CN108518666B - Pulverized coal boiler stable combustion system and method using coal as fuel - Google Patents
Pulverized coal boiler stable combustion system and method using coal as fuel Download PDFInfo
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- CN108518666B CN108518666B CN201810285027.8A CN201810285027A CN108518666B CN 108518666 B CN108518666 B CN 108518666B CN 201810285027 A CN201810285027 A CN 201810285027A CN 108518666 B CN108518666 B CN 108518666B
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- 239000003245 coal Substances 0.000 title claims abstract description 113
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 35
- 239000000446 fuel Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000012528 membrane Substances 0.000 claims abstract description 29
- 239000002893 slag Substances 0.000 claims abstract description 26
- 238000002309 gasification Methods 0.000 claims abstract description 24
- 239000002699 waste material Substances 0.000 claims abstract description 14
- 238000009841 combustion method Methods 0.000 claims abstract description 10
- 230000005855 radiation Effects 0.000 claims abstract description 10
- 239000000498 cooling water Substances 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 42
- 239000002245 particle Substances 0.000 claims description 26
- 239000002956 ash Substances 0.000 claims description 24
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 22
- 239000003546 flue gas Substances 0.000 claims description 22
- 239000003034 coal gas Substances 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 10
- 239000010883 coal ash Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000000197 pyrolysis Methods 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000002817 coal dust Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/74—Construction of shells or jackets
- C10J3/76—Water jackets; Steam boiler-jackets
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/86—Other features combined with waste-heat boilers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0956—Air or oxygen enriched air
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1603—Integration of gasification processes with another plant or parts within the plant with gas treatment
- C10J2300/1606—Combustion processes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1625—Integration of gasification processes with another plant or parts within the plant with solids treatment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
The invention relates to a stable combustion system and a stable combustion method for a pulverized coal boiler using coal as fuel, wherein the stable combustion system for the pulverized coal boiler using coal as fuel comprises a gasifier body, a pulverized coal boiler and a first steam drum, wherein a gasification section, a radiation waste boiler section and a slag pool section which are connected with each other are sequentially arranged in the gasifier body from top to bottom, and the slag pool section is connected with a slag discharge pipeline; the pulverized coal boiler comprises a boiler body, a plurality of stable gas burners and a plurality of pulverized coal burners, wherein a first membrane water wall is arranged on the boiler body, each stable gas burner and each pulverized coal burner are respectively connected with the boiler body, a gas outlet of the radiation waste boiler section is connected with the stable gas burners through stable gas pipelines, and the first membrane water wall is respectively connected with a first steam bag through a first cooling water pipeline and a first steam pipeline. The stable combustion system of the pulverized coal boiler taking coal as fuel has low-load operation and deep peak regulation capability, and can meet the requirement of maintaining the long-time low-load operation of the pulverized coal boiler with low cost.
Description
Technical Field
The invention relates to the technical field of stable combustion of power station boiler combustion, in particular to a stable combustion system and a stable combustion method of a pulverized coal boiler using coal as fuel.
Background
In order to ensure stable combustion of a boiler, fuel oil is generally required to be added for supporting combustion and stabilizing combustion in the cold start and low-load operation processes of coal-fired units. It is reported that the annual fuel consumption of coal-fired power plants in China is up to about 1800 ten thousand tons, which is equivalent to about 1000 hundred million yuan.
In recent years, renewable energy sources such as wind power and photovoltaic in China are rapidly developed, however, renewable energy sources such as wind power and photovoltaic have instability, wind power and photovoltaic power generation surfing can impact a power grid, and a coal-fired unit is generally required to cooperate with peak regulation, so that higher requirements are put forward on the operation flexibility and the peak regulation capacity of the coal-fired unit, and particularly on the low-load operation capacity. On the other hand, in recent years, the utilization hours of the coal-fired units in China are continuously reduced, the utilization hours of the coal-fired units in 2017 are reduced to about 4000 hours, the coal-fired units are in a low-load operation state for a long time, the fuel consumption for stable combustion is large, and the operation cost is increased when the long-time low-load operation is maintained.
