CN112648030A - Circulating water energy-saving utilization device of thermal power plant - Google Patents
Circulating water energy-saving utilization device of thermal power plant Download PDFInfo
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- CN112648030A CN112648030A CN202110011433.7A CN202110011433A CN112648030A CN 112648030 A CN112648030 A CN 112648030A CN 202110011433 A CN202110011433 A CN 202110011433A CN 112648030 A CN112648030 A CN 112648030A
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- circulating water
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- air
- cooling tower
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 188
- 238000001816 cooling Methods 0.000 claims abstract description 51
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 239000000498 cooling water Substances 0.000 claims description 33
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 239000000779 smoke Substances 0.000 abstract description 7
- 238000007664 blowing Methods 0.000 description 9
- 238000010248 power generation Methods 0.000 description 7
- 238000004134 energy conservation Methods 0.000 description 5
- 239000004071 soot Substances 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 239000008235 industrial water Substances 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 230000003203 everyday effect Effects 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K21/00—Steam engine plants not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
Abstract
The invention relates to a circulating water energy-saving utilization device of a thermal power plant, which comprises a water cooling tower, wherein a cooling circulating water outlet of a water collecting tank of the water cooling tower is respectively connected to a water inlet of a circulating water heater of an air supply system, a water inlet of a circulating water heater of a primary air system, a water inlet of a circulating water heating system of a plant area and the water cooling tower through pipelines, water outlets of the circulating water heater of the air supply system, the circulating water heater of the primary air system and the circulating water heating system of the plant area are all connected to a water-returning hydraulic generator, the water-returning hydraulic generator is connected to the water collecting tank of the water cooling tower, and air outlets of the. The circulating water energy-saving utilization device provided by the invention can heat primary air and supplied air all the year round, effectively reduces the low-temperature corrosion and blockage phenomena of the rotary air preheater of the boiler, reduces the front-back pressure difference of the rotary air preheater of the boiler, and improves the safe and stable operation performance of an air-smoke system of the boiler.
Description
Technical Field
The invention relates to the technical field of energy conservation of thermal power plants, in particular to a circulating water energy-saving utilization device of the thermal power plants.
Background
With the rapid development of power grids in China, the power generation modes of power grid power supply points in China also tend to be diversified, thermal power plants face greater environmental protection and energy conservation pressure, the current thermal power plants need to increase the investment in energy conservation and consumption reduction work and accelerate the work in the aspects of technical transformation and innovation, and the current thermal power plants have a lot of energy conservation and consumption reduction in the aspects of improving and optimizing systems, such as: energy-saving utilization needs to be enhanced in the aspects of air smoke systems, circulating cooling water and plant heating, so that the utilization levels of circulating water energy conservation and power plant water conservation are improved, and the following problems are specifically caused:
1. in order to prevent low-temperature corrosion of the rotary air preheater in autumn and winter every year in a boiler air-smoke system, an air heater of the air-smoke system needs to be used for heating air supply and primary air, so that the phenomenon of consumption of partial low-pressure steam is caused, and the steam consumption rate and the heat consumption rate of a thermal power plant are increased, and unnecessary economic cost is caused.
2. Because the cold ends of the rotary air preheaters of partial boilers are seriously blocked, partial low-pressure steam is consumed in partial thermal power plants in spring and summer due to the fact that the air heaters of the air and smoke system are put into the partial thermal power plants, and the steam consumption rate and the heat consumption rate of the thermal power plants are increased and unnecessary economic cost is caused.
3. Because the cold ends of the rotary air preheaters of part of boilers are seriously blocked, the air preheaters of all power plants prolong the soot blowing time and increase the frequency, so that the loss of a soot blowing steam source is caused, and the steam consumption rate and the heat consumption rate of the plants and the current of an induced draft fan are increased.
4. Taking a thermal power plant with a 2 x 300MW wet cooling mode as an example, circulating water needs 7.2-9.6 ten thousand tons of water replenishing of a circulating water system every year due to the evaporation and wind blowing loss of a cooling tower every day of about 6000-8000 tons, the water purchasing cost of 25.2-33.6 ten thousand yuan per year is calculated by taking the current price of the reclaimed water as 3.5 yuan/ton, and the water purchasing cost of 36-48 ten thousand yuan per year is calculated by taking the current price of industrial water as 5 yuan/ton (wherein water resource cost collected at some places is not included).
