consumption is reduced. Secondly, the heat dissipation capacity of the indirect cooling tower is redistributed by independently controlling the first heat exchange unit and the second heat exchange unit, so that the application range of the indirect cooling tower is expanded. Especially, when the mechanical ventilation indirect cooling tower needs to be overhauled and maintained, the indirect cooling tower provides heat dissipation for the flue gas temperature difference water lifting device, and the continuous operation of the flue gas temperature difference water lifting device is guaranteed.
Those of ordinary skill in the art will understand that: the above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. An air cooling system for a thermal power plant, comprising:
the indirect cooling tower is provided with a first air inlet and a first air outlet; a first heat exchange device opposite to the first air inlet is arranged outside the indirect cooling tower and comprises a first heat exchange unit and a second heat exchange unit which are respectively and independently controlled;
the first heat exchange unit is communicated with the gas condenser through a first circulating pipe, the second heat exchange unit is communicated with the gas condenser through a second circulating pipe, and a water inlet end and a water outlet end of the second circulating pipe are respectively provided with a first valve;
the mechanical ventilation indirect cooling tower is provided with a second air inlet and a second air outlet, and a fan is arranged in the second air inlet or/and the second air outlet; a second heat exchange device opposite to the second air inlet is arranged outside the mechanical ventilation indirect cooling tower;
the flue gas temperature difference water lifting device is positioned in the indirect cooling tower and is communicated with the second heat exchange device through a third circulating pipe, and a water inlet end and a water outlet end of the third circulating pipe are both provided with second valves; the flue gas temperature difference water lifting device is communicated with the second heat exchange unit through a fourth circulating pipe, and a water inlet end and a water outlet end of the fourth circulating pipe are provided with third valves;
when the ambient temperature is greater than or equal to the preset temperature, the first heat exchange unit, the condenser and the indirect cooling tower form a first heat exchange cycle; opening a first valve to communicate a second circulation pipe so that a second heat exchange unit, the condenser and the indirect cooling tower form a second heat exchange cycle; opening a second valve to enable a third circulating pipe to be communicated, so that a third heat exchange circulation is formed by the second heat exchange device, the flue gas temperature difference water lifting device and the mechanical ventilation indirect cooling tower; closing the third valve to make the fourth circulating pipe in a closed state;
when the ambient temperature is lower than the preset temperature, the first heat exchange unit, the condenser and the indirect cooling tower form a first heat exchange cycle; closing the first valve so that the second circulation pipe is in a closed state; closing the second valve so that the third circulation pipe is closed; and opening the third valve to enable a fourth circulating pipe to be communicated, so that the second heat exchange unit, the flue gas temperature difference water lifting device and the indirect cooling tower form a fourth heat exchange cycle.
2. The air cooling system for a thermal power plant according to claim 1, wherein at least one group of flue gas treatment systems is disposed in the indirect cooling tower, and the flue gas treatment systems comprise a desulfurization absorption tower for removing sulfur oxides, the flue gas temperature difference water lifting device for recovering water, a dust removing device and a chimney, which are sequentially communicated from the first air inlet to the first air outlet; the first air inlet is communicated with a boiler hearth; and a flue gas denitration device for removing nitrogen oxides and a flue gas waste heat exchange device for recovering heat are arranged between the boiler furnace and the first air inlet.
3. The air cooling system for a thermal power plant according to claim 2, wherein the flue gas temperature difference water lifting device comprises a flue gas channel and a medium channel which can exchange heat with each other, an inlet and an outlet of the flue gas channel are respectively communicated with the desulfurization absorption tower and the dust removal device, an inlet and an outlet of the medium channel are respectively communicated with a first tee pipe and a second tee pipe, one connector of the first tee pipe is communicated with the inlet of the medium channel, and the other two connectors of the first tee pipe are respectively communicated with a water outlet end of the second circulating pipe and a water outlet end of the third circulating pipe; one connector of the second three-way pipe is communicated with the outlet of the medium channel, and the other two connectors of the second three-way pipe are respectively communicated with the water inlet end of the second circulating pipe and the water inlet end of the third circulating pipe.
4. The air cooling system for a thermal power plant according to any one of claims 1 to 3, wherein the first heat exchanging means further comprises: the support frame, the support frame is along the circumference distribution of indirect cooling tower just along the direction of height of indirect cooling tower extends, first heat exchange unit with second heat exchange unit all through the mounting with the support frame is connected.
