CN115681936A - 650 ℃ ultra-supercritical horizontal supercharged boiler and circulating system - Google Patents
650 ℃ ultra-supercritical horizontal supercharged boiler and circulating system Download PDFInfo
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003546 flue gas Substances 0.000 claims abstract description 30
- 238000002485 combustion reaction Methods 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 239000000446 fuel Substances 0.000 claims description 21
- 239000007789 gas Substances 0.000 claims description 13
- 230000005855 radiation Effects 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 6
- 239000003245 coal Substances 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 238000011160 research Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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Abstract
A 650 ℃ ultra-supercritical horizontal supercharged boiler and a circulating system. The problems of pulverized coal ignition, poor stable combustion characteristic, low boiler thermal efficiency, weak steam temperature reaching capability and the like exist in a hearth when a boiler in the prior art is operated. The invention comprises the following components: the 650 ℃ ultra-supercritical horizontal supercharged boiler is characterized by comprising a 650 ℃ ultra-supercritical horizontal supercharged boiler (1) which is of a horizontal arrangement structure, a pressure-bearing shell sealing structure is arranged on the periphery of a boiler body, a convection heating surface of a horizontal flue is vertically arranged along the flow direction of flue gas, burners are arranged on two side walls, air in a burner area is respectively connected with an air compressor (2) and a starting fan (3) through pipelines, the air compressor is connected with a turbine (4) through a pipeline, one end of the turbine is connected with a tail flue of the boiler through a pipeline, the other end of the turbine is connected with a pipeline fan (5), and the fan is connected with a chimney (6) through a pipeline. The invention is used for 650 ℃ ultra-supercritical horizontal supercharged boilers and circulating systems.
Description
The technical field is as follows:
the invention relates to the technical field of high-efficiency ultra-supercritical pulverized coal boilers of large power stations, in particular to a 650 ℃ ultra-supercritical horizontal supercharged boiler and a circulating system.
Background art:
along with the national proposal of constructing a clean, low-carbon, safe and efficient energy system, coal-fired power generation enterprises face the challenges of resources, environment and double-carbon targets, the efficient combustion of the pulverized coal boiler is emphasized and developed, and the development and large-scale adoption of a new generation of higher-parameter ultra-supercritical power generation technology is bound to be a main development direction of thermal power plants in China in the future, and has important significance for saving energy and reducing pollution;
in the power generation technology of the 650 ℃ ultra-supercritical boiler in the prior art, the problems of pulverized coal ignition, poor stable combustion characteristic, low boiler thermal efficiency, weak steam temperature reaching capability and the like exist in a hearth when the boiler operates, and the defects of excessively high cost and long investment recovery period of the conventional 650 ℃ ultra-supercritical boiler due to the problems of overhigh boiler structure height, large floor area, large consumption of steel frameworks, large high-grade materials, high consumption of small-caliber pipelines, complex arrangement of pipeline systems and the like exist at the same time;
at present, domestic and foreign research institutions respectively carry out research work on a horizontal boiler system and a ship supercharged boiler system, and published research results show that compared with a conventional pi-shaped boiler and a tower boiler, the horizontal boiler system can obviously reduce the height of the boiler, reduce steel materials of a boiler frame structure, save connecting pipelines of the boiler and a steam turbine and greatly save engineering investment; the supercharged boiler system can enhance the combustion efficiency of the boiler, strengthen heat transfer in a hearth and reduce the boiler volume and the steel consumption of a heating surface in the hearth, but the research and the application of the two technologies on a 650-DEG C high-parameter-level boiler system are almost not available.
The invention content is as follows:
the invention aims to provide a 650 ℃ ultra-supercritical horizontal supercharged boiler and a circulating system, wherein a boiler body in the circulating system adopts a novel horizontal arrangement structure, the periphery of the boiler body is sealed by a pressure-bearing boiler shell, the boiler body is provided with a turbocharging system, and a boiler supercharging device directly drives a gas compressor to work by utilizing a flue gas turbine driven by boiler exhaust smoke, so that the fuel combustion and heat transfer strength in the boiler shell is improved, and the heat efficiency and the steam temperature reaching capability of the boiler are improved.
