CN111928237A - Mixed combustion nozzle based on mixed combustion chemical waste gas of circulating fluidized bed boiler and mixed combustion method - Google Patents

Mixed combustion nozzle based on mixed combustion chemical waste gas of circulating fluidized bed boiler and mixed combustion method Download PDF

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Publication number
CN111928237A
CN111928237A CN202010808006.7A CN202010808006A CN111928237A CN 111928237 A CN111928237 A CN 111928237A CN 202010808006 A CN202010808006 A CN 202010808006A CN 111928237 A CN111928237 A CN 111928237A
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CN
China
Prior art keywords
waste gas
mixed combustion
nozzle
secondary air
combustion
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Pending
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CN202010808006.7A
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Chinese (zh)
Inventor
何明月
孙向文
王君峰
王瑀
王德华
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Harbin Boiler Co Ltd
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Harbin Boiler Co Ltd
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Application filed by Harbin Boiler Co Ltd filed Critical Harbin Boiler Co Ltd
Priority to CN202010808006.7A priority Critical patent/CN111928237A/en
Publication of CN111928237A publication Critical patent/CN111928237A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00Fluidised bed combustion apparatus
    • F23C10/18Details; Accessories
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases

Abstract

A blending combustion nozzle and a blending combustion method based on blending combustion of chemical waste gas in a circulating fluidized bed boiler. The problems of poor low-load oil-free stable combustion capability of a boiler, serious slag bonding of a hearth and serious high-temperature corrosion of a water-cooled wall during high-load operation of the boiler exist in the existing in-service unit, and the deep peak regulation capability of a thermal power unit is directly influenced. The invention comprises the following components: main burners installed at four corners of boiler furnace, the central axis of main burner and water-cooled wall of furnace form included angleαThe main burner comprises a plurality of groups of secondary air nozzles and primary air nozzles which are arranged at intervals. The invention relates to a blending combustion nozzle and a blending combustion method based on blending combustion chemical waste gas of a circulating fluidized bed boiler.