5. Taking a thermal power plant with 2 x 300MW air cooling mode as an example, the circulating cooling water of the auxiliary machine needs 1.2-2.4 ten thousand tons of circulating water system for water supplement all the year around due to the evaporation and wind blowing loss of a cooling tower of about 1000-2000 tons every day, the water purchasing cost of 4.2-8.4 ten thousand yuan per year is calculated by taking the current price of the reclaimed water as 3.5 yuan/ton, the water purchasing cost of 6-12 ten thousand yuan per year is calculated by taking the current price of the industrial water as 5 yuan/ton (the cost of water resources collected at some places is not included).
6. A large amount of manpower and material resources are invested to prevent the circulating cooling water cooling tower from freezing every year in winter.
7. The plant power rate of the wet-cold circulating cooling water system is about 0.8-1% every year, the annual power generation amount of a 2 x 300MW unit is about 30 hundred million KWh, the power consumption is about 240-300 million KWh, and the power consumption is about 96-120 ten thousand yuan compared with RMB.
The plant power rate of the circulating cooling water system of the air cooling auxiliary machine is about 0.3% every year, the annual power generation amount of a 2-300 MW unit is about 30 hundred million KWh, the power consumption is about 90 ten thousand KWh, and the power consumption is about 36 ten thousand yuan in terms of RMB.
Disclosure of Invention
In view of the above situation, the invention provides an energy-saving circulating water utilization device for a thermal power plant, which can heat primary air and supplied air all the year round, effectively reduce low-temperature corrosion and blockage of a rotary air preheater of a boiler, reduce the front-back pressure difference of the rotary air preheater of the boiler, and improve the safe and stable operation performance of an air-smoke system of the boiler.
The technical scheme of the invention is as follows: a circulating water energy-saving utilization device for a thermal power plant comprises a water cooling tower, a water-returning hydraulic generator, an air supply system circulating water heater, a primary air system circulating water heater and a plant circulating water heat supply system;
the circulating cooling water outlet of the water collecting tank of the water cooling tower is respectively connected to a water inlet of a circulating water heater of an air supply system, a water inlet of a circulating water heater of a primary air system, a water inlet of a circulating water heating system of a plant area and the water cooling tower through pipelines, water outlets of the circulating water heater of the air supply system, the circulating water heater of the primary air system and the circulating water heating system of the plant area are all connected to a water-returning hydraulic generator, the water-returning hydraulic generator is connected to the water collecting tank of the water cooling tower, an air inlet of the circulating water heater of the air supply system is connected with an air feeder, an air inlet of the circulating water heater of the primary air system is connected with a primary air fan, the air feeder is communicated.
Preferably, a circulating cooling water outlet pipeline of the water collecting tank of the water cooling tower is connected with a user pipeline to be cooled, and an outlet of the user pipeline to be cooled is respectively connected to a water inlet of a circulating water heater of the air supply system, a water inlet of a circulating water heater of the primary air system, a water inlet of a circulating water heating system of a plant area and the water cooling tower.
Preferably, control valves are arranged on the water inlet of the circulating water heater of the air supply system, the water inlet of the circulating water heater of the primary air system, the water inlet of the circulating water heating system of the plant area and the pipelines of the water cooling tower.
Preferably, the plant circulating water heat supply system comprises heat supply pipelines such as a boiler room, a plant factory building and an office area.
The circulating water energy-saving utilization device for the thermal power plant utilizes the circulating cooling water waste heat of the water cooling tower water collecting tank to heat the supplied air and the primary air temperature, can improve the supplied air temperature and the primary air temperature entering the cold end of the rotary air preheater of the boiler, thereby reducing the low-temperature corrosion and the blockage phenomenon of the cold end of the rotary air preheater of the boiler, reducing the soot blowing steam consumption of the cold end of the rotary air preheater of the boiler, reducing the circulating water temperature by the heat release of the returned circulating cooling water on the supplied air and the primary air, effectively cooling the circulating cooling water, recovering the residual pressure of the circulating cooling water for power generation, and thus saving about half of the plant power consumption rate of the circulating cooling water system.
The circulating water energy-saving utilization device for the thermal power plant has the following beneficial effects:
1. the air supply temperature and the primary air temperature are improved, the low-temperature corrosion and blockage phenomena of the rotary air preheater of the boiler are reduced, the soot blowing and steam consumption of the rotary air preheater of the boiler are reduced, and the steam consumption of the air heater of the boiler is reduced;
2. the circulating cooling water improves the utilization rate of cold source waste heat by releasing heat of the air supply and the primary air, reduces the power consumption of an auxiliary machine circulating pump or a circulating pump, and reduces the power consumption of a plant;
3. the condition of heating primary air and supplied air by annual investment can be achieved, the low-temperature corrosion and the blocking phenomenon of the rotary air preheater of the boiler are effectively reduced, the front and back pressure difference of the rotary air preheater of the boiler is effectively reduced, and the safe and stable operation performance of an air-smoke system of the boiler is improved.