The above purpose is realized by the following technical scheme:
a650 ℃ ultra-supercritical horizontal supercharged boiler and circulating system comprises: the 650 ℃ ultra-supercritical horizontal supercharged boiler is of a horizontal arrangement structure, a pressure-bearing shell sealing structure is adopted on the periphery of a boiler body, a convection heating surface of a horizontal flue is vertically arranged along the flow direction of flue gas, burners are arranged on two side walls, air in a burner area is respectively connected with an air compressor and a starting fan through pipelines, the air compressor is connected with a turbine through a pipeline, one end of the turbine is connected with a tail flue of the boiler through a pipeline, the other end of the turbine is connected with the pipeline fan, and the fan is connected with a chimney through a pipeline;
when the system is just started, the air is boosted by the starting fan and is conveyed to a hearth so that a combustor works and burns under low load, the generated flue gas enters the turbine to push the turbine to compress air, and the starting fan is closed after the turbine and the air compressor system work stably;
when the horizontal supercharged boiler and the circulating system operate, part of flue gas is extracted from the tail flue, the extracted flue gas is used for pushing the turbine, the turbine drives the compressor to compress air, the compressed air is conveyed to the boiler shell along the air channel and enters the hearth through the guide device between the boiler shells to be mixed with fuel, so that the fuel in the hearth is fully mixed with the air under high pressure, the combustion strength and the volumetric heat load of the fuel in the hearth are improved, the flow speed of the flue gas is improved, the radiation and convection heat transfer in the hearth are enhanced, the high-quality combustion of the fuel in the hearth is ensured, and the steam parameter of the boiler reaches 650 ℃;
the periphery of a boiler body is sealed by a pressure-bearing boiler shell, a convection heating surface is arranged in a horizontal flue along the flow direction of flue gas, a turbo-charging system is arranged, a boiler supercharging device drives a flue gas turbine to directly drive a gas compressor to work by utilizing boiler exhaust gas, air entering the gas compressor is compressed to a certain pressure and enters the boiler shell along an air channel, and fuel in a hearth is mixed and combusted with the air under higher pressure.
Has the advantages that:
1. the invention relates to a 650 ℃ ultra-supercritical horizontal supercharged boiler and a circulating system thereof, wherein the boiler circulating system is provided with a sealed pressure-bearing boiler shell around a boiler body by changing the conventional arrangement structure of the 650 ℃ ultra-supercritical boiler on the basis of adopting a novel horizontal arrangement structure, and is additionally provided with a turbine and a compressor system, so that the height of the boiler is reduced, and simultaneously, the turbine is pushed to drive the compressor to compress air to be supplied to a hearth by utilizing the residual energy of tail flue gas, the combustion-supporting air pressure in the hearth is greatly improved, fuel and air in the hearth are fully mixed, the problem of flue gas leakage caused by poor sealing of the hearth in a high-pressure combustion state is avoided, the combustion efficiency and the steam temperature reaching capability of the boiler are improved, and the engineering cost is greatly reduced.
2. The circulating system of the invention can reduce the height of the boiler, reduce the volume of the boiler, reduce the consumption of steel materials of the boiler and the consumption of connecting pipelines with a steam turbine, save the manufacturing cost and the occupied space of the boiler, avoid the leakage of flue gas of a hearth, fully utilize the energy of the tail flue gas, and effectively improve the thermal efficiency and the steam temperature reaching capability of the boiler.
3. The circulating system provided by the invention has the advantages that the conventional arrangement structure of the 650 ℃ ultra supercritical boiler is changed, the novel horizontal structure arrangement is adopted, the height of the boiler can be reduced, the volume of the boiler is reduced, the outlet elevation of a main steam pipeline of the boiler can be reduced to the platform elevation of a steam turbine, the consumption of steel materials of a boiler frame structure and a connecting pipeline of the boiler and the steam turbine can be obviously reduced, and the manufacturing cost and the occupied space of the boiler are saved; meanwhile, the pressure-bearing boiler shell sealing structure is designed around the boiler body, so that the problem that flue gas of the hearth leaks outwards in a pressure combustion state can be avoided.