5. A control method of an air cooling system for a thermal power plant according to claim 3, comprising:
(1) high-temperature steam after an inner steam turbine of the condenser does work exchanges heat with cold water of the first heat exchange device, the high-temperature steam loses heat and is condensed into water for recycling, the cold water of the first heat exchange device obtains the heat and is converted into hot water, and the hot water enters the first heat exchange device again;
(2) the hot water entering the first heat exchange device exchanges heat with cold air of the indirect cooling tower, and the cold air obtains heat and is converted into hot air which is lifted and discharged out of the indirect cooling tower at the inner side of the indirect cooling tower; the hot water of the first heat exchange device loses heat after heat exchange to form cold water, and is lifted into the gas condenser again by the circulating pump so as to enter the next circulation;
(3) the high-temperature flue gas exchanges heat with cold water provided by the flue gas temperature difference water lifting device, the high-temperature flue gas loses heat and is condensed into water for recycling, and the cold water of the flue gas temperature difference water lifting device obtains heat, and the outlet water provided by the flue gas temperature difference water lifting device is hot water and is lifted into a second heat exchange device by a circulating pump;
(4) cold water in the second heat exchange device exchanges heat with hot water provided by the smoke temperature difference water lifting device, the hot water of the smoke temperature difference water lifting device loses heat to form cold water, and the cold water enters the smoke temperature difference water lifting device again to be circulated for the next time;
(5) cold water in the second heat exchange device obtains heat to form hot water, the hot water exchanges heat with cold air of the mechanical ventilation inter-cooling tower, the cold air obtains heat and is converted into hot air, and the hot air is lifted and discharged outside the mechanical ventilation inter-cooling tower on the inner side of the mechanical ventilation inter-cooling tower; the hot water of the second heat exchange device loses heat after heat exchange to form cold water so as to be circulated with the smoke temperature difference water lifting device for the next time;
(6) when the external environment temperature is greater than or equal to the preset temperature, the first heat exchange device, the condenser and the indirect cooling tower form a heat exchange cycle; the second heat exchange device, the flue gas temperature difference water lifting device and the mechanical ventilation indirect cooling tower form a heat exchange cycle;
(7) when the external environment temperature is lower than the preset temperature, the indirect cooling tower has additional heat exchange capacity after meeting the heat exchange requirement of the condenser, and at the moment, the mechanical ventilation indirect cooling tower and the second heat exchange device are closed, and the heat exchange requirement of the condenser is met through the first heat exchange unit; through the second heat exchange unit, the heat exchange requirement of the flue gas temperature difference water lifting device is met.
6. The control method for the air cooling system of a thermal power plant according to claim 5, further comprising in step (6): when the first heat exchange unit, the condenser and the indirect cooling tower form a first heat exchange cycle, the first valve is closed, so that the second circulation pipe is closed.
7. The method for controlling the air cooling system of the thermal power plant according to claim 5 or 6, wherein in the step (6) and the step (7), when the flue gas temperature difference water pumping device is started, the flue gas discharged from the boiler furnace sequentially passes through a flue gas denitration device, a flue gas waste heat exchange device, a desulfurization absorption tower, a flue gas temperature difference water pumping device, a dust removal device and a chimney, and is discharged from the first air outlet to the outside of the indirect cooling tower.
8. The control method for the air cooling system of a thermal power plant according to claim 5 or 6, characterized in that when the ambient temperature is greater than or equal to a preset temperature, the ports of both the first tee pipe and the second tee pipe that communicate with the second circulation pipe are closed, and the ports of both the first tee pipe and the second tee pipe that communicate with the third circulation pipe are opened; when the ambient temperature is lower than the preset temperature, the joints of the first three-way pipe and the second three-way pipe communicated with the second circulating pipe are opened, and the joints of the first three-way pipe and the second three-way pipe communicated with the third circulating pipe are closed.
9. The control method of the air cooling system for a thermal power plant according to claim 5 or 6, wherein the first heat exchanging means further comprises: the support frame further comprises the following steps before the step (6): the support frame is provided with a first heat exchange unit and a second heat exchange unit in a stacked mode.
10. The control method of the air cooling system for a thermal power plant according to claim 5 or 6, wherein the air cooling system for a thermal power plant further includes: the sensor is used for monitoring environmental temperature data and transmitting the environmental temperature data to the control device; the first valve, the second valve and the third valve are all electrically connected with the control device; the control device receives the environmental temperature data, compares the environmental temperature data with a preset temperature, and performs corresponding action according to a comparison result; in step (6), the control device controls the first valve to be opened, the second valve to be opened, and the third valve to be closed; in step (7), the control device controls the first valve to be closed, the second valve to be closed, and the third valve to be opened.
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| CN102512929A (en) * | 2011-11-23 | 2012-06-27 | 西安交通大学 | System and method for recycling water vapor and heat in desulfurization tail smoke |
| CN102519299B (en) * | 2011-12-15 | 2013-05-01 | 东南大学 | System capable of improving cooling effect of cooling tower by means of reducing moisture content of air |
| CN207598302U (en) * | 2017-11-23 | 2018-07-10 | 刘春晓 | A kind of electricity-water co-generation system |
| CN108679637A (en) * | 2018-04-04 | 2018-10-19 | 北京兴晟科技有限公司 | A kind of energy saving white device that disappears of boiler smoke |
| CN208660405U (en) * | 2018-07-16 | 2019-03-29 | 东方电气集团东方锅炉股份有限公司 | A kind of coal-fired power station boiler flue gas white-smoke-removing system tower-coupled with cooling |
| CN109482035B (en) * | 2019-01-03 | 2024-02-09 | 国电环境保护研究院有限公司 | Multistage condensing system of desulfurization flue gas |
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