4. A large amount of manpower and material resources are invested to freeze the water cooling tower every year in winter, about 1-5 ten thousand yuan of anti-freezing cost is saved every year, and the anti-freezing cost in the north is higher.
5. The vacuum of the unit and the efficiency of the unit are improved.
6. The heat and steam consumption of the plant area is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1-a water cooling tower; 2-a water-withdrawal hydro-generator; 3-circulating water heater of air supply system; 4-a primary air system circulating water heater; 5-a plant circulating water heat supply system; 6-a blower; 7-a primary air fan; 8-a circulating pump; 9-control valve.
Detailed Description
The technical scheme of the invention is further described in detail and completely by combining the following embodiments:
as shown in fig. 1, a circulating water energy-saving utilization device for a thermal power plant comprises a water cooling tower 1, a water-withdrawal hydraulic generator 2, an air supply system circulating water heater 3, a primary air system circulating water heater 4 and a plant circulating water heat supply system 5;
the circulating water cooling system is characterized in that a circulating pump 8 is arranged on a circulating water outlet pipeline of a collecting tank of the water cooling tower 1, a circulating cooling water outlet of the collecting tank of the water cooling tower 1 is respectively connected to a water inlet of a circulating water heater 3 of an air supply system, a water inlet of a circulating water heater 4 of a primary air system, a water inlet of a circulating water heating system 5 of a plant area and the water cooling tower 1 through pipelines, water outlets of the circulating water heater 3 of the air supply system, the circulating water heater 4 of the primary air system and the circulating water heating system 5 of the plant area are respectively connected to a water-returning hydraulic generator 2, the water-returning hydraulic generator 2 is connected to the collecting tank of the water cooling tower 1, an air inlet of the circulating water heater 3 of the air supply system is connected with an air feeder 6, an air inlet of the circulating water heater 4 of the primary air system is connected, The boiler primary air supply system is characterized in that control valves 9 are arranged on pipelines of a circulating water heating 3 water inlet of the air supply system, a circulating water heater 4 water inlet of the primary air system, a circulating water heating system 5 water inlet of a plant area and a water cooling tower 1.
Furthermore, a circulating cooling water outlet pipeline of a collecting tank of the water cooling tower is connected with a user pipeline to be cooled, and an outlet of the user pipeline to be cooled is respectively connected to a water inlet of a circulating water heater 3 of the air supply system, a water inlet of a circulating water heater 4 of the primary air system, a water inlet of a circulating water heat supply system 5 of the plant area and the water cooling tower 1, so that circulating cooling water is firstly radiated and then enters a rear cooling device to perform multiple utilization on waste heat.
Further, the plant circulating water heat supply system 5 comprises heat supply pipelines such as a boiler room, a plant factory building and an office area, and the residual heat of the circulating cooling water is fully utilized.
The circulating water energy-saving utilization device for the thermal power plant utilizes the circulating cooling water waste heat of the water cooling tower to heat the air supply and the primary air temperature, heats the air supply temperature and the primary air temperature to be more than 15 ℃ in a surface heat exchange mode, improves the air supply temperature and the primary air temperature at the cold end of the rotary air preheater of the boiler, reduces the low-temperature corrosion and blockage phenomenon at the cold end of the rotary air preheater of the boiler, reduces the soot blowing steam consumption at the cold end of the rotary air preheater of the boiler, releases heat to the air supply and the primary air by the circulating cooling water, reduces the water temperature, and recovers the circulating cooling water residual pressure for power generation due to the reduction of the water temperature of the circulating cooling water, thereby saving about half of the plant power consumption rate of the circulating cooling water system.
Through the implementation of the technical scheme, the circulating cooling water system of the air cooling auxiliary machine can achieve the cooling effect without a water spray packing layer of an auxiliary machine cooling water cooling tower, so that the consumption of the circulating cooling water of the air cooling auxiliary machine can be saved by more than 90%. Taking a thermal power plant with 2 x 300MW air cooling mode as an example, the circulating cooling water of the auxiliary machine needs 1.2-2.4 ten thousand tons of circulating water system for water supplement all the year around due to the evaporation and wind blowing loss of a cooling tower of about 1000-2000 tons every day, the water purchasing cost of 4.2-8.4 ten thousand yuan per year is calculated by using the current price of the reclaimed water at 3.5 yuan/ton, the water purchasing cost of 6-12 ten thousand yuan per year is calculated by using the current price of the industrial water at 5 yuan/ton, and the water resource cost collected in some places is not included. The plant power rate of the circulating cooling water system of the air cooling auxiliary machine is about 0.3% every year, the annual power generation amount of a 2-300 MW unit is about 30 hundred million KWh, the power consumption is about 90 ten thousand KWh, and the power consumption is about 36 ten thousand yuan in terms of RMB.