4. The circulating system is additionally provided with the turbine and the compressor system, the residual energy of tail flue gas is utilized, the auxiliary power is saved, the turbine is pushed to drive the compressor to compress air and send the air into the hearth, the fuel in the hearth is fully mixed with the air under high pressure, the combustion intensity and the volume heat load of the fuel in the hearth are greatly improved, the flow speed of the flue gas is improved, the radiation and convection heat transfer in the hearth are enhanced, the combustion efficiency and the heat efficiency of the boiler are improved, the capacity of the boiler reaching the steam temperature of 650 ℃ is improved, the starting speed of the boiler can be accelerated, and the consumption of steel on a heating surface is saved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein: 1. the method comprises the following steps of (1) a 650 ℃ ultra supercritical horizontal supercharged boiler, 2, a compressor, 3, a starting fan, 4, a turbine, 5, a fan, 6 and a chimney.
The specific implementation mode is as follows:
example 1:
a650 ℃ ultra-supercritical horizontal supercharged boiler and circulating system comprises: the 650 ℃ ultra-supercritical horizontal supercharged boiler adopts a horizontal arrangement structure, a pressure-bearing shell sealing structure is adopted at the periphery of a boiler body, a convection heating surface of a horizontal flue is vertically arranged along the flow direction of flue gas, burners are arranged on two side walls, air in a burner area is respectively connected with an air compressor 2 and a starting fan 3 through pipelines, the air compressor is connected with a turbine 4 through a pipeline, one end of the turbine is connected with a tail flue of the boiler through a pipeline, the other end of the turbine is connected with a pipeline fan 5, and the fan is connected with a chimney 6 through a pipeline;
when the system is just started, the air is boosted by the starting fan and is conveyed to a hearth so that a combustor works and burns under low load, the generated flue gas enters the turbine to push the turbine to compress air, and the starting fan is closed after the turbine and the air compressor system work stably;
when the horizontal supercharged boiler and the circulating system operate, part of flue gas is extracted from the tail flue, the extracted flue gas is used for pushing the turbine, the turbine drives the compressor to compress air, the compressed air is conveyed to the boiler shell along the air channel and enters the hearth through the guide device between the boiler shells to be mixed with fuel, so that the fuel in the hearth is fully mixed with the air under high pressure, the combustion strength and the volumetric heat load of the fuel in the hearth are improved, the flow speed of the flue gas is improved, the radiation and convection heat transfer in the hearth are enhanced, the high-quality combustion of the fuel in the hearth is ensured, and the steam parameter of the boiler reaches 650 ℃;
the periphery of a boiler body is sealed by a pressure-bearing boiler shell, a convection heating surface is arranged in a horizontal flue along the flow direction of flue gas, a turbo-charging system is arranged, a boiler supercharging device drives a flue gas turbine to directly drive a gas compressor to work by utilizing boiler exhaust gas, air entering the gas compressor is compressed to a certain pressure and enters the boiler shell along an air channel, and fuel in a hearth is mixed and combusted with the air under higher pressure.
