CN110735675A - compressed air preparation system based on total heat recovery of thermoelectric unit - Google Patents
compressed air preparation system based on total heat recovery of thermoelectric unit Download PDFInfo
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- CN110735675A CN110735675A CN201911119420.0A CN201911119420A CN110735675A CN 110735675 A CN110735675 A CN 110735675A CN 201911119420 A CN201911119420 A CN 201911119420A CN 110735675 A CN110735675 A CN 110735675A
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- steam
- air compressor
- steam turbine
- thermoelectric unit
- compressed air
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to an compressed air preparation system based on total heat recovery of a thermoelectric unit, which comprises a compressed air preparation system, a thermoelectric unit steam-water generation system and an air compressor driving system, wherein the thermoelectric unit steam-water generation system comprises a power generation steam turbine and a coaxially connected power generator, and the air compressor driving system comprises a gear box and an air compressor driving steam turbine.
Description
Technical Field
The invention relates to a thermoelectric generator set and compressed air preparation, in particular to compressed air preparation systems based on total heat recovery of the thermoelectric generator set.
Background
Air is a good medium for storing pressure energy due to good compressibility and stable pressure, and compressed air is easy to obtain and convenient to store and transport, so that the air is important power sources, and is widely applied to all industrial production industries including air separation, metallurgy, chemical industry, electric power, pharmacy, machinery and the like.
In recent years, the energy consumption for preparing the compressed air is reduced by degree by pushing of the high-efficiency screw air compressor, but the cost of energy, manpower, materials and the like still occupies fixed proportion because of the matching of devices for pretreatment, drying, post-treatment, storage and the like.
Industrial enterprises in China are mostly gathered into industrial parks according to the industry according to the planning, a matched thermoelectric unit is basically arranged in each park to provide heat steam for the park in a cogeneration mode, the thermoelectric unit is utilized to provide concentrated compressed air for the park to have trends, a steam turbine drags an air compressor to intensively supply compressed air, and the steam turbine has the advantages of high energy comprehensive utilization efficiency, reduced signature coal consumption and corresponding reduction of pollutants, is favorable for centralized treatment and adoption of advanced treatment technology, can effectively replace the existing small dispersed air compressors in the area by intensively supplying the compressed air, reduces the total energy consumption of the area and improves the area investment environment.
However, because the load of compressed air of industrial enterprises fluctuates, the adjustment range of a large-scale steam-operated air compressor is smaller, and an electric standby air compressor still needs to be configured under the condition of difficult adjustment, the flexibility of the system is poorer, most of electric energy in China is basically generated by a large-scale coal-fired unit through a turbine dragging generator, a condensing turbine operates according to the Rankine cycle principle, the Rankine cycle system consists of main equipment such as a water pump, a boiler, a turbine and a condenser, the latent heat of exhaust steam is taken away by circulating cooling water in the condenser, and more than half of energy is wasted in the form of cold end loss after being cooled by a cooling tower.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides compressed air preparation systems based on total heat recovery of thermoelectric units, wherein a steam turbine drives an air compressor, and the total heat recovery of waste heat is realized by the optimized design of the thermoelectric units, so that the loss of a cold end is reduced, and the flexibility of the compressed air preparation systems is improved.
The compressed air preparation system based on the total heat recovery of the thermoelectric unit comprises a compressed air preparation system, a thermoelectric unit steam-water system, a thermoelectric unit steam turbine power generation system and an air compressor driving system; the compressed air preparation system comprises an air filter, an air compressor and a drying and purifying device; the steam-water system of the thermoelectric unit comprises a water replenishing pump, a water replenishing heater, a deaerator, a water feeding pump, a high-pressure heater and a boiler; the thermoelectric unit steam turbine power generation system comprises a power generation steam turbine and a coaxially connected generator; the air compressor driving system comprises a gear box and an air compressor driving steam turbine; the inlet of the air compressor driving steam turbine is connected with the outlet of the power generation steam turbine, and the outlet of the air compressor driving steam turbine is connected with the water supplementing heater; two ends of the gear box are respectively connected with the air compressor and the air compressor driving steam turbine through bearings; the inlet of the power generation turbine is connected with the outlet of the boiler, the outlet of the power generation turbine is respectively connected with the air compressor driving turbine, the high-pressure heater and the deaerator, and the power generation turbine is also connected with the generator.
Preferably, the method comprises the following steps: the air filter, the air compressor and the drying and purifying device are connected in sequence.
Preferably, the method comprises the following steps: the outlet steam exhaust of the air compressor driving steam turbine is dead steam or low-pressure steam, and the air compressor driving steam turbine is connected with the low-pressure steam heat supply header.