Disclosure of Invention
The invention aims to provide a stable combustion system and a stable combustion method for a pulverized coal boiler using coal as fuel, which are used for solving the defects of high fuel consumption and high operation cost when the existing coal-fired machine is in a low-load operation state.
In order to achieve the above purpose, the invention provides a pulverized coal boiler steady burning system using coal as fuel, which comprises a gasification furnace body, a pulverized coal boiler and a first steam ladle, wherein a gasification section, a radiation waste boiler section and a slag pool section which are connected with each other are sequentially arranged in the gasification furnace body from top to bottom, and the slag pool section is connected with a slag discharge pipeline; the pulverized coal boiler comprises a boiler body, a plurality of stable gas burners and a plurality of pulverized coal burners, wherein a first membrane type water-cooled wall is arranged on the boiler body, each stable gas burner and each pulverized coal burner are respectively connected with the boiler body, a gas outlet of a radiation waste boiler section is connected with the stable gas burners through stable gas pipelines, and the first membrane type water-cooled wall is respectively connected with a first steam bag through a first cooling water pipeline and a first steam pipeline.
Preferably, the pulverized coal boiler stable combustion system using coal as fuel further comprises a second steam drum, a second membrane water-cooled wall is arranged in the radiation waste boiler section, and the second membrane water-cooled wall is connected with the second steam drum through a second cooling water pipeline and a second steam pipeline.
Preferably, the plurality of stable gas burners and the plurality of pulverized coal burners are alternately arranged on the periphery of the boiler body and are respectively connected with the boiler body.
Preferably, the steam outlet of the first steam drum is connected and converged with the steam outlet of the second steam drum.
Preferably, a feeding nozzle connected with the gasification section is arranged at the top of the gasification furnace body.
Preferably, the lower part of the boiler body is provided with an air inlet, and the upper part of the boiler body is provided with a flue gas outlet.
Correspondingly, the invention also provides a stable combustion method of the pulverized coal boiler using coal as fuel, which comprises the following steps:
step a1, inputting pulverized coal and a gasifying agent into the gasification section, wherein the pulverized coal and the gasifying agent are subjected to pyrolysis and gasification reaction in a high-temperature environment to generate coal gas and ash particles, the coal gas and part of the ash particles enter the stable gas burner through the stable gas pipe, and the other part of the ash particles fall into the slag pool section and are discharged out of the slag pool section through the slag discharge pipe;
step a2, the coal gas and the ash particles are subjected to combustion reaction in the stable gas burner to establish a stable ignition heat source;
step a3, respectively inputting pulverized coal and air into the boiler body, burning coal gas, pulverized coal and ash particles to generate high-temperature flue gas, performing heat exchange between the high-temperature flue gas and circulating water in a first membrane water wall in the boiler body, discharging the high-temperature flue gas with reduced temperature from a flue gas outlet, and introducing water vapor generated in the first membrane water wall into a first steam bag to perform steam-water separation to obtain first saturated water vapor.
Preferably, the following steps are performed simultaneously with step a 1: and introducing the water vapor generated in the second membrane water wall into the second steam drum to perform steam-water separation to obtain second saturated water vapor, wherein the first steam drum and the second steam drum adopt the same operating pressure, and the first saturated water vapor and the second saturated water vapor are mixed and then used for subsequent utilization, so that the yield of the steam of the pulverized coal boiler can be improved.
Preferably, the gasifying agent is air.
The invention has the following advantages: the stable combustion system of the pulverized coal boiler taking coal as fuel has low-load operation and deep peak regulation capability, and can meet the requirement of maintaining the long-time low-load operation of the pulverized coal boiler with low cost.
Drawings
Fig. 1 is a schematic diagram of a stable combustion system of a pulverized coal boiler using coal as fuel.
Fig. 2 is a flow chart of the stable combustion method of the pulverized coal boiler using coal as fuel.