The 650 ℃ ultra-supercritical horizontal supercharged boiler and the circulating system are invented by combining the structural characteristics and technical advantages of the horizontal boiler system and the ship supercharged boiler system, so that the performance of the 650 ℃ high-parameter ultra-supercritical boiler system is improved, and the engineering cost is greatly reduced;
compared with a conventional 650 ℃ conventional pi-shaped furnace and a conventional tower-type furnace, the horizontal-type furnace and the horizontal-type furnace are arranged, the design reduces the height of the boiler, the elevation of the outlet of a main steam pipeline of the boiler can be reduced to the elevation of a platform of a steam turbine, the consumption of steel materials of a framework structure of the boiler and a connecting pipeline of the steel materials and the steam turbine can be obviously reduced, a pressure-bearing sealed boiler shell is wrapped around the boiler, a turbine and a gas compressor are additionally arranged in a circulating system, the fuel in a hearth is ensured to be fully mixed and combusted with air under the high-pressure environment, the heat load of the volume of the hearth is greatly improved due to the enhancement of combustion, the radiation and convection heat exchange is strengthened, the steam parameter of the boiler is ensured to reach 650 ℃, the thermal efficiency of the boiler is improved, the engineering cost is greatly reduced, and the horizontal-type furnace is suitable for various grades of high-parameter coal-fired boiler systems;
compared with a conventional boiler circulating system, the ultra-supercritical high-parameter thermal power generating unit with the temperature of 650 ℃ can save steel and reduce the construction cost, meanwhile, the hearth pressurization environment can ensure high-quality combustion of fuel, the heat exchange effect of radiation and convection heating surfaces in the hearth is enhanced, energy is saved, consumption is reduced, and the thermal efficiency and the steam temperature reaching capability of the boiler are improved.
Claims (1)
1. A650 ℃ ultra-supercritical horizontal supercharged boiler and circulating system comprises: the 650 ℃ ultra-supercritical horizontal supercharged boiler is characterized in that: the 650 ℃ ultra-supercritical horizontal supercharged boiler adopts a horizontal arrangement structure, a pressure-bearing boiler shell sealing structure is adopted around a boiler body, a convection heating surface of a horizontal flue is vertically arranged along the flow direction of flue gas, a burner is arranged on two side walls, air in a burner area is respectively connected with a gas compressor and a starting fan through pipelines, the gas compressor is connected with a turbine through a pipeline, one end of the turbine is connected with a tail flue of the boiler through a pipeline, the other end of the turbine is connected with the pipeline fan, and the fan is connected with a chimney through a pipeline;
when the system is just started, the air is boosted by the starting fan and is conveyed to a hearth so that a combustor works and burns under low load, the generated flue gas enters the turbine to push the turbine to compress air, and the starting fan is closed after the turbine and the air compressor system work stably;
when the horizontal supercharged boiler and the circulating system operate, part of flue gas is extracted from the tail flue, the extracted flue gas is used for pushing the turbine, the turbine drives the compressor to compress air, the compressed air is conveyed to the boiler shell along the air channel and enters the hearth through the guide device between the boiler shells to be mixed with fuel, so that the fuel in the hearth is fully mixed with the air under high pressure, the combustion strength and the volumetric heat load of the fuel in the hearth are improved, the flow speed of the flue gas is improved, the radiation and convection heat transfer in the hearth are enhanced, the high-quality combustion of the fuel in the hearth is ensured, and the steam parameter of the boiler reaches 650 ℃;
the periphery of a boiler body is sealed by a pressure-bearing boiler shell, a convection heating surface is arranged in a horizontal flue along the flow direction of flue gas, a turbo-charging system is arranged, a boiler supercharging device drives a flue gas turbine to directly drive a gas compressor to work by utilizing boiler exhaust gas, air entering the gas compressor is compressed to a certain pressure and enters the boiler shell along an air channel, and fuel in a hearth is mixed and combusted with the air under higher pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211379105.3A CN115681936A (en) | 2022-11-04 | 2022-11-04 | 650 ℃ ultra-supercritical horizontal supercharged boiler and circulating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211379105.3A CN115681936A (en) | 2022-11-04 | 2022-11-04 | 650 ℃ ultra-supercritical horizontal supercharged boiler and circulating system |
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| Publication Number | Publication Date |
|---|---|
| CN115681936A true CN115681936A (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211379105.3A Pending CN115681936A (en) | 2022-11-04 | 2022-11-04 | 650 ℃ ultra-supercritical horizontal supercharged boiler and circulating system |
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| Country | Link |
|---|---|
| CN (1) | CN115681936A (en) |
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- 2022-11-04 CN CN202211379105.3A patent/CN115681936A/en active Pending
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