Preferably, the method comprises the following steps: when the outlet steam exhaust of the air compressor driving steam turbine is dead steam, the air compressor driving steam turbine middle stage is provided with a steam extraction port and a pipeline and is connected with a low-pressure steam heat supply header; when the outlet exhaust steam of the air compressor driving steam turbine is low-pressure steam, the outlet of the air compressor driving steam turbine is connected with the low-pressure steam heat supply header.
Preferably, the method comprises the following steps: the outlet of the power generation turbine is provided with a medium-pressure steam heat supply header.
Preferably, the method comprises the following steps: the inlet of the water replenishing pump is connected with a water replenishing pipeline.
Preferably, the method comprises the following steps: the water replenishing pump, the water replenishing heater, the deaerator, the water feeding pump, the high-pressure heater and the boiler are connected in sequence.
The invention has the beneficial effects that: compared with a distributed compressed air preparation system, the compressed air preparation system based on total heat recovery of the thermoelectric unit provided by the invention adopts the steam turbine of the thermoelectric unit to drive the air compressor, and exhaust steam is totally recovered by the steam-water system of the thermoelectric unit or directly supplied with heat to the outside, so that the cold end loss of a condenser of a conventional unit is avoided, the overall energy efficiency is improved, the compressed air preparation system has higher flexibility compared with a compressed air system of a conventional back pressure machine, and an energy-saving scheme is provided for the compressed air preparation system.
Drawings
FIG. 1 is a schematic connection diagram of a compressed air preparation system based on total heat recovery of a thermoelectric power unit in example 1;
fig. 2 is a schematic connection diagram of a compressed air preparation system based on total heat recovery of a thermoelectric power unit in example 2.
Description of reference numerals: 1. an air filter; 2. an air compressor; 3. a drying and purifying device; 4. a gear case; 5. a power generation turbine; 6. a boiler; 7. a generator; 8. the air compressor drives the steam turbine; 9. a high pressure heater; 10. a feed pump; 11. a deaerator; 12. a water replenishing heater; 13. a water replenishing pump; 14. a low pressure steam heat supply header; 15. the medium pressure steam heat supply header.
Detailed Description
The present invention is further described in conjunction with the following examples which are set forth to aid in understanding the invention it is to be understood that various modifications and changes may be made by those skilled in the art without departing from the principles of the invention and these modifications and changes are intended to be within the scope of the appended claims.
For a thermoelectric unit, corresponding boiler water is needed to be supplemented after steam is conveyed outside, if exhaust steam of a steam turbine is used for preheating boiler water supplement, cold source loss is avoided, and total heat recovery of waste heat is achieved.
The compressed air preparation system based on the total heat recovery of the thermoelectric unit comprises a compressed air preparation system, a thermoelectric unit steam-water system, a thermoelectric unit steam turbine power generation system and an air compressor driving system; the compressed air preparation system comprises an air filter 1, an air compressor 2 and a drying and purifying device 3; the steam-water system of the thermoelectric unit comprises a water replenishing pump 13, a water replenishing heater 12, a deaerator 11, a water feeding pump 10, a high-pressure heater 9 and a boiler 6; the thermoelectric unit steam turbine power generation system comprises a power generation steam turbine 5 and a coaxially connected generator 7; the air compressor driving system comprises a gear box 4 and an air compressor driving steam turbine 8; the outlet of the air filter 1 is connected with the inlet of an air compressor 2, and the outlet of the air compressor 2 is connected with the inlet of a drying and purifying device 3; the steam inlet of the air compressor driving steam turbine 8 is connected with the outlet of the power generation steam turbine 5, the outlet of the air compressor driving steam turbine 8 is exhaust steam or low-pressure steam, and the outlet is connected with the water supplement heater 12 to heat water supplement, so that the full recovery of waste heat is realized, and meanwhile, the low-pressure heat load is met; the outlet of the air compressor driving turbine 8 is also connected with a low-pressure steam heat supply header 14; two ends of the gear box 4 are respectively connected with the air compressor 2 and the air compressor driving steam turbine 8 through bearings, so that the air compressor is driven by the steam turbine; an inlet of a power generation turbine 5 is connected with an outlet of a boiler 6, an outlet of the power generation turbine 5 is respectively connected with an air compressor driving turbine 8, a high-pressure heater 9 and a deaerator 11, an outlet of the power generation turbine 5 can also be provided with a medium-pressure steam heat supply header 15, and the power generation turbine 5 is also connected with a generator 7; the water replenishing pump 13, the water replenishing heater 12, the deaerator 11, the water feeding pump 10, the high-pressure heater 9 and the boiler 6 are connected in sequence.