For the implementation of the wet and cold circulating cooling water system in northeast, northwest and northeast areas through the technical scheme, about 60 percent of circulating cooling water can achieve the cooling effect without passing through the water cooling tower water spray packing layer all the year round, so that the consumption of the circulating cooling water can be saved by more than 54 percent. Taking a thermal power plant with a 2 x 300MW wet cooling mode as an example, the circulating water needs 7.2-9.6 million tons of water replenishing of a circulating water system all the year round because of the evaporation and wind blowing loss of a cooling tower of about 6000-8000 tons each day. The water purchasing cost of 25.2-33.6-ten thousand yuan per year is calculated by using the current price of the reclaimed water at 3.5 yuan/ton, the water purchasing cost of 36-48-thousand yuan per year is calculated by using the current price of the industrial water at 5 yuan/ton, and the water resource cost collected in some places is not included. The plant power rate of the wet-cold circulating cooling water system is about 0.8-1% every year, the annual power generation amount of a 2 x 300MW unit is about 30 hundred million KWh, the power consumption is about 240-300 million KWh, and the power consumption is about 96-120 ten thousand yuan compared with RMB.
Claims (4)
1. A thermal power plant circulating water energy-saving utilization device is characterized by comprising a water cooling tower, a water-withdrawal hydraulic generator, an air supply system circulating water heater, a primary air system circulating water heater and a plant circulating water heat supply system;
the circulating cooling water outlet of the water collecting tank of the water cooling tower is respectively connected to a water inlet of a circulating water heater of an air supply system, a water inlet of a circulating water heater of a primary air system, a water inlet of a circulating water heating system of a plant area and the water cooling tower through pipelines, water outlets of the circulating water heater of the air supply system, the circulating water heater of the primary air system and the circulating water heating system of the plant area are all connected to a water-returning hydraulic generator, the water-returning hydraulic generator is connected to the water collecting tank of the water cooling tower, an air inlet of the circulating water heater of the air supply system is connected with an air feeder, an air inlet of the circulating water heater of the primary air system is connected with a primary air fan, the air feeder is communicated.
2. The circulating water energy-saving utilization device of the thermal power plant as claimed in claim 1, wherein a pipeline of a user to be cooled is connected to a circulating cooling water outlet of the water collecting pool of the water cooling tower, and outlets of the pipeline of the user to be cooled are respectively connected to a water inlet of a circulating water heater of an air supply system, a water inlet of a circulating water heater of a primary air system, a water inlet of a circulating water heating system of a plant area and the water cooling tower.
3. The circulating water energy-saving utilization device of the thermal power plant as claimed in claim 1, wherein control valves are arranged on the water inlet of the circulating water heater of the air supply system, the water inlet of the circulating water heater of the primary air system, the water inlet of the circulating water heating system of the plant area and the pipelines of the water cooling tower.
4. The circulating water energy-saving utilization device of the thermal power plant as claimed in claim 1, wherein the plant circulating water heat supply system comprises heat supply pipelines of a boiler room, a plant factory, an office area and the like.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110011433.7A CN112648030A (en) | 2021-01-06 | 2021-01-06 | Circulating water energy-saving utilization device of thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110011433.7A CN112648030A (en) | 2021-01-06 | 2021-01-06 | Circulating water energy-saving utilization device of thermal power plant |
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| CN209960455U (en) * | 2019-06-06 | 2020-01-17 | 济南美联同创能源科技有限公司 | Device for heating boiler air intake by using circulating water |
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2021
- 2021-01-06 CN CN202110011433.7A patent/CN112648030A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201763404U (en) * | 2010-09-13 | 2011-03-16 | 程长洪 | Vacuum water circulation differential pressure generating device |
| CN102094744A (en) * | 2010-12-05 | 2011-06-15 | 侯创新 | Condensate water and cooling water regenerating device of thermal power plant and nuclear power plant |
| CN102562183A (en) * | 2010-12-29 | 2012-07-11 | 中国电力工程顾问集团公司 | Indirect air cooling system and indirect air cooling method for supercritical machine set or ultra-supercritical machine set |
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Application publication date: 20210413 |