Detailed Description
The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
As shown in fig. 1, the pulverized coal boiler steady combustion system using coal as fuel comprises a gasification furnace body 1, a pulverized coal boiler 2 and a first steam ladle 25, wherein a gasification section 12, a radiation waste boiler section 13 and a slag pool section 14 which are connected with each other are sequentially arranged in the gasification furnace body 1 from top to bottom, the bottom of the slag pool section 14 is connected with a slag discharge pipeline, part of ash particles after pulverized coal combustion can be discharged through the slag discharge pipeline, a feeding nozzle 11 is arranged at the top of the gasification furnace body 1, the feeding nozzle 11 is connected with the gasification section 12, the feeding nozzle 11 is used for receiving first pulverized coal and gasifying agent feed, the first pulverized coal is pulverized coal conveyed by nitrogen, the gasifying agent is air, and a coal gas outlet port 132 is arranged at the lower part of the radiation waste boiler section 13.
The pulverized coal boiler 2 comprises a boiler body 21, a plurality of stable gas burners 22 and a plurality of pulverized coal burners 23, wherein a first membrane water wall 211 is arranged on the boiler body 21, the first membrane water wall 211 is used for absorbing heat carried by high-temperature flue gas and generating steam, the first membrane water wall 211 is connected with a first steam drum 25 through a first cooling water pipeline 27 and a first steam pipeline 28 respectively, and steam input into the first steam drum 25 is subjected to steam-water separation through the first steam drum 25 to obtain first saturated steam. The plurality of steady gas burners 22 and the plurality of pulverized coal burners 23 are respectively arranged on the periphery of the boiler body 21, each steady gas burner 22 and each pulverized coal burner 23 are respectively connected with the boiler body 21, the preference is that the plurality of steady gas burners 22 and the plurality of pulverized coal burners 23 are arranged on the periphery of the boiler body 21 in a staggered way and are respectively connected with the boiler body 21, the ignition and combustion stability of the pulverized coal burners 23 can be ensured through the staggered arrangement of the steady gas burners 22 and the pulverized coal burners 23, the combustion efficiency of the boiler body 21 is improved, and the gas outlet of the radiation waste boiler section 13 is connected with the steady gas burners 22 through the 132 steady gas pipeline 16. The lower part of the boiler body 21 is provided with an air inlet 212, and the upper part of the boiler body 21 is provided with a flue gas outlet 213. The pulverized coal burner 23 is used for receiving a secondary pulverized coal feed, the secondary pulverized coal is conveyed by air, the air inlet 212 is used for inputting air as a secondary air inlet of the boiler body 21, and the flue gas outlet 213 is used for discharging flue gas generated inside the boiler body 21.
Further, in order to increase the steam yield of the pulverized coal boiler 2, in an embodiment of the invention, the pulverized coal boiler 2 stable combustion system using coal as fuel further comprises a second steam drum 15, a second membrane water wall 131 is disposed inside the radiant waste boiler section 13, the second membrane water wall 131 is used for absorbing heat generated by the first pulverized coal and the gasifying agent in the gasifier body 1 and generating steam, and the second membrane water wall 131 is connected with the second steam drum 15 through a second cooling water pipeline 17 and a second steam pipeline 18. The steam input into the second steam drum 15 is subjected to steam-water separation by the second steam drum 15 to obtain second saturated steam. Further, the steam outlet of the first steam drum 25 is connected and combined with the steam outlet of the second steam drum 15.