The following description provides a detailed description of the present invention with reference to the drawings and examples, the invention uses the following features:
example 1
In the present embodiment, the structure of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the compressed air preparation system based on total heat recovery of the thermoelectric unit comprises a compressed air preparation system, a thermoelectric unit steam-water system, a thermoelectric unit steam turbine power generation system and an air compressor driving system; the compressed air preparation system comprises an air filter 1, an air compressor 2 and a drying and purifying device 3; the steam-water system of the thermoelectric unit comprises a water replenishing pump 13, a water replenishing heater 12, a deaerator 11, a water feeding pump 10, a high-pressure heater 9 and a boiler 6; the thermoelectric unit steam turbine power generation system comprises a power generation steam turbine 5 and a coaxially connected generator 7; the air compressor drive system includes a gear box 4 and an air compressor drive turbine 8.
The compressed air preparation system comprises the following components:
the air filter 1 is used for filtering particles, dust and tiny particles generated by mechanical operation in the outside air, and the air enters an inlet of the air compressor 2 after being filtered.
And air is compressed by the compressor unit 2 in multiple stages, the pressure of the air is increased to reach the value required by the subsequent process, and the compressed air enters the inlet of the drying and purifying device 3.
The drying and purifying device 3 removes substances such as moisture, carbon oxides and the like in the air according to the subsequent process requirements, and a cold dryer, a molecular sieve adsorption dryer and the like can be usually adopted.
As a preferred embodiment of the present invention, the compressed air preparation system in this embodiment is configured according to the conventional compressed air requirement, and can be optimized and adjusted according to the actual process step .
The steam-water system of the thermoelectric unit comprises the following components:
and the inlet of the water replenishing pump 13 is connected with a water replenishing pipeline and used for pressurizing and conveying the desalted water subjected to water treatment to a subordinate water replenishing heater.
And the water supplementing heater 12 is used for preheating water supplement of the boiler, heating steam is outlet exhaust steam of the air compressor driving steam turbine 8, hydrophobic steam and heated water supplement both enter the deaerator 11, and gasification latent heat is released by exhaust steam of the steam turbine in the water supplementing heater 12, so that the water supplementing temperature is improved, and the recovery of waste heat is realized.
And the deaerator 11 is used for deaerating boiler water supplement, steam drainage and the like, meets the requirement of boiler water consumption, and heats steam to be the outlet exhaust steam of the power generation steam turbine 5 (high back pressure steam turbine).
A feed water pump 10 for pressurizing boiler feed water.
And the high-pressure heater 9 is used for heating boiler feed water and fully utilizing the outlet exhaust steam of the power generation steam turbine 5.
And the boiler 6 heats boiler feed water to superheated steam by using coal, gas or other heat sources, and the superheated steam enters to step into the power generation turbine 5 to do work.
As a preferred embodiment of the present invention, the steam-water system of the thermoelectric power generating unit in this embodiment is configured according to the most basic devices of the thermoelectric power generating unit, and can be further optimized and adjusted according to the actual configuration of the thermoelectric power generating unit.
The steam turbine power generation system of the thermoelectric unit comprises the following components:
and the power generation pressure turbine 5 is used for converting the pressure energy of the high-pressure steam generated by the boiler 6 into kinetic energy to drive the turbine and drive the generator 7 to generate power.
And the generator 7 is coaxially connected with the power generation pressure turbine 5 and converts the kinetic energy of the turbine into electric energy.
In a preferred embodiment of the present invention, when the thermoelectric power unit is in need of medium pressure steam load, the outlet of the power generation turbine 5 may be provided with a medium pressure steam heating header 15 for supplying medium pressure steam.
As a preferred embodiment of the present invention, the power generation turbine 5 in the present embodiment may be configured to have a multi-stage, multi-cylinder, intermediate regenerative heat, or the like.
The air compressor machine actuating system includes as follows:
and the gear box 4 is used for connecting the air compressor 2 and the air compressor driving steam turbine 8 and converting the rotating speed of an output shaft of the steam turbine to the rotating speed matched with the air compressor.
The air compressor machine drives steam turbine 8, and the import links to each other with power generation steam turbine 5, and the exhaust steam pressure energy conversion of higher level's steam turbine is kinetic energy to drive air compressor machine 2 through gear box 4, the steam outlet exhaust steam of air compressor machine drive steam turbine 8 is low vacuum exhaust steam for heating boiler moisturizing, sets up extraction opening and pipeline at air compressor machine drive steam turbine 8 intermediate stage, is connected with low pressure steam heat supply header 14, provides low pressure steam for peripheral heat consumer.