Description

Mixed combustion nozzle based on mixed combustion chemical waste gas of circulating fluidized bed boiler and mixed combustion method
The technical field is as follows:
the invention relates to a blending combustion nozzle and a blending combustion method based on blending combustion chemical waste gas of a circulating fluidized bed boiler.
Background art:
the synthetic ammonia device of the general chemical industry has 2 paths of low-pressure fuel gas, and in the actual production, the heat value of the low-pressure fuel gas is relatively low, so that the requirement of the operation process cannot be met, and the fuel gas is discharged to a fuel gas main pipe or is discharged to an accident torch for burning as waste gas for a long time, so that a large amount of fuel gas is wasted and the environment is polluted. And chemical industry can produce multiple complicated waste gases in the production process, can not directly discharge, and can cause environmental pollution.
The circulating fluidized bed boiler adopts a fluidized combustion mode, a large amount of bed materials (ash and coal mixture) exist in the boiler, the bed materials are in a fluidized state under the action of primary air and secondary air of the boiler, and internal circulation inside a hearth and external circulation outside the boiler are realized. Under the condition of strong particle back mixing, the circulating fluidized bed boiler can continuously and circularly burn in a reciprocating mode, so that various inferior fuels can be burnt in the circulating fluidized bed boiler due to the own burning characteristic of the circulating fluidized bed boiler. The circulating fluidized bed boiler has low concentration of original NOx due to a circulating fluidized combustion mode, can adopt low-cost in-furnace desulfurization, and SCR and SNCR denitration technologies to meet the requirement of ultra-clean emission of the environment, and is the best choice for clean and efficient treatment of chemical waste gas.
The invention content is as follows:
the invention aims to provide a blending combustion nozzle and a blending combustion method based on blending combustion chemical waste gas of a circulating fluidized bed boiler.
The above purpose is realized by the following technical scheme:
a mixed combustion nozzle based on mixed combustion of chemical waste gas in a circulating fluidized bed boiler comprises a secondary air pipe in a dense-phase region layering manner of the boiler, wherein a mixed combustion spray pipe and the secondary air pipe form a sleeve structure, and the mixed combustion spray pipe is a Venturi pipe structure provided with a plurality of negative pressure suction small holes;
and an annular gap between the mixed combustion nozzle and the secondary air pipe is a channel of secondary air.
The quantity of the negative pressure suction small holes is 4 based on the mixed combustion nozzle of the circulating fluidized bed boiler mixed combustion chemical waste gas.
A mixed combustion method of mixed combustion nozzle based on mixed combustion chemical waste gas of circulating fluidized bed boiler, the mixed combustion waste gas is fed in layer by layer in the dense phase zone of circulating fluidized bed, and fed in from the secondary air inlet of the dense phase zone of the boiler, the mixed combustion nozzle and the secondary air pipe form a sleeve structure, the annular gap is the channel of the secondary air, the secondary air is used as the cooling air of the mixed combustion waste gas nozzle, the mixed combustion nozzle can stably run in high temperature environment for a long time, when the mixed combustion waste gas passes through the nozzle at high speed, a Venturi effect is formed in a negative pressure area of the nozzle which is specially designed, secondary air is sucked in through the small hole for premixing, simultaneously, the pressure difference between waste gas and the hearth is large, the fire is easily removed at the position of the waste gas nozzle, the dispersed combustion under the disturbance of secondary air is realized while the nozzle is protected, when the exhaust gas is stopped, the pressure of the nozzle is reduced, and the secondary air can enter the exhaust gas pipeline from the small hole of the negative pressure suction inlet to automatically purge the exhaust gas pipeline.
Has the advantages that:
1. after the mixed combustion nozzle utilizes the chemical waste gas mixed combustion of the circulating fluidized bed boiler, the mixed combustion nozzle is beneficial to ensuring the long-term and stable operation of the mixed combustion nozzle, and is effectively utilized as the fuel discharged by the waste gas for a long time.
The mixed combustion nozzle and the secondary air pipe form a sleeve structure, and the secondary air is used as cooling air, so that the mixed combustion nozzle can stably operate in a high-temperature environment for a long time; the mixed burning nozzle adopts the structural design of a Venturi tube, and the generated negative pressure region is premixed with secondary air through a small hole structure so as to prevent the phenomena of tempering and fire dropping; when the waste gas is stopped, secondary air enters the waste gas pipeline from the small hole of the negative pressure suction inlet to automatically purge the waste gas pipeline, and the safe operation of the system is ensured.
Description of the drawings:
FIG. 1 is a schematic structural view of a layered mixed combustion nozzle in a dense phase zone of a boiler according to the present invention;
FIG. 2 is a schematic structural view of the mixing combustion nozzle and the secondary air pipe;
FIG. 3 is a schematic structural view of a boiler;
in the figure: 1. a combustion nozzle; 2. a secondary air duct; 3. a dense-phase region of the hearth; 4. a small pore structure; 5. a wind distribution plate; 6. a hearth; 7. a separator; 8. a tail flue; 9. tubular air preheater.
The specific implementation mode is as follows:
example 1:
a mixed combustion nozzle based on mixed combustion of chemical waste gas in a circulating fluidized bed boiler comprises a secondary air pipe 2 of a dense-phase zone 3 of the boiler, a mixed combustion spray pipe 1 and the secondary air pipe are arranged in the secondary air pipe to form a sleeve structure, and the mixed combustion spray pipe is a Venturi pipe structure provided with a plurality of negative pressure suction small holes 4;
and an annular gap between the mixed combustion nozzle and the secondary air pipe is a channel of secondary air.
Example 2:
according to the mixed combustion nozzle for mixed combustion of chemical waste gas based on the circulating fluidized bed boiler in the embodiment 1, the number of the negative pressure suction small holes is 4.
Example 3:
a method for carrying out co-combustion by utilizing the position of the co-combustion nozzle based on the co-combustion chemical waste gas of the circulating fluidized bed boiler in the embodiment 1-2 is characterized in that the co-combustion waste gas is fed in layer by layer in a dense phase region of the circulating fluidized bed and is fed from a secondary air port in the dense phase region of the boiler, a co-combustion spray pipe and a secondary air pipe form a sleeve structure, an annular gap is a channel of secondary air, the secondary air is simultaneously used as cooling air of the nozzle of the co-combustion waste gas, so that the co-combustion nozzle can stably operate in a high-temperature environment for a long time, and when the co-combustion waste gas, a Venturi effect is formed in a negative pressure area of the nozzle which is specially designed, secondary air is sucked in through the small hole for premixing, simultaneously, the pressure difference between waste gas and the hearth is large, the fire is easily removed at the position of the waste gas nozzle, the dispersed combustion under the disturbance of secondary air is realized while the nozzle is protected, when the exhaust gas is stopped, the pressure of the nozzle is reduced, and the secondary air can enter the exhaust gas pipeline from the small hole of the negative pressure suction inlet to automatically purge the exhaust gas pipeline.
The circulating fluidized bed boiler consists of a hearth 6, a separator 7 and a tail flue 8. The heat is released by burning the coal in the hearth, the separator returns the materials to form circulation, and the tail flue is heated by the surface for heat exchange. Air enters a tubular air preheater 9 for heating, and a part of the air enters a water-cooled air chamber at the bottom of the hearth through a primary air duct and enters the hearth through an air distribution plate 5; one part enters the furnace chamber conical section through the secondary air duct and enters the furnace chamber in two layers. The air entering the hearth and the flue gas generated by the combustion of the coal fed by the front wall sequentially pass through the hearth, the separator and the tail flue, and are discharged out of the boiler after heat exchange.
The mixed combustion mode is that the waste gas is fed into a hearth for combustion after the boiler is stably combusted. The temperature of the hearth of the boiler after stable combustion is higher than about 900 ℃, which is an advantageous condition for the full combustion of chemical waste gas. The low-cost in-furnace desulfurization and SCR/SNCR denitration of the circulating fluidized bed can enable the chemical waste gas with higher pollutant content to meet the national ultra-clean environmental emission standard, and realize high-efficiency clean utilization.
The mixed combustion exhaust gas is fed in layer by layer in the dense phase region of the circulating fluidized bed and is fed in from a secondary air port in the dense phase region of the boiler, the mixed combustion nozzle and a secondary air pipe form a sleeve structure, an annular gap is a channel of secondary air, and the secondary air is used as cooling air of the mixed combustion exhaust gas nozzle, so that the mixed combustion nozzle can stably operate in a high-temperature environment for a long time. When the mixed combustion waste gas passes through the nozzle at high speed, a Venturi effect is formed in a negative pressure area of the nozzle which is specially designed, secondary air is sucked through the small holes for premixing, and the tempering phenomenon can be prevented; meanwhile, the pressure difference between the waste gas and the hearth is large, the fire is easily removed from the position of the waste gas nozzle, and the dispersed combustion under the disturbance of secondary air is realized while the nozzle is protected. When the exhaust gas stops, the pressure of the nozzle is reduced, and secondary air can enter the exhaust gas pipeline from the small hole of the negative pressure suction inlet to automatically purge the exhaust gas pipeline, so that the safe operation of the system is ensured.