Working principle:
the first pulverized coal and gasifying agent enter the gasification section 12 through the feeding nozzle 11, and are subjected to pyrolysis and gasification reaction in a high-temperature environment to generate coal gas and ash particles, wherein the internal pressure of the gasification furnace body 1 is slightly higher than that of the boiler body 21. The gas and ash particles flow out of the gasification stage 12 and then enter the radiant waste boiler stage 13, and the gas and ash particles undergo heat exchange with the circulating water in the second membrane water wall 131 in the radiant waste boiler stage 13, and the temperature of the gas and ash particles drops. The gas and a portion of the ash particles, which are predominantly fine ash, flow out through the gas outlet and into the steady gas burner 22 through the steady gas line 16. The other part of ash particles directly fall into the slag bath section 14 and are discharged through a slag discharge pipeline, and the ash particles falling into the slag bath section 14 are mainly lump slag. The gas is burnt in the steady gas burner 22 and emits a large amount of heat, a steady ignition heat source is established, and the ignition and combustion stability of the pulverized coal burner 23 are ensured. Ash particles mainly comprising fine ash are further burnt out in the stable gas burner 22, so that the combustion efficiency of the boiler body 21 is improved. The combustion of the coal gas, the coal powder and the ash particles mainly comprising fine ash generates high-temperature flue gas, the high-temperature flue gas exchanges heat with the circulating water in the first membrane water wall 211, and the flue gas with reduced temperature is discharged from a flue gas outlet 213 in the boiler body 21. The steam generated in the first membrane water wall 211 is led into the first steam drum 25 to be subjected to steam-water separation to obtain first saturated steam, the steam generated in the second membrane water wall 131 is led into the second steam drum 15 to be subjected to steam-water separation to obtain second saturated steam, the first steam drum 25 and the second steam drum 15 adopt the same operating pressure, and the first saturated steam and the second saturated steam are mixed and then are used for subsequent utilization, so that the steam yield of the pulverized coal boiler 2 can be improved.
As shown in fig. 2, the invention further provides a stable combustion method of the pulverized coal boiler 2 using coal as fuel, and the stable combustion method of the pulverized coal boiler 2 using coal as fuel comprises the following steps:
step a1, inputting pulverized coal and gasifying agent into a gasification section 12, generating coal gas and ash particles by pyrolysis and gasification reaction of the pulverized coal and gasifying agent in a high-temperature environment, enabling the coal gas and part of ash particles to enter a stable gas burner 22 through a stable gas pipeline 16, enabling the other part of ash particles to fall into a slag pool section 14, and discharging the slag pool section 14 through a slag discharge pipeline;
the pulverized coal entering the gasification section 12 is the first pulverized coal conveyed by nitrogen, and the gasifying agent is air.
Step a2, the coal gas and ash particles are subjected to combustion reaction in the stable gas burner 22 to establish a stable ignition heat source;
the gas is burnt in the steady gas burner 22 and emits a large amount of heat, a steady ignition heat source is established, and the ignition and combustion stability of the pulverized coal burner 23 are ensured. Ash particles mainly comprising fine ash are further burnt out in the stable gas burner 22, so that the combustion efficiency of the boiler body 21 is improved.
In step a3, coal dust and air are respectively input into the boiler body 21, high-temperature flue gas is generated by burning coal dust, coal dust and ash particles, the high-temperature flue gas exchanges heat with circulating water in the first membrane water wall 211 in the boiler body 21, the high-temperature flue gas with reduced temperature is discharged from the flue gas outlet 213, and steam generated in the first membrane water wall 211 is led into the first steam drum 25 for steam-water separation to obtain first saturated steam.
Wherein pulverized coal and a part of air are introduced into the interior of the boiler body 21 from the pulverized coal burner 23, and another part of air is introduced through the air inlet 212, where pulverized coal is the above-mentioned second pulverized coal transported by air.
Further, in order to increase the steam yield of the pulverized coal boiler 2, the following steps are performed while the step a1 is performed: the steam generated in the second membrane water wall 131 is led into the second steam drum 15 to be subjected to steam-water separation to obtain second saturated steam, the first steam drum 25 and the second steam drum 15 adopt the same operating pressure, and the first saturated steam and the second saturated steam are mixed and then used for subsequent utilization, so that the steam yield of the pulverized coal boiler 2 can be improved.
The stable combustion system and the method for the pulverized coal boiler 2 using coal as fuel, disclosed by the invention, have the advantages that the coal powder with lower price is used as the fuel to produce the coal gas for stable combustion of the pulverized coal boiler 2, the operation cost can be reduced by 70% compared with that of the fuel stable combustion system and method, and the requirements of long-time low-load operation of the pulverized coal boiler 2 can be met due to the lower operation cost, so that the requirements of peak shaving and low-load operation of a coal-fired unit can be met.
