CN108954374B - After-combustion air system of combined cycle waste heat boiler - Google Patents
After-combustion air system of combined cycle waste heat boiler Download PDFInfo
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- CN108954374B CN108954374B CN201810933703.8A CN201810933703A CN108954374B CN 108954374 B CN108954374 B CN 108954374B CN 201810933703 A CN201810933703 A CN 201810933703A CN 108954374 B CN108954374 B CN 108954374B
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- pipeline
- air supply
- valve
- afterburner
- air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Of Fluid Fuel (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
And the after-combustion air system of the combined cycle waste heat boiler. The addition of the afterburner at the inlet of the waste heat boiler is an effective means for improving the heat exchange efficiency of the waste heat boiler and increasing the power generation load of the power station. However, some gas and oil fuels cannot be fully combusted by the afterburner due to the limitation of the exhaust gas oxygen concentration of the gas turbine. The composition of the invention comprises: the afterburner comprises an afterburner body (1), wherein the afterburner body is connected with a control cabinet, a group of fuel inlet interfaces, a group of air supply interfaces and a compressed air interface are arranged on the afterburner body, the fuel inlet interfaces are connected with a main gas fuel pipeline (2), the main gas fuel pipeline is connected with a group of compressed air pipelines (3) and an auxiliary gas pipeline (4), the compressed air pipeline is connected with an air compressor (5), the air supply interfaces are connected with an air supply pipeline (6), and the air supply pipeline is connected with an air blower (7). The invention relates to a novel air supply system for an afterburner of a combined cycle waste heat boiler.
Description
Technical Field
The invention relates to a post-combustion air system of a combined cycle waste heat boiler.
Background
In recent years, the power industry is continuously developing at a high speed, and the gas-steam combined cycle power generation technology has a complete technical system from the beginning of the 20 th century, so that the technology is a mature power generation technology with reliable technology, stable operation and huge user population. The market demand of the domestic and foreign combined cycle power generation plants is stable, and enterprises are actively developing and improving the combined cycle waste heat boiler technology.
The addition of the afterburner at the inlet of the waste heat boiler is an effective means for improving the heat exchange efficiency of the waste heat boiler and increasing the power generation load of the power station. However, due to the limitation of the exhaust gas oxygen concentration of the gas turbine, some gas and oil fuels can not be fully combusted by the afterburner, so that unburnt loss is high, economic benefit is low, and even some fuels can not be used in an afterburner system of the waste heat boiler.
Disclosure of Invention
The invention aims to provide a post-combustion air system of a combined cycle waste heat boiler.
The above object is achieved by the following technical scheme:
the utility model provides a combined cycle exhaust-heat boiler afterburning wind system, its constitution includes: the afterburner is arranged at the inlet flue section of the waste heat boiler or at a position between heating surfaces according to the thermodynamic calculation result of the system, the burner is connected with the control cabinet, the afterburner is provided with a group of fuel inlet interfaces, a group of air supply interfaces and a compressed air interface, the fuel inlet interfaces are connected with a main gas fuel pipeline, the main gas fuel pipeline is connected with a group of compressed air pipelines and auxiliary gas pipelines, the compressed air pipelines are connected with an air compressor, the air supply interfaces are connected with an air supply pipeline, and the air supply pipeline is connected with an air blower.
And the compressed air pipeline is provided with a shut-off valve and an electric shut-off valve.
The combined cycle exhaust-heat boiler after-combustion air system, the gas fuel main pipeline on install shut-off valve, check valve, PCV valve, atmosphere exhaust pipe, the atmosphere exhaust pipe on install the PCV valve, be located compressed air pipeline, supplementary gas pipeline between the gas fuel main pipeline on install local manometer, remote manometer.
The auxiliary gas pipeline comprises an auxiliary gas main pipeline, the auxiliary gas main pipeline is connected with 2 auxiliary gas branch pipelines respectively, the auxiliary gas branch pipeline is connected with a fuel inlet interface, the auxiliary gas main pipeline is sequentially provided with a shut-off valve, a PCV valve, an electric shut-off valve, an on-site pressure gauge and a shut-off valve, and the auxiliary gas branch pipeline is provided with a regulating valve and a shut-off valve.
The air supply pipeline comprises an air supply main pipeline, the air supply main pipeline is connected with an air supply branch pipeline respectively, a shut-off valve is arranged on the air supply main pipeline, and a regulating valve and a shut-off valve are arranged on the air supply branch pipeline.