Example 2
In the present embodiment, the structure of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 2, the compressed air production system based on total heat recovery of the thermoelectric power unit can be optimized and selected for the air compressor drive turbine 8 when the peripheral heat load demand of the thermoelectric power unit is large, and the following description will be made for a part different from example 1.
The air compressor drives the steam turbine 8, the import links to each other with the power generation steam turbine 5, converts the exhaust steam pressure energy of higher level's steam turbine into kinetic energy to drive the air compressor machine 2 through the gear box 4, the steam outlet exhaust steam of air compressor drive steam turbine 8 is low pressure steam, and pressure satisfies peripheral heat user demand, and low pressure steam is as the heat source of moisturizing heater 12 simultaneously, and the exhaust steam export of air compressor drive steam turbine 8 links to each other with moisturizing heater 12 and low pressure steam heat supply header 14.
Claims (7)
- The compressed air preparation system based on total heat recovery of the thermoelectric unit is characterized by comprising a compressed air preparation system, a thermoelectric unit steam-water generating system and an air compressor driving system, wherein the compressed air preparation system comprises an air filter (1), an air compressor (2) and a drying and purifying device (3), the thermoelectric unit steam-water system comprises a water supplementing pump (13), a water supplementing heater (12), a deaerator (11), a water feeding pump (10), a high-pressure heater (9) and a boiler (6), the thermoelectric unit steam-turbine generating system comprises a power generation steam turbine (5) and a coaxially connected generator (7), the air compressor driving system comprises a gear box (4) and an air compressor driving steam turbine (8), an inlet of the air compressor driving steam turbine (8) is connected with an outlet of the power generation steam turbine (5), an outlet of the air compressor driving steam turbine (8) is connected with the water supplementing heater (12), two ends of the gear box (4) are respectively connected with the air compressor (2) and the air compressor driving steam turbine (8) through bearings, an inlet of the power generation steam turbine (5) is connected with an outlet of the boiler (6), an outlet of the power generation steam turbine (5) is.
- 2. The compressed air preparation system based on thermoelectric unit total heat recovery of claim 1, wherein: the air filter (1), the air compressor (2) and the drying and purifying device (3) are connected in sequence.
- 3. The compressed air preparation system based on thermoelectric unit total heat recovery of claim 1, wherein: the outlet steam of the air compressor driving steam turbine (8) is dead steam or low-pressure steam, and the air compressor driving steam turbine (8) is connected with a low-pressure steam heat supply header (14).
- 4. The compressed air preparation system based on thermoelectric unit total heat recovery of claim 3, wherein: when the outlet steam exhaust of the air compressor driving steam turbine (8) is dead steam, a steam extraction port and a pipeline are arranged at the middle stage of the air compressor driving steam turbine (8) and are connected with a low-pressure steam heat supply header (14); when the outlet exhaust steam of the air compressor driving steam turbine (8) is low-pressure steam, the outlet of the air compressor driving steam turbine (8) is connected with the low-pressure steam heat supply header (14).
- 5. The compressed air preparation system based on thermoelectric unit total heat recovery of claim 1, wherein: the outlet of the power generation turbine (5) is provided with a medium pressure steam heat supply header (15).
- 6. The compressed air preparation system based on thermoelectric unit total heat recovery of claim 1, wherein: the inlet of the water replenishing pump (13) is connected with a water replenishing pipeline.
- 7. The compressed air preparation system based on thermoelectric unit total heat recovery of claim 1, wherein: the water replenishing pump (13), the water replenishing heater (12), the deaerator (11), the water feeding pump (10), the high-pressure heater (9) and the boiler (6) are connected in sequence.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112012802A (en) * | 2020-08-07 | 2020-12-01 | 浙江华川实业集团有限公司 | Cold, hot, gas and electricity four-combined supply process for power generation of steam turbine in factory |
CN113864002A (en) * | 2021-10-18 | 2021-12-31 | 西安西热节能技术有限公司 | Steam and electricity double-drive compressed air preparation system based on cogeneration unit |
-
2019
- 2019-11-15 CN CN201911119420.0A patent/CN110735675A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112012802A (en) * | 2020-08-07 | 2020-12-01 | 浙江华川实业集团有限公司 | Cold, hot, gas and electricity four-combined supply process for power generation of steam turbine in factory |
CN113864002A (en) * | 2021-10-18 | 2021-12-31 | 西安西热节能技术有限公司 | Steam and electricity double-drive compressed air preparation system based on cogeneration unit |
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