Claims (3)

1. A mix and burn spout based on chemical waste gas is burnt in circulating fluidized bed boiler mixes, characterized by: the mixed combustion nozzle based on mixed combustion chemical waste gas of the circulating fluidized bed boiler comprises a secondary air pipe layered in a dense-phase region of the boiler, a mixed combustion spray pipe and the secondary air pipe are arranged in the secondary air pipe to form a sleeve structure, and the mixed combustion spray pipe is a Venturi pipe structure provided with a plurality of negative pressure suction small holes; and an annular gap between the mixed combustion nozzle and the secondary air pipe is a channel of secondary air.
2. The co-combustion nozzle based on the chemical waste gas of the circulating fluidized bed boiler in co-combustion as claimed in claim 1, wherein: the number of the negative pressure suction small holes is 4.
3. A co-combustion method at the position of the co-combustion nozzle based on the chemical waste gas co-combustion of the circulating fluidized bed boiler as claimed in any one of claims 1 to 2, which is characterized in that: the mixed combustion waste gas is fed in layer by layer in a dense phase area of a circulating fluidized bed, the mixed combustion spray pipe and a secondary air pipe form a sleeve structure, an annular gap is a channel of secondary air, the secondary air is simultaneously used as cooling air of a mixed combustion waste gas nozzle, so that the mixed combustion nozzle can stably run in a high-temperature environment for a long time, when the mixed combustion waste gas passes through the nozzle at a high speed, a Venturi effect is formed in a negative pressure area of the nozzle specially designed, the secondary air is sucked in through small holes for premixing, simultaneously, the pressure difference between the waste gas and a hearth is large, a fire removing phenomenon is easily formed at the waste gas nozzle, the dispersed combustion under the disturbance of the secondary air is realized while the nozzle is protected, when the waste gas is stopped, the pressure of the nozzle is reduced, and the secondary air can enter the waste gas pipe line from the small holes of a negative pressure suction inlet.
CN202010808006.7A 2020-08-12 2020-08-12 Mixed combustion nozzle based on mixed combustion chemical waste gas of circulating fluidized bed boiler and mixed combustion method Pending CN111928237A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112628707A (en) * 2020-12-25 2021-04-09 东方电气集团东方锅炉股份有限公司 Circulating fluidized bed boiler giving consideration to both coal-fired and gas-fired mixed combustion and control method
CN113188118A (en) * 2021-04-09 2021-07-30 东方电气集团东方锅炉股份有限公司 Equipment and method for bulk blending combustion of industrial tail gas in circulating fluidized bed boiler
CN113757649A (en) * 2021-09-16 2021-12-07 东方电气集团东方锅炉股份有限公司 1000 MW-grade ultra-supercritical circulating fluidized bed boiler
CN115854336A (en) * 2022-10-14 2023-03-28 中国石油天然气股份有限公司 Method and device for fuel blending combustion fireflood flue gas of circulating fluidized bed boiler

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112628707A (en) * 2020-12-25 2021-04-09 东方电气集团东方锅炉股份有限公司 Circulating fluidized bed boiler giving consideration to both coal-fired and gas-fired mixed combustion and control method
CN113188118A (en) * 2021-04-09 2021-07-30 东方电气集团东方锅炉股份有限公司 Equipment and method for bulk blending combustion of industrial tail gas in circulating fluidized bed boiler
CN113757649A (en) * 2021-09-16 2021-12-07 东方电气集团东方锅炉股份有限公司 1000 MW-grade ultra-supercritical circulating fluidized bed boiler
CN115854336A (en) * 2022-10-14 2023-03-28 中国石油天然气股份有限公司 Method and device for fuel blending combustion fireflood flue gas of circulating fluidized bed boiler
CN115854336B (en) * 2022-10-14 2023-09-15 中国石油天然气股份有限公司 Method and device for mixing fuel of circulating fluidized bed boiler with fire-driving flue gas

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