Advantageous effects
The burner of the waste heat boiler is additionally provided with the air supply bypass, and air is input to the nozzle of the afterburner through the air supply pipeline by the fan to assist fuel combustion. The air supplying system can increase the oxygen content of the exhaust gas of the gas turbine, so that the afterburner can burn high-heating-value gas and oil fuel. The adaptability of the afterburning system of the waste heat boiler to fuel selection is improved.
The invention regulates and controls the air supply quantity according to the fuel property and the afterburning load of the boiler. The air supply pipe opening is integrated on the afterburner, and is not required to be independently arranged on the flue of the waste heat furnace, so that the structure is simple and reliable. The simulation calculation is carried out aiming at engineering projects, the structure and the relative position of the air supply opening and the feeding opening of the burner are accurately arranged, and fuel gas and air can be mixed later, so that burning loss of the burner is effectively prevented.
The air supply system provided by the invention is simple and reliable, has strong applicability, can flexibly allocate the air supply proportion according to specific fuel properties to control combustion, and obviously improves the burner performance of the burner.
The invention expands the optional range of the fuel of the afterburner, can improve the combustion efficiency of the afterburner system of the waste heat furnace, the air supply system can control the mixing position of combustion air and fuel and control the form of a torch through the nozzle structure, protect the safety of the structures of the burner and the downstream heating surface, and can effectively regulate and control the combustion state of the fuel, control the discharge amount of NOx and improve the environmental protection index.
The burner of the invention is generally arranged at the inlet flue section of the waste heat boiler, and can be arranged at a position between heating surfaces according to the thermodynamic calculation result of the system. The burner is provided with a plurality of pipeline interfaces, the pipeline interfaces of the conventional burner are all fuel system pipelines, and the burner is provided with an air feeding interface point in the burner interface, so that air can be input into the burner through the interface to assist fuel to be fully combusted, the oxygen content in the furnace is improved, the fuel applicability is improved, and the combustion quality is enhanced. Meanwhile, the air feeding pipeline can adjust and control the air feeding quantity through the fan and the valve, so that the control of the burner is enhanced, and the operation requirements of all operation conditions are ensured.
The gas pipeline is provided with a shutoff valve, a pressure transmitter, a regulating valve, a filter, a pressure gauge, an electromagnetic valve, a pressure switch and a bleeding valve. The air pipeline is connected with an air supply fan and a burner air path interface, the air supply fan is arranged in auxiliary equipment room in a factory, and a shut-off valve and a regulating valve are arranged in the pipeline. The two pipelines are matched with fuel and air needed by combustion, so that the regulation and control requirements of different working conditions such as start-stop, regulation and control and the like in the operation of the boiler are ensured. The control cabinet comprises an emergency cut-off device, a power switch, a burner switch, an on-site reset system, a flame detection device, an ignition transformer and other main working modules, and the whole set of the control cabinet is connected to the DCS system of the factory to perform unified control and management.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
Description of the embodiments
Examples
The utility model provides a combined cycle exhaust-heat boiler afterburning wind system, its constitution includes: the afterburner 1 is arranged at an inlet flue section of the waste heat boiler or is arranged at a position between heating surfaces according to a system thermodynamic calculation result, the burner is connected with the control cabinet, the afterburner is provided with a group of fuel inlet interfaces, a group of air supply interfaces and a compressed air interface, the fuel inlet interfaces are connected with the main gas fuel pipeline 2, the main gas fuel pipeline is connected with the group of compressed air pipelines 3 and the auxiliary gas pipeline 4, the compressed air pipeline is connected with the air compressor 5, the air supply interfaces are connected with the air supply pipeline 6, and the air supply pipeline is connected with the air blower 7.
The nozzles of the afterburner are triangular, and the specific arrangement positions and the nozzle angles of the burners are designed through flow field simulation analysis in engineering, so that combustion air can be controlled by the system, the combustion area and the flame length can be controlled more accurately, and the burner nozzles of the burners and heating surfaces at the downstream of the burners can be protected. With conventional fuel, the flame length can be controlled within the range of 4.5 meters, the pressure drop caused by the burner is about 100Pa, and each burner can provide heat of 22 GJ/h. In addition, because the system can control the oxygen amount in the combustion process, the oxygen amount can be adjusted according to different working conditions, the generation amount of NOx in the combustion process can be effectively controlled, and under the condition of afterburning natural gas, the emission of NOx is lower than 48mg/MJ, so that the environmental protection index of the whole equipment is improved. The installation nozzle needs to be opened on the waste heat furnace body, the opening area is about 0.2 square meter of rectangle, and because the waste heat boiler inlet flue all has great space, the conventional waste heat furnace all has the space to arrange this combustor.