While the invention has been described in detail in the foregoing general description and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (8)
1. The stable combustion system of the pulverized coal boiler taking coal as fuel comprises a gasifier body, the pulverized coal boiler and a first steam drum, and is characterized in that a gasification section, a radiation waste boiler section and a slag pool section which are connected with each other are sequentially arranged in the gasifier body from top to bottom, and the slag pool section is connected with a slag discharge pipeline; the pulverized coal boiler comprises a boiler body, a plurality of stable gas burners and a plurality of pulverized coal burners, wherein a first membrane type water-cooled wall is arranged on the boiler body, each stable gas burner and each pulverized coal burner are respectively connected with the boiler body, a gas outlet of the radiation waste boiler section is connected with the stable gas burners through stable gas pipelines, and the first membrane type water-cooled wall is respectively connected with a first steam packet through a first cooling water pipeline and a first steam pipeline; the stable gas burners and the pulverized coal burners are alternately arranged on the periphery of the boiler body and are respectively connected with the boiler body.
2. The coal-fueled pulverized coal boiler steady burning system according to claim 1, further comprising a second steam drum, wherein a second membrane water wall is provided inside the radiant waste boiler section, and wherein the second membrane water wall is connected to the second steam drum through a second cooling water line and a second steam line.
3. The coal-fueled pulverized coal boiler stabilizing system according to claim 2, wherein the steam outlet of the first steam drum is connected to and merges with the steam outlet of the second steam drum.
4. A pulverized coal boiler steady burning system using coal as fuel as claimed in claim 3, characterized in that the top of the gasifier body is provided with a feed nozzle connected with the gasification section.
5. The stable combustion system of a pulverized coal fired boiler using coal as fuel according to claim 4, wherein the lower part of the boiler body is provided with an air inlet, and the upper part of the boiler body is provided with a flue gas outlet.
6. A stable combustion method of a pulverized coal boiler using coal as fuel, which is characterized in that the stable combustion method of the pulverized coal boiler using coal as fuel is based on the stable combustion system of the pulverized coal boiler using coal as fuel of any one of claims 1 to 5; the method comprises the following steps:
step a1, inputting pulverized coal and a gasifying agent into the gasification section, wherein the pulverized coal and the gasifying agent are subjected to pyrolysis and gasification reaction in a high-temperature environment to generate coal gas and ash particles, the coal gas and part of the ash particles enter the stable gas burner through the stable gas pipe, and the other part of the ash particles fall into the slag pool section and are discharged out of the slag pool section through the slag discharge pipe;
step a2, the coal gas and the ash particles are subjected to combustion reaction in the stable gas burner to establish a stable ignition heat source;
step a3, respectively inputting pulverized coal and air into the boiler body, burning coal gas, pulverized coal and ash particles to generate high-temperature flue gas, performing heat exchange between the high-temperature flue gas and circulating water in a first membrane water wall in the boiler body, discharging the high-temperature flue gas with reduced temperature from a flue gas outlet, and introducing water vapor generated in the first membrane water wall into a first steam bag to perform steam-water separation to obtain first saturated water vapor.
7. The stable combustion method of a pulverized coal fired boiler according to claim 6, characterized in that the following steps are performed simultaneously with the step a 1: and introducing the water vapor generated in the second membrane water wall into the second steam drum to perform steam-water separation to obtain second saturated water vapor, wherein the first steam drum and the second steam drum adopt the same operating pressure, and the first saturated water vapor and the second saturated water vapor are mixed and then used for subsequent utilization, so that the yield of the steam of the pulverized coal boiler can be improved.
8. The method of stabilizing a pulverized coal fired boiler according to claim 7, wherein the gasifying agent is air.
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| CN201810285027.8A CN108518666B (en) | 2018-04-02 | 2018-04-02 | Pulverized coal boiler stable combustion system and method using coal as fuel |
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| CN201810285027.8A CN108518666B (en) | 2018-04-02 | 2018-04-02 | Pulverized coal boiler stable combustion system and method using coal as fuel |
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| CN108518666B true CN108518666B (en) | 2024-04-12 |
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