Examples
According to the after-combustion air system of the combined cycle waste heat boiler in the embodiment 1, a related shut-off valve 8 and an electric shut-off valve 9 are arranged on the compressed air pipeline.
Examples
According to the after-combustion air system of the combined cycle exhaust-heat boiler in the embodiment 1, a shutoff valve, a check valve 10, a PCV valve 11 and an atmosphere exhaust pipeline 12 are arranged on the main gas fuel pipeline, a PCV valve is arranged on the atmosphere exhaust pipeline, and a local pressure gauge 13 and a remote pressure gauge 14 are arranged on the main gas fuel pipeline between the compressed air pipeline and the auxiliary gas pipeline.
Examples
The after-combustion air system of the combined cycle exhaust-heat boiler according to embodiment 1 or 2, the auxiliary gas pipeline comprises an auxiliary gas main pipeline, the auxiliary gas main pipeline is connected with 2 auxiliary gas branch pipelines respectively, the auxiliary gas branch pipeline is connected with the fuel inlet port, the auxiliary gas main pipeline is sequentially provided with a shutoff valve, a PCV valve, an electric shutoff valve, an on-site pressure gauge and a shutoff valve, and the auxiliary gas branch pipeline is provided with a regulating valve 15 and a shutoff valve.
Examples
The after-combustion air system of the combined cycle exhaust-heat boiler according to embodiment 1 or 2, wherein the air supply pipeline comprises an air supply main pipeline, the air supply main pipeline is respectively connected with an air supply branch pipeline, a shut-off valve is arranged on the air supply main pipeline, and a regulating valve and a shut-off valve are arranged on the air supply branch pipeline.
Claims (4)
1. The utility model provides a combined cycle exhaust-heat boiler afterburning wind system, its constitution includes: the afterburner is characterized in that: the afterburner is arranged at an inlet flue section of the waste heat boiler or at a position between heating surfaces according to a system thermodynamic calculation result, the burner is connected with the control cabinet, the afterburner is provided with a group of fuel inlet interfaces, a group of air supply interfaces and a compressed air interface, the fuel inlet interfaces are connected with a main gas fuel pipeline, the main gas fuel pipeline is connected with a group of compressed air pipelines and auxiliary gas pipelines, the compressed air pipeline is connected with an air compressor, the air supply interfaces are connected with an air supply pipeline, and the air supply pipeline is connected with an air blower;
the gas fuel main pipeline on install shut-off valve, check valve, PCV valve, atmosphere exhaust pipeline, the atmosphere exhaust pipeline on install the PCV valve, be located compressed air pipeline, auxiliary gas pipeline between gas fuel main pipeline on install local manometer, remote manometer.
2. The combined cycle exhaust-heat boiler afterburner system of claim 1, wherein: and the compressed air pipeline is provided with a shutoff valve and an electric shutoff valve.
3. The combined cycle exhaust-heat boiler afterburner system of claim 2, wherein: the auxiliary gas pipeline comprises an auxiliary gas main pipeline, the auxiliary gas main pipeline is connected with 2 auxiliary gas branch pipelines respectively, the auxiliary gas branch pipelines are connected with the fuel inlet interface, the auxiliary gas main pipeline is sequentially provided with a shutoff valve, a PCV valve, an electric shutoff valve, an on-site pressure gauge and a shutoff valve, and the auxiliary gas branch pipeline is provided with a regulating valve and a shutoff valve.
4. The after-combustion air system of a combined cycle waste heat boiler according to claim 3, wherein: the air supply pipeline comprises an air supply main pipeline, the air supply main pipeline is connected with an air supply branch pipeline respectively, the air supply main pipeline is provided with a shut-off valve, and the air supply branch pipeline is provided with a regulating valve and a shut-off valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810933703.8A CN108954374B (en) | 2018-08-16 | 2018-08-16 | After-combustion air system of combined cycle waste heat boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810933703.8A CN108954374B (en) | 2018-08-16 | 2018-08-16 | After-combustion air system of combined cycle waste heat boiler |
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| CN108954374A CN108954374A (en) | 2018-12-07 |
| CN108954374B true CN108954374B (en) | 2023-05-30 |
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Citations (12)
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|---|---|---|---|---|
| US4116611A (en) * | 1976-09-01 | 1978-09-26 | Consolidated Natural Gas Service Company | Gaseous and liquid fuel burner |
| CN102538489A (en) * | 2011-12-31 | 2012-07-04 | 浙江西子联合工程有限公司 | Afterheat utilization flue after-burning device and after-burning method thereof |
| CN102563858A (en) * | 2012-01-13 | 2012-07-11 | 云南泛亚能源科技有限公司 | Complementary combustion device for low temperature waste heat power generation |
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| CN203349251U (en) * | 2013-06-05 | 2013-12-18 | 杭州海陆重工有限公司 | Afterburning system device of sintering waste-heat boiler |
| CN203586172U (en) * | 2013-10-17 | 2014-05-07 | 无锡东马锅炉科技有限公司 | After-burning furnace for sintering machine waste heat boiler |
| CN204200288U (en) * | 2014-11-05 | 2015-03-11 | 中国华能集团清洁能源技术研究院有限公司 | A kind of IGCC electric power station system with HRSG with Supplementary Firing |
| WO2015187064A2 (en) * | 2014-06-04 | 2015-12-10 | Фонд поддержки научной, научно-технической и инновационной деятельности "Энергия без границ" | Multi-mode combined cycle power plant |
| CN105221263A (en) * | 2015-09-18 | 2016-01-06 | 中国航空工业集团公司沈阳发动机设计研究所 | Cold Gas Turbine Combined-cycle system between one |
| CN107664046A (en) * | 2017-09-22 | 2018-02-06 | 中国华能集团公司 | A kind of energy-saving activation system in IGCC power stations |
| CN207455550U (en) * | 2017-09-28 | 2018-06-05 | 仟亿达集团股份有限公司 | Sintering exhaust-heat boiler afterburning stove |
| CN207515513U (en) * | 2017-09-28 | 2018-06-19 | 仟亿达集团股份有限公司 | Sintering exhaust-heat boiler afterburning stove |
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2018
- 2018-08-16 CN CN201810933703.8A patent/CN108954374B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4116611A (en) * | 1976-09-01 | 1978-09-26 | Consolidated Natural Gas Service Company | Gaseous and liquid fuel burner |
| CN102538489A (en) * | 2011-12-31 | 2012-07-04 | 浙江西子联合工程有限公司 | Afterheat utilization flue after-burning device and after-burning method thereof |
| CN102563858A (en) * | 2012-01-13 | 2012-07-11 | 云南泛亚能源科技有限公司 | Complementary combustion device for low temperature waste heat power generation |
| CN203010565U (en) * | 2012-12-04 | 2013-06-19 | 常州新奥燃气工程有限公司 | Waste heat-afterburning and no-waste heat parallel type steam production device |
| CN203349251U (en) * | 2013-06-05 | 2013-12-18 | 杭州海陆重工有限公司 | Afterburning system device of sintering waste-heat boiler |
| CN203586172U (en) * | 2013-10-17 | 2014-05-07 | 无锡东马锅炉科技有限公司 | After-burning furnace for sintering machine waste heat boiler |
| WO2015187064A2 (en) * | 2014-06-04 | 2015-12-10 | Фонд поддержки научной, научно-технической и инновационной деятельности "Энергия без границ" | Multi-mode combined cycle power plant |
| CN204200288U (en) * | 2014-11-05 | 2015-03-11 | 中国华能集团清洁能源技术研究院有限公司 | A kind of IGCC electric power station system with HRSG with Supplementary Firing |
| CN105221263A (en) * | 2015-09-18 | 2016-01-06 | 中国航空工业集团公司沈阳发动机设计研究所 | Cold Gas Turbine Combined-cycle system between one |
| CN107664046A (en) * | 2017-09-22 | 2018-02-06 | 中国华能集团公司 | A kind of energy-saving activation system in IGCC power stations |
| CN207455550U (en) * | 2017-09-28 | 2018-06-05 | 仟亿达集团股份有限公司 | Sintering exhaust-heat boiler afterburning stove |
| CN207515513U (en) * | 2017-09-28 | 2018-06-19 | 仟亿达集团股份有限公司 | Sintering exhaust-heat boiler afterburning stove |
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| CN108954374A (en) | 2018-12-07 |
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